|Year : 2018 | Volume
| Issue : 5 | Page : 569-595
Nature's bountiful gift to humankind: Vegetables & fruits & their role in cardiovascular disease & diabetes
Kamala Krishnaswamy1, Rajagopal Gayathri2
1 ICMR-National Institute of Nutrition, Hyderabad, India
2 Department of Foods Nutrition & Dietetics Research, Madras Diabetes Research Foundation, Chennai, India
|Date of Submission||24-Sep-2018|
|Date of Web Publication||21-Jan-2019|
Dr Kamala Krishnaswamy
House No. 1-2-98/2, Sriniketan, Kakateeyanagar Colony, Habsiguda, Hyderabad 500 007, Telangana
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Fruits and vegetables (FVs) are recognized as healthy constituents of diet and a sustainable solution to the existing twin burden of micronutrient deficiencies and non-communicable diseases in developing and developed countries. In general, FVs are nutrient dense foods low in energy, containing varying amounts of vitamins and minerals including carotenoids, B vitamins, vitamin C, iron, zinc, potassium, calcium, magnesium and fibre. These are abundantly rich in phytochemicals that function as antioxidants, anti-atherosclerotic and anti-inflammatory agents. This review summarizes some epidemiological, prospective cohort and intervention studies on the health benefits of FVs in relation to cardiovascular disease, obesity and diabetes. The rich varieties of FVs available, their composition, production scenario in India, dietary intake and trends over time, barriers to sufficient intake mainly sociocultural, economic and horticulture environment, policies for promotion and prevention of diseases are considered.
Keywords: Cardiovascular disease - diabetes - fruits and vegetables - micronutrients - obesity - phytonutrients
|How to cite this article:|
Krishnaswamy K, Gayathri R. Nature's bountiful gift to humankind: Vegetables & fruits & their role in cardiovascular disease & diabetes. Indian J Med Res 2018;148:569-95
|How to cite this URL:|
Krishnaswamy K, Gayathri R. Nature's bountiful gift to humankind: Vegetables & fruits & their role in cardiovascular disease & diabetes. Indian J Med Res [serial online] 2018 [cited 2020 Jul 16];148:569-95. Available from: http://www.ijmr.org.in/text.asp?2018/148/5/569/249981
Kamala Krishnaswamy - Former Director
| Introduction|| |
Worldwide, today defiant chronic health issues covering a wide spectrum of diseases are encountered. The developing countries, in addition, have to confront the existing nutritional deficiency disorders, particularly micronutrient deficiencies that are extensive in the population with undesirable consequences. Dietary guidelines of several countries suggest that plant food, especially fruits and vegetable (FVs) rich in micro/phytonutrients and the much-needed fibre, are the basis for health and wellness of all age groups and prevent several disorders. These power-packed nutrient dense colourful foods are low in calories and rich in nutrients/non-nutrients, which synergistically participate in modifying pathophysiological and metabolic aspects of diseases. These are the much-wanted component of healthy diets and are the best gift from nature to nurture the humankind.
This article describes the health benefits of FVs, the rich varieties available, their composition, production scenario in India, daily intake and trends over time, barriers to sufficient intake, how to promote FVs rich diets and the way forward to maximize the intake to proactively prevent non-communicable diseases (NCDs). The WHO and the Dietary Guidelines of India suggest 400 g of FVs per day to reduce NCDs and for overall health,. These enhance the diversity of diet and play a prominent role in the prevention of deficiency disorders and diet-related chronic diseases such as cardiovascular disease (CVD) including stroke, cancer, diabetes mellitus (DM), cataract, age-related maculopathy, gastrointestinal problems, chronic obstructive pulmonary disease (COPD) and bone health. This review highlights the health benefits in relation to CVD, obesity and DM. Briefly, micronutrient deficiency is also emphasized.
| Mortality & disability-Adjusted life years (DALYs)|| |
About one per cent of disability-adjusted life years (DALYs) and 2.8 per cent of mortality globally are due to low FVs consumption. Worldwide, 5.2 million deaths (3.4 and 1.8 million deaths for FVs, respectively) have been attributed to the inadequate intake of FVs. To improve the FVs intake, focused approaches are required through all stages of life. There is an urgent need for policies to promote varieties and support enhanced production, processing and distribution of FVs to the public.
| Micronutrients|| |
Hidden hunger or micronutrients (MN) inadequacy is a public health problem, and worldwide about two billion people suffer from chronic deficiency impacting mortality, morbidity, growth, development, cognition, immune functions, productivity and economy. Hidden hunger indices are high in sub-Saharan African countries, India and Afghanistan. About a third of two billion people suffering from MN deficits are in India. Currently, dietary patterns or food quality, a diversified diet is considered as crucial for the inadequacy of MN. In a model diet, vegetables contribute 12 per cent of iron, 80 per cent of vitamin C, 23 per cent of folates and eight per cent of zinc intakes and fruits to 6, 20 and 12 per cent (mainly greens) respectively to iron, vitamin C and folates in India.
| Nutritional classification|| |
FVs are packed with several nutrients and vital sources of β-carotene (precursor for vitamin A), vitamin C, folic acid, dietary fibre, minerals (potassium, magnesium, zinc and calcium) and several other bioactive compounds including polyphenols and relatively low in calorie, fat and sodium. These nutritional qualities highlight the importance of FVs as a component of the daily diet. The nutrient and colour classification of FVs are shown in [Figure 1].
|Figure 1: Colour classification and nutrient composition of fruits and vegetables. Source: Refs 9, 10.|
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| Production|| |
The varied agro-climatic conditions of India favour the production of an array of fresh FVs. These represent over 90 per cent of the horticulture crop production. According to the latest report from the National Horticulture Board (NHB), currently 6480 and 10290 million hectare land is used for the production of fruits and vegetables, respectively in India. The productivity was 14.33 (fruits) and 17.01 (vegetables) metric tonnes/hectare in 2016-2017. Next to China, India is the leading producer of FVs in the world, with a production of 92.8 MT and 175 MT of fruits and vegetables, respectively. This approximately represents 10-15 per cent of the global supply [Figure 2].
|Figure 2: Production of fruits and vegetables during 2004-2012. Source: Ref. 11.|
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The government of India has initiated the Horticulture Mission in several States for Integrated Development of Horticulture for enhanced production of FVs in the country. India may develop as a foremost horticulture crops producing, exporting and consuming country in the world.
| Consumption of fruits and vegetables|| |
In many countries, several segments of the population are consistently consuming less than the daily recommended FVs intake. More than 75 per cent of men and women consumed less than recommended servings of FVs in 52 low- and middle-income countries. In India, 74 per cent of adults consumed low amounts of FVs.
According to the recent National Sample Survey Office (NSSO) report, there has been a slight decline in the calorie contributed by FVs as %E in both rural and urban segments [Figure 3]. The consumption of fruits (kg/person/annum) was 9.6 and 15.6 among rural and urban Indians respectively while the intake of vegetables was 74.3 (rural) and 79.1 in urban population. The data from National Nutrition Monitoring Bureau (NNMB) report also suggested low consumption of FVs, 127 and 26 g/consumption unit/day for vegetables and fruits, respectively.
|Figure 3: Trends in per cent calorie contribution of fruits and vegetables in urban and rural India. Source: Ref. 14.|
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A study in 1001 individuals ≥18 yr, fresh FVs intake across five cities of India was below the WHO recommendations (400 g or 5 servings of FVs). In cereal staple, Indian diet FVs contributed only nine per cent of total calories with an average intake of 3.5 servings/day (1.5 and 2 serving of FVs, respectively). The study further highlighted the intake was <3 serving/day among the younger generation (18-24 yr). There was variation from city to city with respect to intake of FVs. Chennai had the highest (4.35 servings/day) and Kolkata reported the least (2.81 servings/day).
| FVs intake and diseases|| |
Cardiovascular diseases (CVDs)
The global epidemiological scenario suggests that CVDs represent the most widespread and challenging health issue. Of the 17.7×10 deaths <70 yr of age, 82 per cent were in low- and middle-income countries, of which 37 per cent were due to CVD in 2015. Globally, deaths due to coronary heart disease (CHD) and stroke were 7.4 and 6.7 million, respectively.
CVD is the primary cause of death in India and accounts for two-thirds of mortality due to NCDs. Over 50 per cent of deaths occur prematurely between ages 30 and 69 yr. According to the Global Burden Disease Report 2017, heart disease accounts for about 2.74 million deaths in India. The major drivers of this epidemic are demographic transition, globalization, socio-economic factors, urbanization and liberalization of markets which have impacted the food environments. The public health consequences impact human capital, sustainable development and overload the health-care system.
The global health risk report identified tobacco, alcohol, high blood pressure (BP), body mass index (BMI), cholesterol, blood glucose, low intake of FVs and physical inactivity accounting for 61 per cent of cardiovascular deaths. FVs is one of the crucial food groups which impacts CVD and other NCDs. About 11 per cent of coronary artery disease (CAD) and nine per cent of stroke deaths worldwide results from unsatisfactory consumption of FVs. DALYs attributed to low FVs intake are highest in middle-income European countries and South East Asia. The various study details and important findings are presented in [Table 1].
|Table 1: Effect of fruits and vegetables consumption on cardiovascular disease- A summary|
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In a pooled analysis, 2190 incident cases of CAD from the Health Professionals' Follow Up Study and Nurses' Health Study, the highest quintile of FVs intake (5.1 for men and 5.8 serving/day for women) had a lower risk ratio (RR) of CAD 0.80 and a four per cent reduction was observed for one extra serving of FVs (P for trend=0.01). Green leafy vegetables (GLVs) and citrus fruits (CFs) accounted for the protective effect. In Physicians' Health Study, the role of aspirin and beta-carotene was assessed in a randomized trial, for primary prevention of CVD among male doctors, considering vegetables as a continuous variable, an RR of 0.83 was recorded, the protection being more evident in men with BMI ≥25kg/m2 comparing highest and lowest intake (>2.5 vs. <1 servings/day).
Prospective cohorts, metabolic and intervention studies from 147 original publications concerning diet and CHD strongly suggest that apart from quantity and quality of fat and protein in diets, plenty of colourful FVs rich in phytomicronutrients/antioxidants will offer protection and prevent CVD. In the first National Health survey of US, after 19 years an inverse association was documented with FVs intake and CVD. Higher intake of FVs (≥3 vs. <1 times/day), a lower stroke incidence and reduction in mortality due to stroke, ischaemic heart disease (IHD), CVD and total mortality were recorded. In the same group, dietary intake of folate protected against the incidence of stroke and CVD.
It has been documented that plant-based foods such as FVs, nuts and whole grains decrease the risk of CVD and strokes. The antioxidants in the various types of FVs and a prudent dietary pattern may be the right prescription for lifestyle-related disorders. In Kuopio Ischaemic Heart Disease Risk Factor study in Finland mean higher intake (408 g/day) of fruits, berries and vegetables, jams, juices and nectars was associated with lower risk of mortality (total, non-CVD and CVD).
The INTERHEART study recorded several risk factors of acute myocardial infarction (MI) in 52 countries. For daily consumption of FVs, an odds ratio 0.70 (30% protection) and in those who did not consume FVs daily, population attributable risk factor was 13.7 per cent. The results were significant in both men and women in adjusted models. A case-control study of acute MI in India indicated a dose-dependent inverse association between consumption of vegetables and IHD risk which was stronger for GLVs intake. In a multivariate analysis, the median intake of 3.5 servings/week vs. 0.5 servings/week of GLVs had a 67 per cent lower risk of IHD.
In an exhaustive analysis in relation to risk of CVD and DM protective effect of FVs was observed. The author has quoted previous case-control, prospective and country-specific information documenting beneficial effects of FVs intake both for stroke and CAD, though in some due to inadequate sample size, the results tended towards significance particularly after adjustments. However, the conclusions are that larger sample size, high quality (high power) prospective studies are essential on the types of FVs to detect better association and causation.
Cardiovascular risk factors such as obesity, hypertension, fasting plasma glucose and dyslipidaemia were explored in a cross-sectional study in Chennai. When confounding factors were adjusted, the highest quartile of FVs intake (418 g/day) showed significant inverse association with systolic blood pressure; BMI, waist circumference, total and low-density lipoprotein (LDL) cholesterol concentration when compared with the lowest quartile (141 g/day). A higher consumption explained 48 per cent protective effect against the well-known risks of CVD.
A meta-analysis using quantitative approaches assessed the extent of the relation between FVs consumption and CAD. In all nine independent studies, 5007 events occurred between 5 and 19 yr. The results demonstrated that for one additional portion/day of FVs protective effect for CHD varied between 21 and three per cent and for fruits an increment of one portion/day varied from 19 to five per cent. For one extra portion of FVs/day, the risk of CHD reduced by four per cent for vegetables and seven per cent for fruits. In Chinese adults from Shanghai Women's Health Study and Men's health study identified 3442 and 1950 deaths in women and men, respectively in 10.2 yr. Overall FVs intake (P <0.03) was inversely related with risk of deaths due to CVD with a dose-dependent effect for cruciferous vegetables (CV) (P <0.0001).
In Jaipur heart watch study in India in an urban middle-class community, 68.7 per cent had low FVs intake, <3 helpings/day in addition to usual risk factors. In univariate analysis, low FVs was a determining factor for metabolic syndrome. The Indian migration study assessed the vegetarian diets and risk of CVD, in individuals who migrated to the urban area, their rural counterparts and permanent urban residents, from four regions and 18 States of India. The mean age was 40.9 yr, of which one-third were vegetarians, better educated, less likely to smoke and drink alcohol. Vegetarians had lower cardiometabolic risk factors including fasting glucose. The authors concluded the relative magnitude of these benefits was small from a clinical perspective. In the European Prospective Investigation into Cancer and Nutrition (EPIC) study, 13 yr hazard ratios (HRs) indicated that individuals who had more than 569 g/day of FVs had lower death risk from circulatory, respiratory and digestive disorders as compared to those consuming 249 g/day. Inverse associations were observed with consumption of vegetables in the raw form than cooked varieties with no association reported for fruit intake. A 24 yr study in Japan also elicited a 25 per cent reduction in total CVD mortality with highest intake (median intake 290 g/1000 kcal) of FVs.
Prospective cohorts study in Australia recorded that a higher consumption of FVs (≥7 servings/day) together accounted for 10 per cent reduced deaths due to all causes. Both raw and cooked vegetables also reduced mortality in minimally adjusted models. The strength and dose-response effects were assessed in a systematic review and meta-analysis for CVD, cancer and total mortality. The summary of results demonstrated reduced risk of CVD (CHD and stroke) and mortality due to all-causes were observed on an intake of 800 g/day for FVs combined. Premature deaths estimated were 5.6 million for <500 g and 7.8 million for <800 g/day. Apples/pears, CFs, GLVs salads and CVs were inversely related with CVD and mortality.
A prospective urban-rural epidemiological study (PURE) was conducted in 18 countries in seven geographical regions. The populations at baseline were without CVD. In this 10 years study, the impact of various food groups on the clinical endpoints was reported (median follow up of 7.4 yr). One serving was defined as 125 g of FVs. Higher fruits intake (age and sex adjusted) reduced the risk of major CVD, stroke, cardiovascular, non-cardiovascular and total deaths. However, vegetable intake was inversely associated with only cardiovascular, non-cardiovascular and total mortality, while in adjusted models no significant association was seen in most geographical regions. The trend towards benefit for CVD mortality was also reported. However, fruit, vegetables and legumes consumption considered together were inversely related only to non-cardiovascular and total mortality.
Strokes are as common as CAD with serious outcomes and several investigators have shown an inverse association of FVs intake with the disease and its outcome. An investigation among men with ischaemic stroke patients, comparing highest quintile of FVs intake (median 5.1 and 5.8 servings/day in men and women, respectively) with the lowest quintile (median 2.6 and 2.9 servings/day in men and women respectively) observed 31 per cent risk reduction. An additional serving of FVs per day elicited six per cent lower risk of ischaemic stroke. The protective effect was attributed to CVs, GLVs, CF and the juice.
A prospective cohort study in Japanese men and women followed up for 18 yr, 1926 deaths from all types of stroke were registered. More frequent consumption of green-yellow vegetables and fruits reduced the risk of death (32% in men and 30% in women) from stroke. Regular fruit intake daily was associated with a significant 35 per cent reduction in all types of strokes risk in men and a 25 per cent reduction in women. The association was strong for both types of stroke.
In Denmark, cancer and health prospective study, 266 cases of hospitalized ischaemic strokes were analyzed. After adjustments for potential confounders, persons in the highest quintile of FVs intake (median consumption 673 g/day), 28 per cent protection was noted compared to persons in the bottom quintile intake (median-147g/day; P for trend=0.02). The protection was higher for fruits (40%-P for trend=0.02), the risk being significant for CF in unadjusted model (P <0.01).
In a meta-analysis of seven cohort studies, five from the US, one each from Europe and Japan investigated the intake of FVs in relation to stroke. A total of 2955 stroke event occurred within 3-20 yr. The results showed the risk reduction in stroke as 11 per cent and for each extra portion of fruits a five per cent and for one combined FVs intake a three per cent reduction was documented. A linear relationship was observed between the intake of FVs and strokes suggesting dose response effects. Another meta-analysis of 4917 stroke events was performed during 13 yr follow up. Comparing persons with <3 servings of FVs compared to that of >3-5 servings/day an RR of 0.89 and with >5 servings/day an RR of 0.74 were observed. Diets with plenty of FVs, whole grains, fibre from cereals, folate and fatty fish, similar to Mediterranean dietary patterns are likely to reduce stroke risk.
Processed and raw fruits and vegetables consumption and protection from stroke were assessed in a population-based cohort study in the Netherlands. In 233 newly diagnosed strokes cases, HR for total, ischaemic and haemorrhagic stroke were calculated for a mean follow up of 10.3 yr. Strokes reduced by 30 per cent (HR): 0.70 in those with high intake of raw FVs (262 g/day) compared with low intakes (92 g/day; P for trend=0.07). Processed FVs was not related probably due to loss of heat sensitive nutrients and non-nutrients.
DALYs due to the effects of 67 independent risk factors and clusters for 21 regions over a period of 20 yr (1990-2010) were calculated. Low fruits and high sodium intake combined with other dietary risk factors and physical inactivity accounted for 10 per cent (UI 9·2-10·8) of global DALYs. Globally, shifts in DALYs and current risks varied across regions. The minimum risk for IHD, different forms of strokes and cancers at several sites with fruits was for a consumption of 300±30 g/day and for vegetables 125±12.5 g/day. DALYs attributed to diets with low fruits and vegetables were 30 and 12 per cent, respectively. The % increase in fruits and vegetables rank order was 29 and 22 per cent for FVs respectively from 1990.
The association between food groups and stroke mortality was examined in five ethnic minorities groups in the US between 1993 and 1996. Total deaths due to stroke were 860. A significant risk reduction in fatal stroke with high vegetable intake was seen in African women (40%), while in Japanese American women high fruit intake reduced the risk of stroke by 57 per cent, while in men no impact was observed. In a prospective study of 4089 with stroke incidences, in 10.2 yr observations indicated 13 per cent stroke reduction (P for trend=0.01) in non-hypertensives. Consumption of apples, pears and GLVs was inversely associated with stroke.
A total of 16 prospective cohort studies in a meta-analysis quantified the dose-response relation between FVs consumption and deaths due to CVD, cancer and all-cause mortality. Confounding factors were adjusted in most cohorts. The data supported the current recommendation for 400 g/day of FVs intake. The average risk reduction for CVD mortality was four per cent for each additional serving of FVs, while fruits alone reduced mortality by five per cent and vegetables by four per cent.
Hypertension is a risk factor for CVD and strokes. It is well known that DASH diet (dietary approaches to stop hypertension) is not only low in total fat, saturated fat (low in dairy fat) and sodium but is rich in FVs and reduces blood pressure. FVs are full of vitamins, minerals, fibre and potassium, which help to balance out the negative effects of salt. A project in Spain, in age- and sex-adjusted models, documented an inverse linear relationship for FVs intake and prevalence of undiagnosed hypertension. The adjusted risk for undiagnosed hypertension (upper vs. lowest quintile for intakes) was 42 and 32 per cent lower for vegetable (957 vs. 240 g/day) and (726 vs. 114 g/day) fruits, respectively. A high FVs intake in Mediterranean population was inversely associated with BP levels despite high fat in the diet and in a meta-analysis Mediterranean diets (MD) with high FVs intake had similar results.
In the INTERMAP (International Population Study on Macronutrients and BP) study both raw (68 g/1000 calories) and cooked (92 g/1000 calories) vegetables, in multivariate-adjusted models showed a significant reduction in systolic and diastolic blood pressures. Raw carrot, cooked peas and celery, tomatoes and scallions in both forms were significantly inversely related to BP. A meta-analysis of 25 studies (2 from the US, 13 from Asia 5 each from Europe and Africa) in hypertensives comparing the highest and lowest intake the pooled RR for hypertension was 0.81 for FVs, 0.73 for fruit and 0.97 for vegetables.
The protective effect of apples which contains fibre, polyphenols, vitamins C, E and potassium, on CVD risk, risk for total and cancer mortality, aortic calcification and forearm blood flow responses has been documented. Apples also reduced cholesterol due to pectin, but the juice had no effect, probably due to fructose. The synergistic effects of polyphenols and fibre modify risk factors for CVD.
CVDs are primary cause of death and disability in India which occur a decade earlier both in urban and rural areas and has serious economic impacts. The challenge ahead is enormous, and it would be best to invest in enhancing FVs intake for protective effect.
Diabetes & obesity
Globally, diabetes is the fastest growing disease affecting over 451 million people and resulting in >5 million deaths. Global data suggested that approximately 673 billion dollars were spent for treating diabetes during 2015-2016. Recent ICMR-INDIAB estimates 7·3 per cent prevalence of diabetes across 15 States of India. Diabetes not only enhances the risk for CVD but is an important cause of morbidity and mortality. Obesity is another independent risk factor contributing to chronic diseases such as type 2 diabetes. According to Global nutrition report (2017), two billion adults are overweight or obese and 16 per cent of men and 22 per cent of women in India are overweight.
The ICMR-INDIAB (India Diabetes Study)- study reported the prevalence of generalized and abdominal obesity as 21 and 24.8 per cent, respectively while together prevalence was 28.6 per cent (199 million people) in India. 'Diabesity' is a new medical term linking obesity with diabetes and refers to increased insulin resistance. Altered lifestyles particularly dietary transitions (high intake of calorie-dense refined and fatty foods coupled with low intake of whole grains, FVs) and sedentary behaviours lead to the growing epidemic of obesity and DM.
FVs are known to promote satiety and reduce energy intake. However, not much is known about the role of different elements of FVs responsible for regulation of hunger, satiety and body weight. A few studies and meta-analysis have shown that increased intake of FVs may aid in the prevention of obesity and decrease body weight over time [Table 2].
|Table 2: Effect of fruits and vegetables on obesity and diabetes-summary|
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In Nurses' Health Study, risk of obesity in Women (74,063) was compared with respect to intake of FVs during 12 years follow up. The RR of becoming obese was reduced by 24 per cent on high intake (P-trend: <0.0001). The intake of FVs and weight change in participants aged 25 and 70 yr from the EPIC cohort indicted no changes in weight for five years (follow up). However, high fruit intake at baseline was negatively associated with weight gain among women and in men and women who discontinued smoking.
A meta-analysis of 17 cohort studies assessed the consumption of FVs with respect to changes in anthropometry. Fruits but not vegetables, total FVs combined was associated with decrease in body weight and waist circumference. The highest combined category of total FVs elicited nine per cent and vegetable and fruits as discrete groups elicited 17 per cent (each) reduced risk of fat deposits. The data from Women's Health Study showed that high ingestion of fruits at baseline was linked with reduced risk of becoming overweight and obese in women with normal BMI. However, total FVs, vegetables and dietary fibre were not associated with the long-term changes in body weight.
Epidemiological and prospective cohort studies have shown an inverse association between intake of selected fruits, GLVs and risk of DM [Table 2]. High intake of green leafy and dark yellow vegetable was inversely associated with lower incidence of diabetes among overweight women while fruits had no effects.
A prospective study among Chinese women reported an inverse association between highest quintile (428 g/day) of vegetable intake vs. lowest quintile (121.5 g/day) with 28 per cent reduction in the incidence of DM (P =0.01). The intake of different classes of vegetables including CV, GLVs, allium, tomatoes and other vegetables recorded a significant reduction in the incidence of DM. However, fruits had no significant association. The Nurse's health study with 18 years follow up had the lowest risk of DM. With one serving increase in GLV intake, nine per cent reduction was observed.
A prospective study examined the incidence of DM in relation to amount and variety of fruit, vegetables and combined FVs intake in men and women from the Norfolk component of the EPIC (EPIC-Norfolk) study. Both the quantity and variety of FVs and total FVs intake were independently protective for risk reduction of DM. After adjusting for potential confounders, the incidence of DM decreased by eight per cent for multiple varieties and quantity of FVs.
The highest intake of total FVs and fruits elicited a greater risk reduction (25% for FVs and 28% for fruits alone) for type 2 DM (T2DM) in a meta-analysis of 23 prospective studies (1992-2014). Another meta-analysis of seven prospective studies explored the association of CVs and CFs on the incidence of T2DM and reported a 16 per cent reduction with CVs intake. No such association was evident with CFs.
The association between T2DM and FVs intake using data from the National Institutes of Health-American Association of Retired Persons (NIH-AARP) study and the EPIC-elderly study recorded that pooled data had no effect of FVs diabetes risk reduction. However, the NIH-AARP study independently demonstrated reduced diabetes risk with fruit (5%) and GLVs (13%) in elderly.
The China Kadoorie Biobank-seven-year prospective study among 0.5 million Chinese adults showed that fresh fruit consumption reduced the risk of diabetes including mortality and major vascular hospitalizations in known diabetes patients at baseline. Individuals without diabetes initially, who regularly consumed high amounts of fruits had a significant lower risk of developing diabetes as compared to non-consumers participants with known diabetes, higher fruit consumption was associated with lower risks, total mortality from all causes and macro-vascular complications.
Higher intake of sugars is often associated with negative impacts of health including increase in body weight and risk of diabetes and CVD. On the contrary fruits rich in sugar elicit lower glycaemic response (GR) and are in general recommended as a part of healthy diet. This may be due to the cell wall and fiber content of fruits that may perhaps restrict absorption of sugar. Low GI fruits diets are associated with lower glycated haemoglobin (HbA1c), blood pressure and CHD risk. A study from India made an attempt to evaluate the GR of mango against white bread as reference food, among Indians with DM. The findings showed that mango elicited lower GR than reference bread. This may be attributed to the high moisture content in mangoes.
In general, fruits appear to be better for weight reduction while in addition to fruits, CV and GLVs were found to be protective for DM. Significant valid data from clinical trials are scarce. Well-designed intervention trial and large prospective studies are needed to assess the effectiveness of total and individual FVs for risk of obesity and T2DM.
| Interventions|| |
Food-based interventions are difficult to conduct and at best can measure only the intake. Very few clinical endpoints can be targeted. The DASH diet trial with high FVs, fish and low saturated fat and salt decreased blood pressure in hypertensives. The Lyon heart study with dietary advice similar to DASH diet in MI patients following MD reduced cardiovascular morbidity within 12 months and extended survival after five years.
In a randomized trial in a general population, the intervention group was advised to enhance FVs consumption. This group significantly enhanced their FVs intake by 1.4 serving and had greater increase in plasma concentrations of carotenes, phytonutrients, vitamins A, E and C than controls. Both systolic and diastolic blood pressure (SBP and DBP) reduced in intervention group. The WHO in a review identified interventions and programmes promoting FVs intake worldwide among children in school settings, adults in general population, worksite, healthcare settings, low-income population, churches, supermarkets, other retail settings and individuals with CVD and cancer. A large number of interventions showed improvement in FVs intake post-intervention particularly in CVD and Cancer patients.
In a study dose-response effects were seen with increasing servings of FVs for two months. Further, forearm blood flow responses enhanced by 6.2 per cent. In a Cochrane review of 10 trials with one ongoing, provision of FVs in six trials, and advice to enhance the intake of FVs in four trials, directed at high-risk adults of CVD or healthy adults showed favourable effects on SBP (−3 mmHg) and LDL-cholesterol but not on DBP. Variations were noted in types of FVs provided (one each of FVs) and advice for number of servings ranging from 2 to 9. The trials were too short (three months to one year) to impact clinical endpoints.
Consumption of FVs improved when habit-based intervention message through electronic media was delivered to undergraduates. In a systematic review of trials promoting FVs among 1026 individuals, mean difference of 133 g of FVs between intervention and non-intervention group resulted in weight reduction of 0.68 kg (P =0.01). A systematic review of 55 trials on child feeding practices examined 11,108 participants. Small differences (4.3 g/day) were observed between those with interventions versus no interventions.
An updated systematic review and meta-analysis highlighted the health effects of adherence to the MD which is rich in FVs. Increased adherence to MD showed significant reductions in overall mortality, both CVD and cancer incidence and mortality, and neurodegenerative diseases.
Interventions with FVs and their implications particularly the clinical endpoints are difficult to interpret because of extended durations, fluctuating intakes, available varieties, permutations and combinations of bioactives/nutrients, their bioavailability and finally in vivo blood levels and their synergistic activity.
| Mechanisms of action of fruits and vegetable|| |
FVs through several mechanisms can modify risk of CVD, diabetes, cancer and obesity and other NCDs,,,,,. The various mechanisms of action of FVs are summarized in [Table 3].
| Barriers to consumption|| |
It is a great challenge to encourage better lifestyles and promote FVs intake in the population. These are the best substitutes for high energy foods due to their volume and nutrient density. Knowledge, attitudes and practices survey and focus group discussions are the best way to judge the existing barriers for consumption of FVs.
Individual's idiosyncrasies reflect food choices with little concern for nutritional/functional benefits,. IEC is a time-tested method to impart nutrition education. In addition, a favourable environment is essential for the community to practice what they have learnt [Figure 4].
|Figure 4: Barriers for fruits and vegetable consumption. FVs, fruits and vegetables; NHB, National Horticulture Board.|
Source: Refs 95-100.
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Changing food habits is difficult in the absence of overt adverse effects. Inculcating food habits from early life might influence the adult behaviours. Social marketing strategies have been used to enhance GLVs and fruits intake to overcome vitamin A deficiency using change agents in India. It is always good to use the local administration and promote through the community particularly women, schools, worksites and deliver information, education and communicate for behavioural modifications.
Availability & accessibility
FVs must be made available throughout all places and seasons and at distances, which people can access easily. Promoting local production and periodic inputs from agricultural extension workers can enhance accessibility. In rural centres, donating land for growing FVs and giving illustrative fact sheets will be of immense benefit. Creating marketing channels, cold chain and refrigerated transport are essential for sustained production and distribution. The government of India has set up a National Horticulture Board (NHB), which has several schemes and subsidies, to cover production, primary processing, cold chain facility and distribution including expert consultancy facilities. A recent review elaborates on marketing and production problems such as natural calamities, weather vagaries, demographic pressures, use of pesticides, demand for organic produce and migration that are linked to production. Horticulture is economically productive, and there is scope for further strengthening trade-related preservation, processing and infrastructure strengthening.
A study across 18 countries highlighted that affordability was the prime determinant of FVs intake (PURE). The qualitative method identified 'that FVs were expensive and were a relatively intractable barrier' for those with 'inflexible food budget'. In urban India, affordability is a strong barrier to FVs intake. India being one of the largest producers of variety FVs, if the supply chain management is streamlined almost 25-30 per cent wastage can be avoided, improving affordability.
A recent survey conducted in India across four metros in 1001 individuals clearly brought out the impediments for consumption of FVs. Lifestyle issues (52%) followed by seasonal availability (26%), higher cost and dislike (20%) were reported by majority of participants as inability to meet the WHO recommended intake.
Trade (domestic and international) can unmask unexploited potentials in developing or Asian countries to drive production, distribution and enhance availability and provide economic opportunity for farmers. Health sectors can be the advocates for policy inputs into horticulture initiatives. 'Aid for Trade' by governments and donor agencies can invest in infrastructure, technical inputs to impact quality, production, processing, supply chain and export.
| Policy initiatives|| |
Policies should essentially promote and support dietary diversification with FVs. The availability of FVs has increased slightly in most countries but is still well below the recommended level both in developed and developing countries.
Chronic diseases needs priority attention from policymakers, health personnel/consumers and agriculturalists and industries to emphasize on natural foods that are both innately healthy and minimally processed. The overall dietary patterns and the food matrix determine the health outcome, and hence foods and food-based approaches, not nutrients should be the focus of attention. Energy intake and output and the quality of diet ultimately influence body weight, composition, metabolic health, microbiome and health and disease profiles in the community.
In order to have an optimistic impact on chronic diseases and MN deficiencies, the Global Burden of Diseases Collaborative Network and global health risk factors can help policymakers to have a dedicated approach and achieve global health targets for the double burden of diseases. It is important to understand the risks to formulate policy and effective approaches and implement environment-specific strategies at national levels. The barriers for adequate intake have to be broken to enhance the consumption of FVs in all age groups. The Indian scenario, barriers, policy issues and the current mission mode approaches to enhance the consumer consumption have been highlighted. Enhancing the production and consumption proactively in required amounts of FVs will prevent the disease from affecting the population and reduce healthcare expenditures and demands on health systems. The five As (attitude, awareness, availability, accessibility and affordability) require concerted efforts. High-risk individuals and the population at large need to be targeted through dietary guidelines and disease counselling and management. The strategies and actions are indicated in [Table 4] to promote healthy and mindful intakes in the community. The healthy eating pattern should be wide-ranging, steady, sustainable and economically viable in all segments of the population.
|Table 4: Policy initiatives (multi-sectoral, multi-pronged/multi-faceted and cohesive approaches in unison with stakeholders for common vision and objectives)|
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Healthcare professionals such as peripheral workers from diverse backgrounds especially in developing countries can serve as motivators at all levels. Public-private partnerships can create a healthy environment and healthy alternatives for consumption. Public health interventions should be tailored to the health needs of the population and address the socio-economic, cultural, environmental and behavioural determinants of food habits. The Alliance for Food and health (2017) has explicitly set out a multistakeholder approach for better health, in track with sustainable goals of UN particularly, 'Good Health and Well-Being'. The Government of India has initiated an NCD prevention strategy with several action-oriented programmes which includes both primary and secondary prevention covering all risk behaviours.
| Conclusions|| |
This review described studies conducted to explore the health benefits of FVs, which in myriad ways impact deficiency and cardiometabolic problems. Nutrient approaches are currently replaced by food-based approaches. Literature is replete with evidence that FVs are the corner stones for enhancing the quality of diet to impact the twin burden of diseases particularly in developing countries. Plentiful FVs (half the plate) are promoted as healthy foods and as a viable sustainable solution. Raw vegetables appear to be better than cooked, and fruits better than fruit juices for health impacts. However, consensus on the optimal intake, which reduces chronic disease death and disability, is varying widely, including global estimates. FVs vary in their nutrients, bioactive and availability from a highly complex food matrix. Cultural practices and variety of cuisines may either augment or mitigate the beneficial role. Non-starchy vegetables, green and orange coloured vegetables, cruciferous variety, allium veggies, citrus and non-CFs may have pleotropic effects. Overall dietary patterns and choices are influenced by individual, socio-cultural and environmental factors. Although hedonistic attributes are important, availability/affordability particularly influence consumer choices. Barriers can be overcome by modern horticulture creativities, appropriate public health measures, their outreach and policies with cooperation from all stakeholders. Conscientious eating habits pave the way for healthy habits and wholesome life.
Acknowledgment: Authors thank Ms Sudha, Sr. Scientist, Madras Diabetes Research Foundation for her valuable suggestions, and acknowledge Ms Anjana Ramalingam and Ms Kalpana for helping in formatting the Tables and References.
Financial support & sponsorship: None.
Conflicts of Interest: None.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2], [Table 3], [Table 4]
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