Cut Down On Carbs and Not Fats For Longer Life

Highlights

• Moderate risk of death was associated with a lower risk of death.
• Consuming a higher amount of fat, about 35% of energy is associated with a lower risk of death.
• Limiting the intake of carbohydrates in the form of fruits, vegetables, legumes and grains to about 375 to 500 grams increases the life span.

Carbohydrates, protein, fat are the three major nutrients that provide calories to the body for energy other than the various functions they perform. A balance of these three nutrients with the demand of the body is vital for normal growth, development and formation of new tissues. Various diets change the percentage of these three nutrients for weight loss and for protective heart health.

A recent study done in more than 135,000 people across five continents has shown that a diet which includes a moderate intake of fat and fruits and vegetables, and avoidance of high carbohydrates, is associated with lower risk of death.

Fats Vs Carbs – Which One Is Bad?

Contrary to popular belief, consuming a higher amount of fat (about 35 percent of energy) is associated with a lower risk of death compared to lower intakes. But a diet high in carbohydrates (of more than 60 percent of energy) is related to higher mortality, although not with the risk of cardiovascular disease.

The lowest risk of death was in those people who consume three to four servings (or a total of 375 to 500 grams) of fruits, vegetables and legumes a day, with little additional benefit from more.

Date from the Prospective Urban Rural Epidemiology (PURE) study which followed more than 135,000 people from 18 low-income, middle-income and high-income countries were analysed. The study asked people about their diet and followed them for an average of seven and half years.

Advertisement

Dietary fats - are not associated with major cardiovascular disease, instead, higher fat consumption was associated with lower mortality. The findings hold good for all major types of fats (saturated fats, polyunsaturated fats and mono unsaturated fats), with saturated fats being associated with lower stroke risk.

Total fat and individual types of fat were not associated with risk of heart attacks or death due to cardiovascular disease.

Advertisement

The researchers point out that, while this may appear surprising to some, these new results are consistent with several observational studies and randomized controlled trials conducted in Western countries during the last two decades.

Mahshid Dehghan, the lead author for the study and an investigator at PHRI said, "A decrease in fat intake automatically led to an increase in carbohydrate consumption and our findings may explain why certain populations such as South Asians, who do not consume much fat but consume a lot of carbohydrates, have higher mortality rates."

Polishing The Current Guidelines

Dehghan pointed out that dietary guidelines have focused for decades on reducing total fat to below 30 percent of daily caloric intake and saturated fat to below 10 percent of caloric intake.

This is based on the idea that reducing saturated fat should reduce the risk of cardiovascular disease, but did not take into account how saturated fat is replaced in the diet.

She added that the current guidelines were developed about four decades ago using data from some Western countries where fat was more than 40 percent or 45 percent of caloric intake and saturated fat intakes were more than 20 percent. The consumption of these is now much lower in North America and Europe (31 per cent and 11 per cent respectively).

Fruits, Vegetables, Legumes and Heart Health

The second paper from the PURE study assessed fruit, vegetable and legume consumption and related them to deaths, heart disease and strokes.

The study found current fruit, vegetable and legume intake globally is between three to four servings per day, but most dietary guidelines recommend a minimum of five daily servings.

Given that fruits and vegetables are relatively expensive in most middle-income and low-income countries, this level of consumption is unaffordable for most people in many regions of the world such as South Asia, China, Southeast Asia and Africa, where the levels of their consumption are much lower than in Western countries.

"Our study found the lowest risk of death in those who consumed three to four servings or the equivalent to 375 to 500 grams of fruits, vegetables and legumes per day, with little additional benefit for intake beyond that range," said Victoria Miller, a McMaster doctoral student and lead author of the paper. "Additionally, fruit intake was more strongly associated with benefit than vegetables.

Previous research has shown that eating fruits, vegetables and legumes decreases the risk of cardiovascular disease and deaths, but most studies were conducted mainly in North America and Europe with a few from other parts of the world.

"Raw vegetable intake was more strongly associated with a lower risk of death compared to cooked vegetable intake, but raw vegetables are rarely eaten in South Asia, Africa and Southeast Asia," Miller said.

Dietary guidelines do not differentiate between the benefits of raw versus cooked vegetables. Recommendations should emphasize raw vegetable intake over cooked.

Legumes include beans, black beans, lentils, peas, chickpeas and black-eyed peas and are frequently eaten as an alternative to meat or some grains and starches such as pasta and white bread.

"Legumes are commonly consumed by many populations in South Asia, Africa and Latin America. Eating even one serving per day decreases the risk of cardiovascular disease and death. Legumes are not commonly consumed outside these geographic regions, so increased consumption among populations in Europe or North America may be favourable," said Miller.

Impact of fats and carbohydrates on blood lipids

The ratio of Apolipoprotein B (ApoB) and Apolipoprotein A1 (ApoA1), or organizing proteins in the blood, give the best indication of the impact of saturated fat on cardiovascular risk.

Andrew Mente, an investigator at PHRI and an associate professor of the Department of Health Research Methods, Evidence and Impact at McMaster, is an author on the three studies.

"The findings of these studies are robust, globally applicable and provide evidence to inform nutrition policies. This is relevant because in some parts of the world nutritional inadequacy is a problem, whereas in other parts of the world nutritional excesses may be the problem," he said. "Most people in the world consume three to four servings of fruits, vegetables and legumes a day. This target is likely more affordable and achievable, especially in low and middle income countries where the costs of fruits and vegetables are relatively high."

"Moderation in most aspects of diet is to be preferred, as opposed to very low or very high intakes of most nutrients," said Salim Yusuf, principal investigator of the study and the director of the PHRI.

Reference

1. Salim Yusuf et al.,International study shows moderate consumption of fats and carbohydrates best for health, The Lancet(2017)

.

Source-Medindia