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Low-carb diets could shorten life, study suggests

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A low-carb diet could shorten life expectancy by up to four years, a study suggests.
Low-carb diets, such as Atkins, have become increasingly popular for weight loss and have shown promise for lowering the risk of some illnesses.
But a US study over 25 years indicates that moderate carb consumption – or switching meat for plant-based protein and fats – is healthier.
The study relied on people remembering the amount of carbohydrates they ate.
In the study, published in The Lancet Public Health, 15,400 people from the US filled out questionnaires on the food and drink they consumed, along with portion sizes.
From this, scientists estimated the proportion of calories they got from carbohydrates, fats, and protein.
After following the group for an average of 25 years, researchers found that those who got 50-55% of their energy from carbohydrates (the moderate carb group and in line with UK dietary guidelines) had a slightly lower risk of death compared with the low and high-carb groups.
Carbohydrates include vegetables, fruit and sugar but the main source of them is starchy foods, such as potatoes, bread, rice, pasta and cereals.
The NHS Eatwell Guide provides details on how to achieve this kind of healthy, balanced diet and reduce the risk of serious illnesses in the long term.
Researchers estimated that, from the age of 50, people in the moderate carb group were on average expected to live for another 33 years.
This was:
four years more than people who got 30% or less of their energy from carbs (extra-low-carb group)
2.3 years more than the 30%-40% (low-carb) group
1.1 years more than the 65% or more (high-carb) group
The findings were similar to previous studies the authors compared their work with, which included more than 400,000 people from more than 20 countries.

Exchanging carbohydrates for plant-based fats and proteins might promote healthy ageing, experts said

The scientists then compared low-carb diets rich in animal proteins and fats with those that contained lots of plant-based protein and fat.
They found that eating more beef, lamb, pork, chicken and cheese in place of carbs was linked with a slightly increased risk of death.
But replacing carbohydrates with more plant-based proteins and fats, such as legumes and nuts, was actually found to slightly reduce the risk of mortality.
Dr Sara Seidelmann, clinical and research fellow in cardiovascular medicine from Brigham and Women’s Hospital in Boston, who led the research, said: “Low-carb diets that replace carbohydrates with protein or fat are gaining widespread popularity as a health and weight-loss strategy.
“However, our data suggests that animal-based low carbohydrate diets, which are prevalent in North America and Europe, might be associated with shorter overall life span and should be discouraged.
“Instead, if one chooses to follow a low carbohydrate diet, then exchanging carbohydrates for more plant-based fats and proteins might actually promote healthy ageing in the long term.”

SourceBBC NEWS

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