Adopting a low-fat diet and foregoing guilty pleasures such as crisps and fry-ups may not be the best way to slim, a study has found.
Experts who analysed data on more than 68,000 adults found that curbing fat intake did not lead to greater weight loss than low-carbohydrate or Mediterranean diets.
Scientists pulled together information from 53 trials comparing the ability of low-fat and other kinds of diet to shed unwanted pounds over a period of at least one year.
They found no significant difference in average levels of weight loss between reduced-fat and higher-fat diets. Diets that cut out fat were actually slightly less effective than those based on lowering carbohydrate consumption, the researchers reported in The Lancet Diabetes & Endocrinology medical journal.
Compared with not dieting at all, avoiding fat resulted in 5.4kg being shed after a year, while low carbohydrate diets added another 1.15kg of weight loss.
Lead scientist, Dr Deirdre Tobias of Brigham and Women’s Hospital and Harvard Medical School in Bostonsaid: “There is no good evidence for recommending low-fat diets. Behind current dietary advice to cut out the fat, which contains more than twice the calories per gramme of carbohydrates and protein, the thinking is that simply reducing fat intake will naturally lead to weight loss. But our robust evidence clearly suggests otherwise.”
She was challenged by British nutritionist Professor Susan Jebb, from OxfordUniversity.
“Weight losses of 5kg may be less than many people might hope for but we know from many other research studies that this brings surprisingly large health benefits, more than halving the risk of developing diabetes in people with raised blood sugar,” she said.
“These benefits are attenuated but not lost if weight is regained. Inaccurate reports that dieting is ‘ineffective’ undermine public confidence and deter health professionals from encouraging and supporting people who are overweight to lose weight.”
Professor Tom Sanders, anutrition expert from King’s College London, said: “It is not surprising that the diets focusing on restricting carbohydrate intake led to slightly greater weight loss, as carbohydrate typically supplies 45-50% of the energy intake. It is easier to reduce energy intake by cutting back on the amount of bread, potatoes and rice in the diet.”
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