In dieting, low-fat or low-carb are the same

MIAMI: Common dieting advice urges people to either eat fewer carbohydrates or less fat in order to shed weight. But a study Tuesday found neither approach is better than the other.

Nor is a person’s genetics or insulin metabolism a key factor in whether a diet works for them or not, said the report in the Journal of the American Medical Association (JAMA).The findings could have implications for the $66 billion US weight loss industry, and particularly the latest trend of DNA dieting, which claims to point people to the best diet for their genes.

“We’ve all heard stories of a friend who went on one diet — it worked great — and then another friend tried the same diet, and it didn’t work at all,” said lead author Christopher Gardner, professor of medicine at Stanford University.

“It’s because we’re all very different, and we’re just starting to understand the reasons for this diversity. Maybe we shouldn’t be asking what’s the best diet, but what’s the best diet for whom?”

The study enrolled 609 people — 57 percent women — aged 18 to 50 and randomly assigned them to either a low-fat or low-carb diet for a year. At the end, the average weight loss was 13 pounds in both groups. Some individuals lost far more — up to 60 pounds, while some gained 20. But researchers were unable to find any link between dietary approach and superior weight loss.