Gene test claims to show what diet works best

Diet not working? Blame your genes. That's the pitch behind a new test that claims to show whether people will do better on a low-fat or a low-carb weight loss plan.

We're all hard-wired with DNA that controls how we burn and store calories from various foods, and the test claims to sort out this machinery. A study this week found that women on diets well-matched to their genes, as defined by the test, lost roughly five times more weight than those on mismatched diets.