Keen to lose weight, many slimmers believe the key to success is to follow a carbohydrate-free plan such as the Atkins diet.
But scientists say the best way to curb those curves is a low-fat regime.
While cutting out carbs leads to more weight loss, a low-fat diet helps people lose the flab which is most damaging to health, researchers found.
Experts said they hope the finding will help dispel the myth that carbohydrates such as potatoes and bread are particularly fattening. They said: "Consumers can stop beating themselves up for wanting to incorporate a moderate amount of carbs into daily life.
"Obesity is a disorder of excess body fat and loss of fat is what is important for health." In the first study of its kind, scientists from the US government's health research arm pitted a low-carb diet against a low-fat one.