Tummy fat

There is a book written by a certified nutrition called "Skinny girls don't eat salads." I try not to buy into random diets, because we all know that the only way to lose weight is to burn more calories than you eat. But, I saw the author on TV a few days ago, and she says that a study was done at Yale University that shows that women who eat "just a few" nuts at every meal burn up to 33% more belly fat, because the fats in nuts are monounsaturated and increase metabolism. Also, she said that blueberries, raspberries, blackberries, and cherries contain a compound that helps fight the hormone "cortisol," which is responsible in part for storing belly fat. I figure since you are suppose to eat fruit anyways, it wouldn't hurt to try