According to Keri Glassman, author of the O2 Diet, the best way to eat for a flat belly is to eat “portion-controlled meals that include whole-grain foods and monounsaturated fats (MUFAs) throughout the day”.
MUFAs are plant-based fats that can be found in avocado, nuts and seeds, olives and dark chocolate, and research has shown that they help target fat in your tummy.
Whole grains, meanwhile, contain magnesium and chromium, two nutrients that combat cortisol, a stress hormone that directs fat to be stored around the waist, and keep insulin production down – high levels of the hormone also encourage fat to collect around the stomach.
Research has shown a direct link between green tea and smaller waists. Green tea contains compounds called catechins, which increase the release of fat from fat cells, help boost energy expenditure and speed up the burning of fat by the liver. Study participants drank four or five cups a day, but any amount will benefit your body.