Best Foods for Weight Loss 5: Iced Green Tea Skip the latte and reach for an iced green tea! A recent study published in the Journal of Nutrition found that people who exercised and drank plenty of the green stuff lost slightly more weight and shed more belly fat than non-tea drinkers. Why? Chemicals called catechins found in tea boost metabolism and increase fat burn. Toss frozen berries or slices of nectarine into your glassthey act as a natural sweetener.