How to Lose Belly Fat When Running Another tip for losing belly fat: Dr Oz: Slimdown Drink Combine 1 C grapefruit juice, 2 tsp apple cider vinegar, and 1 tsp honey. Drink this combination before every meal. Apple cider vinegar helps you burn and break down fat. This drink combination also burns away your fat, literally. Drink it 3 x per day before meals.