Eating a banana at room temperature at breakfast can help decrease belly fat if accompanied by a healthy diet, according to NutrientStudies.com. Bananas help decrease belly fat because they contain enzymes that help increase digestion, leading to weight loss.
Bananas are a resistant starch, therefore they promote fullness and can increase the rate at which fat is burned, notes NutrientStudies.com. Bananas are also full of potassium that helps limit the swelling of the belly caused by sodium, according to CBS News. NutrientStudies.com recommends staying away from dairy products, alcohol and sugary desserts after dinner as these habits can negate the fat-burning effects of eating bananas.