If you do sit-ups every day until you're almost passing out, but your lower belly is still as loose as ever, you should probably take a look at your diet! The best foods for flattening your lower abdomen should meet the following criteria: contain large amounts of fiber, enough to eliminate bloating; contain antioxidants to make your workouts more effective; and also provide sufficient protein to promote healthy metabolism. Here, there are ten food options that meet these criteria – eat your way to a flatter stomach! 1. Almonds These delicious nuts are rich in...