My favorite anytime snack: apples, especially honeycrisps. They have a low glycemic index (GI), which means energy is supplied to the body evenly rather than in surges, which is what happens when you eat snacks loaded with sugar. Low GI snacks are great for losing fat because they keep your body's metabolism working more regularly. I stuck to a low GU diet when I was training several hours a day in muay thai and have never felt better.