Grains, seeds, and nuts are rich in fiber, unsaturated fatty acids, vitamins, minerals, enzymes, and active antioxidants. This stimulates, among other things, your metabolism. In chia seeds, for example, there are tons of omega-3 fatty acids and the plant proteins help build up muscle mass, which is ideal for athletes. They also fill your stomach well and slow down your fat intake. Sprouts are known for their high nutrient content, and with their great flavor range from sweet to tart, they're a perfect addition to any meal. Seeds such as sunflower or pumpkin also make great healthy snacks.