They aid in digestion and the proper break-down of foods so your body can absorb the nutrients efficiently. They work against the bad bacteria that sometimes invade your digestive system and cause diarrhea.
Eating as many fruits and vegetables as you can will boost your nutrition. They are filled with essential vitamins and minerals and will also help your immune system stay strong. Make sure to still eat your protein at meals, just try to eat a smaller amount and if you feel like snacking, pick up some carrot sticks.