Do you have any allergies to any specific foods you eat? What symptom do you experience? What you do that makes you feel better? When you are allergic to a certain food means your immune system can't tolerate and makes you feel sick. The immune system is weak and it's not strong for the body to fight it. You should always becareful and always have good nutritional foods. The immune system is the most important role in the body. Try talking to your doctor about what nutritional supplements are good to take for having a healthy and strong immune system. For example taking mutivitamins is a good idea but if you have allergies talk to your doctor first before taking them.