2. Eat foods that are rich in vitamin C
Eating foods that are packed with vitamin C will help to boost your immunity to common colds, flu and fatigue. You can add oranges to almost all foods to help you achieve your recommended daily allowance of vit C. Use orange juice instead of water when making rice or boiling vegetables. Add orange juice to a homemade salad dressing or mix orange with plain low-fat yogurt for a tasty alternative to sour cream or less healthy dips.