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.
If your child doesn't like to eat vegetables or fruits, try to be creative to get them to eat. Mix some sliced peppers or broccoli into spaghetti sauce. You can cut up some fruits and mix them into your child's cereal. They're more likely to eat healthy foods if they're mixed into foods they already like.