Wonderful question. I don't know the answer, but I can't help thinking that doctors in the field of medicine could probably point out certain food that might build our strength. Certain vitamins help us to field more energetic. Bananas are a good source of Potassium. There is a lot od good nutritious food that can help us to feel healthier. Good health helps us to fight off germs better. If we are not in good health, our bodies have a more difficult time fighting off certain conditions.
I always felt a boost when I drank orage juice, or a can of V8. I liked Power Aid when I worked outdoors. When I worked outdoors, and only drank water I fel like I would get tired faster. Energy drinks made me work better I think.
I have no exact idea how to promote growth of antibodies, but Google it, and see what that comes up with. To say for sure what will promote growth in them I could not say.
God Bless You .