Improving The Immune System?

Doctor, is there any truth to the suggestion that I can improve the function of my immune system if I eat the right foods?

Difficulty Losing Abdominal Fat

I recently turned forty and started developing extra fat around my middle. I eat well and get some exercise almost every day. I have tried all types of diets but can’t seem to lose fat from my abdomen. Why is it so difficult for me to lose weight from my...