Healthy Food Chart

My boyfriend’s problem is that he needs to gain weight. I have forced him to eat anything he can, and drink a lot of products with “weight-gain” in them.

But, he doesn’t seem to gain any weight, he may even have lost some.

Sometimes I envy him for this, but I have to help him to gain weight. Recently, he seems to get sick often–is there any connection with being under-weight and poor health?

I wonder if smoking affects his weight? Can you please give me some advice?

Thank You!