Ooooops, I need to get off this computer and rest! I meant to say is you could post in the "Nutrition" forum, this is the "Gastroenterology" website that has to do with disorders of the abdomen, so if you'll tell us more about your condition, we can help you better. The rest of my post is fine. Sorry!!!
You might want to post over in the "Nutrition" forum at this website. This is the "Neurology" website that has to do with nerve disorders. If you have some sort of nerve problem that diet has an effect on, then tell us more about your condition so we can help you. In general, if you will buy your foods at a Natural Foods Store in your area, everything you get in there will be good for you to eat, and to gain weight, you eat (a) foods that on the label that have a high fat content, (b) eat more than you burn off through exercise, and (c) there are some special weight-gain shakes you can find in some weight-training type stores, a local gym might be able to tell you where one is.