I am a very picky eater myself, and I find it hard to find things I can and WILL eat. I eat a lot of plain pasta with just salt, crackers and cheese, cottage cheese (thankfully dairy doesn'y bother me), oatmeal, baked potatoes, scrambled eggs, peanut butter (I am guessing your dr meant not to eat nuts--thats kind of a universal no-no--but most nut butters are ok for us), applesauce, toast, bagels, chicken, rice, salmon, and bananas. As many others have said, it is really an individual thing and even sometimes there are foods that I can tolerate just fine one day, but the next time I have them its horrible. Its going to take a lot of trial and error. Keeping a food journal is a good idea. My doctor usually just says for me to eat whatever I can tolerate. You can always try carnation instant breakfast or Ensure-type of drinks if you're looking for extra calories and he can stomach them. I am picky but don't mind the taste of those.
28 Year old Female
Diagnosed with Crohn's Colitis March 2000
Recent possible diagnosis of IBS-D
Tried Meds: Asacol, Remicade, 6mp, Humira, Xifaxan, Apriso, Rowasa Enemas.
Currently on: 25mg Prednisone (Tapering SLOWLY from 60), 125mg Imuran, Psyllium Seed Powder, Colocort Enemas, Prenatal Vitamin, Vitamin B 12 Complex, Vitamin D/Calcium, Vesicare (for urinary retention).