Need help with weight gain

I would suggest nut butters.

Agree with both of the above. I'd add you should also use protein powders and meal replacement shakes you find in body building sections of health food or drug stores. A whey protein or egg white protein would be preferrable over soy. Eat small, frequent meals rather than a few large meals. Five or six meals/snacks a day is ideal. You want to keep the body constantly fueled and you may need WAY more calories than you think if you're a natural ectomorph AND you have UC. Ectos have a high metabolism and have trouble gaining weight or putting on muscle mass. UC means you may have too fast transit time and your gut's not properly absorbing nutrients, so it's a double whammy.

You don't mention if you work out or not, but a heavy weight training program is key in putting on muscle mass, as opposed to just gaining fat. Ectos benefit from slow, heavy training, once or twice a week per body part, and cardio should be reduced or eliminated until you get back up to your target weight. I highly recommend the Gaining Mass program, designed specifically for ectomorphs. It transformed me. http://fastmusclegain.com/

My experience is that I lost weight not only because of the blood diarrhear, but also because of the intake function. I do not have as much food as before UC due to lack of appetite or stomachache. Less food, bad sleeping, intake malfunction, UC's complication may be the reason. What I did was to chew/have food slowly, do (proper) exercise, try to sleep more. Good luck.

lots of good advice. haven't heard about olive oil but i have some so i think i will start with that. anyone tried cytogainer?, has 900 colories per serving if mixed with milk

Olive oil is a source of healthy fat and can help you get your calorie intake up. Other sources are fish, flax and Udo's oil. I often add olive or flax oil to a bowl of soup or stew for lunch.