I also have a hard time gaining weight. To begin with, even before colitis, I only carried around 165-170. I am 6'0".
I was recently down to 145, but am back up to about 155. I think some may be due to the pred.
I try drinking ensure shakes, flax oil in my meals. I use rice pasta instead of regular pasta (for those who can't eat a lot of wheat). I make 4-5 egg omelletes with a can of tuna and some spinach. Also eat a lot of yogurt and sometimes smoothies.
Lately with Thanksgiving and all, I have ate a bit too much pie and treats...not sitting the best tho.
Doz79, on a side note, i see you and I are almost exact same in age and treatment. What type of colitis do you have and how are things going for you? Always curious to compare people in similar situations to see what works for them.
Good luck on the weight gain. It's a never ending battle for me...kind of like a savings account for a rainy day.