I too have been trying to regain the weight I lost after a botched surgery for Crohn's in 2015. I am 6' 2" and weigh 149 pounds. I weighed 169 before the surgery. On occasion I will regain 5 or 6 pounds, but I often have to go 2 or 3 days with just liquids. And there goes the weight I just gained. The problem is, for me at least, any advice on gaining weight for a healthy person does not apply for a person with a compromised digestive system as with Crohn's disease. I have been to dieticians who repeatedly offered advice that was just not feasible for someone with gut issues. You cannot just start stuffing your face with lots of food and expect to not pay the price..........so any advice would be appreciated.