My 23 yr old daughter has a hard time gaining and keeping weight on. She is also a very picky eater, mostly chicken salas corn, things like that. We did find however that she likes chocolate Boost Plus 360 calories in plastic bottle not can, and Myoplex bars, choclate chip and chocolate brownie ones. Both I think have 290 0r 330 calories she only likes myoplex. With each meal or after she has a boost and at least twice a day has a candy bar. She also swiched from ultrase to creon and gained . When she came home froma hospital stay she was about 82 4 weeks later she had gotten up to 90lbs. Which for her was quite a bit she actually had to go out and buy new pants from girls size 12 to 14