Only on the maintainers forum! Thank you, cshepard for asking ME how to GAIN weight. That is ironic for someone who used to weigh 343 pounds. To answer: I knew I was too thin when my rear end was so bony that I was uncomfortable in the metal chairs at meetings at work. And I increased calories to gain my weight back. I was careful to make them nutrition packed calories: flaxseed oil, chia seeds in dressings, etc. I avoided 'cheat days' because I tend to binge on flour and sugar. I always think, "I promise. I'll have just one this time." But that 'one' turns into the entire bag, or loaf, or half gallon.