I have a friend with cancer. He is now underweight and in order to face an operation needs to put on weight. Putting on weight with carbs will feed the cancer. If he is in ketosis then (hopefully) the cancer will not be quite so happy. So, he doesn't need to worry about putting on fat. He isn't interested in putting on lean muscle - he's just interested in gaining enough weight so that they'll operate and then possibly having enough weight left on that he can do a keto diet with any more chemo and hopefully starve that f****** cancer. Does anyone have any experience, suggestions or ideas for how feasible it will be to put on weight on a keto diet?