There may be other reasons why they are not eating though. I stopped eating about a year ago when I was diagnosed with bowel cancer. I physically couldn't eat. Anything I ate, even the slightest bit, made me feel ill. It was the easiest way to combat it, I can't feel ill if I dont eat. I lost a lot of weight (got to 7 stone then got made to eat and put on special diets ect). Once you get into that kind of routine, its very very difficult to get back to normal, and things start to escallate. It was only because of the support the doctors, my family and friends gave me, that I started to eat again. Maybe ask them to get checked out by a doctor, as they will be able to advise a nutritionalist who will be able to help much more.