I am getting a good supply of food, making dinner etc. I do see dwarfs eat. But then I see one die, or is going to, with it food bar close to zerro and 50 rations still in place.. Is there a special need or is this random? When you implement the dwarfs view it would be grade if you can get a warning or sort the list to see if there are problems..
When they're "broken" due to unhappiness they don't eat or drink anymore which might be what you're seeing. If they're otherwise sane they should always eat any food available before starving though (well, except that they don't share rations)