After a period of malnutrition, you need to start taking small amounts of relatively low-calorie food and building up from there. It is a well-known phenomenon that eating too much calorie-packed food can be fatal. In his book The Forgotten Highlander, Alistair Urquhart records the same thing happening on the ship which transported former POWs home.
Oh wow, that is tragic. I was aware that, after being starved, you shouldn't gorge yourself, but I didn't know you could die from eating even normal portions... Thank you.