Anything is possible. There was a man who died because he ate a very large quanity of lollies in one evening. He was a general lolly eater as well. His pancreas packed up when faced with 2 kg at one time. He was probably a diabetic. Where the cake is concerned the same thing would apply. Is the liver and pancreas in a healthy enough state to handle it. If the liver has rebelled then you would throw up, or just feel nauseated, as the last dose of cake was the last straw. But the other vital organ, the pancreas, if in a weakened state could prove fatal. Of course people have different views as to what is too much cake.