If you drank 5 beers in 1 hour you would probably be pretty intoxicated. If you drank the same 5 beers over the course of a day then you’d be a lot better off in terms of drunkenness and body functions. The same goes for eating. If you had 5 donuts in 1 hour it would do much more harm to your body than if you ate those donuts over the course of the whole day.
Your body needs to detoxify. If you don’t give it time to detoxify then it reacts negatively. In the case of the donuts your blood sugar would skyrocket, you would be promoting more fat storage and it would cause more inflammation. Maybe next time, instead of eating 1 donut a day you can cut it into 3 pieces and eat it for dessert after every meal. Why can I not see that happening? Mmmmm.. donuts.