We asked this question to several psychologists we know, and here are the answers we received.
— I heard that you don’t need to take chocolate, as these are fast carbohydrates. Muesli is better or something.
— I think that there should be a lot of chocolates, and then they will last for a long time. Then there will be long carbohydrates.
— It seems to me that the task performed by chocolates is important here. This is a high-calorie energy boost during a big intellectual load. If the goal is an invigorating effect, then dark chocolate will do it better, it has a higher level of cocoa beans.
— No fanaticism is necessary, I think. And not on an empty stomach.