Successful Men Never Drink Canned Coffees

I found an interesting book. The title is "Successful men never drink canned coffees".
This book says that these days people tend to be short of  protein and take sugar too much, which affects the efficiency in our work.
If you drink a canned coffee,you can feel refreshed but after that you may feel sleepy or dazed, sometimes become unmotivated. This isn't because of your lack of motivation, but related to a medical truth.
After drinking it, the sugar  in it boosts your blood-sugar level and your pancreas expels a lot of insulin to lower it.Then you feel sleepy or boredom. It means, you should choose sugarless coffee.
 The title is a little bit exaggerated. However what this book says is apparently true. Nowadays we tend to take a lot of sugar more than protein through a sweetened buns, rice balls and noodles which are easy to eat in our busy days. But protein is very important for brain work. In short, before an important meeting, you should not eat rice balls, noddles.
From now on, I try not to take these foods so much.