Chewing gum helps me memorize English words!?

Professional baseball players often chew gum while playing. In the past, a lot of Japanese people would consider it to be rude. In contrast, these days, people are encouraged to chew gum even in circumstances where people weren't previously allowed to do it.

In the past decade, it has been said that people should try to increase the amount of time they spend chewing things as much as possible. Under these circumstances, chewing gum is viewed as a good way to make it happen. On top of that, you are strongly advised to make efforts to chew as many times as possible while eating. As you may know, it prevents overeating and helps to enhance digestion and absorption. Other than that, it has been recently highlighted that chewing things is effective in activating brain functions. In fact, a survey has shown that students in the University of Tokyo, the most prestigious university in Japan, tend to have a habit of chewing more. Many surveys have shown that people can memorize things better while they are chewing things like gum than people who don't. The effect is more obvious on elderly people than young ones. 

According to the news, various scientific evidence for the relevance between chewing things and brain activation have been discovered. Some elderly patients who were on feeding tubes demonstrate how important chewing things is for human beings. When they were on feeding tubes, they weren't able to walk. Some of them were even unable to talk. However, after removing the tubes and letting them eat normal food, they regained the ability to walk and talk. All of them could get many functions back to normal.

In nature, being unable to chew things means death for animals. So, there is no wonder that chewing things is essential for us.