>So basically, avoid fun whenever possible.

I have fun studying a new topic.

Learning a new language.

Reading a book.

Learning a new skill.

Playing sports.

So, according to you and your suggestion I should avoid all those things in order to have greater chances of avoiding alzheimers and dementia.

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The only things that came up to your mind when thinking of "having fun" and "enjoying yourself" were self destructive habits, such as drinking, overeating and eating unhealthy food.

My point stands. You're definitely the wrong person to be around.