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Actually, hanging around obese people does increase your likelihood of being obese https://news.harvard.edu/gazette/story/2007/07/obesity-is-contagious/ https:

• vkou 6y ago
  There are so many correlation-and-causation problems with that study that it's very difficult to take it seriously. And from common knowledge about the world, if this effect does exist, it's not a very large one for indirect relations. [1] COVID, on the other hand, is contagious as all hell. The other thing about COVID, though, is that I don't even need to know the person who I can catch it from. [1] If your obese parents raised you, it's quite likely you'll be obese. If you and your extended family fell into poverty, and your cousins became obese, it's quite likely you will become obese, too. But subtract direct role models, direct sources of your habits, changes to your economic status, and the fact that as time goes on, you get older (And older people tend to be more obese), geographic effects (The rust belt started becoming depressed and poor over the years, which lead to obesity)... And what sort of effect is left?