By eating many fruits and vegetables in place of fast food and junk food, people could avoid obesity.
Animals' taste systems are specialized for the niche they occupy in the environment. That includes us. As hunters and foragers of the dry savannah, our earliest forebears evolved a taste for important but scarce nutrients: salt and high-energy fats and sugars. That, in a nutshell, explains the widespread popularity of junk food.
A society that thinks the choice between ways of living is just a choice between equally eligible 'lifestyles' turns universities into academic cafeterias offering junk food for the mind.
School is where children spend most of their time, and it is where we lay the foundation for healthy habits. That's why New Jersey is the first state to adopt a comprehensive school nutrition policy that bans candy, soda, and other junk food.
There's tons of junk food for your mind on the Internet. You can sit there for three or 10 or 20 hours a day getting in online arguments with other people who also choose to waste their time.