There are many subcultures around food. It's not like the world is split between vegans and junk food addicts.
The Cheeto and McDonalds eating crowd may have crappy nutrition but they're an extreme. The other extreme is meal-preppers. They know exactly how much chicken, rice and broccoli they're eating.
There are huge communities of people who are very health conscious. Some of them focus their consciousness on science, some of them on other methods. Some of those people are vegans. Some aren't.