Because it's too obvious. There needs to be some hidden, world encompassing conspiracy, so that people feel superior when they are one of the few enlightened ones that see through the matrix and start drinking raw milk to live like our testosterone pumped ancestors.
If you are a podcast host that gives hot takes on news headlines, which one are you going to choose?
Option one: obesity and weight problems. Statistically 77% of your audience is either overweight or obese because 77% of Americans are either overweight or obese.
Option two: feminism, microplastics, anime, or literally any other thing than option one.