Essentially, we have a system where wealthy farmers feed the poor crap and poor farmers feed the wealthy high-quality food.
High-quality food is better for your health.
A French poet famously referred to the aroma of certain cheeses as the ‘pieds de Dieu’—the feet of god. Just to be clear: foot odor of a particularly exalted quality, but still—foot odor.
The first thing to understand about nutritionism is that it is not the same thing as nutrition. As the "-ism" suggests, it is not a scientific subject but an ideology. Ideologies are ways of organizing large swaths of life and experience under a set of shared but unexamined assumptions. This quality makes an ideology particularly hard to see, at least while it's still exerting its hold on your culture. A reigning ideology is a little like the weather--all pervasive and so virtually impossible to escape. Still, we can try.