Different people have different metabolisms. Some will do better with more or less of each food category. Some feel better on veggies exclusively, some feel crummy without a generous serving of meat. If X works for you, great.
The problem is those of any culinary persuasion who guilt-trip others for not adhering to a diet they don’t like (or, as in my case, doesn’t like them - I like salads, but my medicine would be near-unmanageable if I ate it). When the plan is for government to _compel_ a particular diet, a revolt is in order.