I guess it depends on your culture what the "standard" diet is. I don't think my diet is particularly extreme.

The one that has white flour/rice and sugar as the main staples. You know what I mean; it's cross-cultural now, like tobacco smoking.

The diets in the "Blue Zones" feature those as staples as well. I somehow don't think that they're terribly unhealthy. Grains have been staples for millennia by now.

The bread we eat now and the bread we ate 150 years ago are very different breads.

The modern stuff is refined flour and sugar.