> If you want to know why there's a health problem in some developed countries, the confidence of all the factions in the back and forth in this thread is a shining example.

I think you might be extrapolating from your experience with your own social class. I can assure you that armchair nutritionistism is not the biggest problem for the majority of the country. Nutrition isn't on most people's minds--even people whose lives are imminently threatened by their nutritional habits.