Bashing HFCS is silly, in my mind. It contains the same components of regular table sugar - fructose and glucose, in only minimally different proportions. HFCS is usually 55% fructose/45% glucose while sucrose is obviously 50/50. Also, because HFCS is a liquid component that carries water, it actually contains less kcal/gram than regular table sugar.
It is cheaper and easier to handle than regular sugar, however - and thus a large reason for its prevalence today. If everything had the same amount of sucrose in it, it would be causing the same effects.
Blaming HFCS for people being fat is like blaming weapons for injuries. It's user control and error.
The white flour thing puzzles me as well. It's mainly starch, which we all know are long chains of saccharides. Aren't we brewers? This is the same things that are in malt - hell, we brew with wheat on a regular basis, don't we? To say you won't eat white flour but you drink beer is rather confusing.
Now, I agree that an excess of sugar, processed foods, starches, etc. are bad - that's what I've already stated claim of shopping on the perimeter of the grocery store. It's about moderation in consumption, and some exercise to regulate body homeostasis, plain and simple.