To be honest, 'why, in the century in which most people had cheap, reliable food sources and motorised transport for the first time in history and many stopped doing manual labour did obesity start going up in many countries where people benefited from these changes?' doesn't seem like a question likely to have an especially counterintuitive answer. Ice cream may have existed in various forms for centuries, but the average person didn't eat 20L of the stuff every year before effective and near-universal refrigeration. (The same blog dismissed the standard claims around less healthy refined foods and people not needing as many calories because they lived more sedentary lifestyles anyway...)

I'm sure there are individuals with metabolic issues that aren't related to their diet and it's not impossible that the "contaminants" this blog is obsessed with play some role. But I also think that sunspot activity plays some role in climate, and I wouldn't expect to stunning breakthroughs in sunspot science from a climate-skeptic blog motivated primarily with proving that the major step change over the last century that's consistent with the theory and the data can't possibly have made much of a difference...