This is misleading. I followed that 30% number to her citation, which was a Wikipedia article, and then followed the footnote, to this article (graciously supplied in full by someone really kind!) In the western world, 30% of people have non-specific abdominal complaints, not fructose malabsorption! The fructose malabsorption number may be a lot higher than people think it is, but it's not 1/3 of the population! The article covered all carbohydrate malabsorption, including lactose intolerance, which is much better documented.

I do not think this is a reason for MOST people to stop eating fruits and vegetables! The blogger herself cites the famous orthorexia essay. I'm glad she figured out her own situation, but I don't think that means the rest of us need to stop eating broccoli. (Unless it upsets your stomach, I mean!)