Earlier quoted context omitted.
A colorie is a calorie (in the sense that a unit of energy is a unit of energy); however, there are some (I don't have science to cite, so I won't say it is factual) people that say fructose is worse for you than glucose (the two monosaccharides). Here's an interesting article you can read: http://www.eatingrules.com/2011/05/introduction-to-sugar/ In this sense, a calorie is not a calorie - but to be precise it's mor…
Oh god. What the hell does "clean" mean. That's orthorexic nonsense. Unprocessed foods can be very helpful, but they aren't magically different kcal, If you eat too much potatoes and nuts (instead of cake) you'll still gain the same amount of fat (controlling for fiber and protein energy loss). http://www.wannabebig.com/diet-and-nutrition/the-dirt-on-cle... Regarding fructose: http://www.alanaragonblog.com/2010/01/29…
I think the point of the article is that it is easier to overeat processed foods (such as cake) than unprocessed ones (such as potatoes and nuts) because the former are engineered to not trigger your brain's sense of satiety.
Aside from that, I'm a bodybuilder and I hold CrossFitters in very low regard - but the comment you are responding to is correct in the sense that "clean" foods make it easier to manage one's weight, even though "a calorie is just a calorie."