In this sense, a calorie is not a calorie - but to be precise it's more that different sources of calories have different side-effects on the body when converted INTO energy/calorie.
Now to grains (specifically wheat-based products): gluten. The single reason why people in my athletic sphere (CrossFit) avoid wheat products as a source of calories when training is because of gluten (and sometimes yeast - as it does stimulate candida growth).
Gluten can cause all sorts of problems that aren't related to the calorie intake - diseases, obesity, inflammation, etc...
(I won't cite anything here for that because the information is widely available and in many books - although there are still "studies" that would say this information is bunk)
I consume around 4-5k calories per-day as part of my training. As long as you use it, the calories aren't bad for you but the source of the calories must be clean.
Regarding fructose: http://www.alanaragonblog.com/2010/01/29/the-bitter-truth-ab... http://weightology.net/?p=434
Gluten is extremism overhyped, but sensitivity to it can be a problem.
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."
You're welcome to your own opinion, of course, I can't change that; but what you wrote is just as silly as someone saying that they hold "black/white/asian" people in very low regard.
http://www.sciencebasedmedicine.org/index.php/should-you-be-...
People just call clean, whatever they like/think is beneficial. Everything they deem harmful is unclean.
Agree on the crossfit comment.
Is the word "clean" slightly ambiguous? Sure. Is English as a natural language ambiguous? Definitely. I'm not going to go write an entire article about what "clean" means to me then reference said article every time I try to talk about "eating clean".
Your agreement with the above poster about "holding CrossFitters in very low regard" is just as childish as the statement you're agreeing with. How would you feel if I decided to belt out saying (or agreeing) that something you do which can't possibly be represented by any one generalization is something I hold in very low regard?
I'm not about to get my feelings hurt across the internet - but I promise if you do go about your life acting like that you will hurt someone's feelings.
So it's useless. Regarding Crossfit: There are some very valid reasons I think very badly about CF. It has amazing marketing and can offer a great community (though cult-like). But harms a lot of people long term > see comment above.