Careful, you mention anything about one kind of calorie being different than another or anything other than purely CICO around these parts and you'll get down voted to all hell. Carbs definitely cause diabetes, and specifically carbs, when overeaten, cause weight gain. We're simply not evolved to eat anything near what we're eating in carbs as a species.  Carbs spike blood sugar, insulin gets released so the extra sugar doesn't kill you, insulin causes fat cells to gobble up the sugar, blood sugar goes down. Sugar crash then leads to hunger and overeating. Of coarse, a little self control and a little brains to not eat piles of shit carbs and this isn't a problem. Doesn't help that the USDA and others all push high carb, low fat bullshit that's lead to the shit show we've got now.