GoofSchmooferAre all calories created equal? Your gut microbes don’t think so.
forsenNice article but it doesn't really prove that calories are not equal. The article discusses how the calories get absorbed differently, but that doesn't mean the calories have changed or disappeared. Kind of misleading title.
In this context, calories not being same does not mean there are different kinds of calories.
However calorie source could mean how it's absorbed by your body may differ. So 100 calorie chocolate may provide your body 90 calories of energy, but 100 calorie lentil could provide your body 80calories worth of energy.