Fat does have more calories per gram than sugar, but I think sugar has more calories per cubic centimeter. (Not that I think that this one is the reason why it is more pleasurable to eat sugar than fat for most people.)
Sugar crystal is about 1.5 grams per ml, while human fat is about .9 grams per ml, but fat has more than twice the calories per gram.
Fat does have more calories per gram than sugar, but I think sugar has more calories per cubic centimeter. (Not that I think that this one is the reason why it is more pleasurable to eat sugar than fat for most people.)
Sugar crystal is about 1.5 grams per ml, while human fat is about .9 grams per ml, but fat has more than twice the calories per gram.