I recently started using MyFitnessPal to try to lose weight and I noticed that a particular beer I had drunk has a tremendous number of calories relative to the number of grams of carbs it contains compared to something like rice or oatmeal. This ended up being a problem for me because it made it harder for me to hit my macro goals for the day without going over my daily calorie limit.
It could be that the nutritional information is incorrect (this beer isn't from a country that I totally trust the nutritional labels for), or it could be that the person who put the nutritional information into MyFitnessPal didn't do it correctly. I do remember hearing that beer has a lot of carbs, which would seem to go against what I'm saying here.
So: Can a calorie be neither protein, carb, nor fat?