[theBCnut]

If you add up the numbers, a food can’t have 30% protein and 14% and less than 45% carbs, but the lower fat level is the only way you will get the calorie count you’re looking for. If you have 40% protein and 18% fat, you are going to have higher calories, since fat has double the calories of protein and carbs.

If you really want low calorie per cup, you need to use canned food, since it’s 80% water, it will have lower calories per cup.