I'm like you, juniorgrrl, I can pretty much tell anyone the fat and calorie content of any food on the earth! It's sad! I obsessively watch my calories (so I don't go over 1,500, which is very healthy for my weight, thank you...no I don't have an eating disorder!)
However, I do need to watch what I eat because I don't have time to exercise very much. So I make up for it with my diet. My other bad habits are procrastinating, not getting enough sleep, and my room and car are always messy.