Weight loss experiment. I was talking to a female friend of mine who is over weight by BMI standards (lower range of over weight) but not a ham or anything. She had all of the usual excuses about not being able to lose weight. I told her that weight loss doesn't happen fast and she needs to have roughly a caloric deficit of 3500 calories to lose a lb of weight. She refused to believe me and insisted she doesn't eat enough to be overweight. My BMI was on the higher side of normal. (23.9) I did a quick calculation and determined that between Starbucks drinks, lemonade and beer/wine, I was drinking about 1000 calories a day. I quit drinking any calories for 30 days and stuck to only water and caffeine free herbal tea.. I didn't change my eating habits at all. I figured that would give me a caloric deficit of 30,000 calories over a month which works out to about 8.5 lbs. As of this morning, I've lost 9 lbs and dropped to a BMI of 22.5. When I told my friend today, she said I must have  a faster metabolism than she does. Even when faced with damned near absolute proof, people still refuse to believe calories in, calories out is science.