Because BMI 25.0 is actually really fucking generous for anyone who doesn't regularly do weight training. A couple years ago, I was doing 2hrs of legit cardio 5 times a week with a bmi staying in the 25-26 range. And I looked fat as fuck. I felt fat - although I didn't know it at the time (nothing to compare to). I was also pretty slow and awkward in sporting events.  15 weeks of calorie counting later, holding the exercise constant - I was down 30lbs and running 5:20 miles. I felt like a new person. It's the best I've ever felt in my entire life. I'd spring out of bed at 6 in the morning just because being awake felt so fucking awesome. I'd do extra runs because running without bouncing moobs was an amazing feeling. It's been over 3 years and the feeling still hasn't worn off. Again, if your BMI is 25, and you aren't doing weight training several times a week, you are indisputably FAT.