who is the 2000 calorie diet based on

I believe that the 2000 calories is set as a woman of a certain height and weight (probably based on the average woman who is lightly active and in the middle of a healthy weight range, just guessing) which is why it's only a guideline as everyone is different. Men have the 2500 calorie guideline, but akin to the women, some need more and some need less- it's determined on your height/weight/activity level.

My Dr wants me to eat 1980 per day. I struggle to get that low. I am normally at 2150-2400 per day. I have been losing weight though. I have PCOS so weight loss will definitely be a struggle for me. Whenever I start a new workout regime my weight loss stalls for about 2 months and then the pounds start to come off slowly. As I lose weight I think she will lower the number of calories and I will not be surprised I have quite a bit of weight that needs to come off before she will let me off meds. honestly, that's the only reason I am trying to lose weight to get off the meds. I am 6'0'' tall. I also think my height has a lot to do with it. My job is very sedentary so I dance 2-3 times per week and do yoga 1 time each week.