Hi - I had this problem for many years, knowing I was eating a very healthy diet and also knowing that I wasn't eating a ton of calories. I was also pretty active for a lot of that time.
Are you using the Nutrition Tracker to see what is happening? When I started on SP I discovered that what was recommended for me was what I was already consuming, and gradually gaining weight on. In the end my Dr referred me to a Dietitian. I took some random printouts from my Tracker so that she could see what and how much I ate. She found no problem with either, except that the calories were not for me. I had a very slow metabolism. She set about rectifying that, with good results. After about 30 years of being overweight and slowly continuing to gain, I ended up at goal weight. It took 16 months to lose the first (just over) 50lb, but the slow losses are the better losses.
I suggest that if you aren't using the tracker, start doing so and weigh all of your food for increased accuracy. It is amazing how many extra calories can sneak in when you AREN'T keeping an eye on the food scales:-(
| current weight: 151.0