A few things (and I could be off base here):
- You mentioned "I remember the days when I used to be 16% body fat." When were those days? What were you doing at that point to have you at 16% body fat? Realistically 16% body fat is low for women. Elite athletes are at that level and only during the on-season.
- You also mentioned you want to drop 12 pounds of body fat. Where did that number come from?
- I am a vegetarian and very into fitness. It is absolutely possible to lose fat and add muscle without animal meats. If you eat meat then I certainly recommend you use it to your advantage. Eat chicken and turkey. I eat tuna, beans, green veggies, tofu, milk products, eggs, hemp bread, tempeh, cottage cheese, etc.
With all that said, I still do not know your detailed fitness routine or detailed menu. So if you believe you are working out the proper way (mixed cardio lengths and sessions per week, hitting each muscle 1-3 times per week with strength training, not working out over an hour a day, resting 1-2 days per week) and eating the proper way (5-6 small meals per day, each meal has a carb and protein, first meal within an hour after waking, each meal thereafter every 2-3 hours, lots of water) then I suggest seeing your doctor.
But if you feel you are not doing the above to a "T" then I suggest seeking guidance from a fitness professional. I'm just hypothesizing about this. You could have destroyed your metabolism doing the Atkins. Now that you are relying mainly on carbs and non-animal meats... your body may be returning to its normal and healthy weight, it may be adding fat because your metabolism is sluggish, it may be adding fat because you are eating/working out wrong/over training, it may be adding muscle because you are eating perfect and working out great and your body is rewarding you with added muscle.
See lots of options. Sorry to ramble. I just want to cover all my bases. See the doctor if you think something is wrong. Your health is always first
