I won't go into all the detail, but basically I started a low carb diet because I was showing signs of glucose intolerance. I was always a very high carb diet, normal weight despite this. When I changed my diet, I lost 15 pounds quickly. I haven't had my period since that time (5 months ago). I am 43 years old. Of course, my doc did tons of lab work and it came back showing hypothyroid. No real symptoms despite the numbers. Everything I read is that if you have a sluggish thyroid, high-intense cardio workouts are not good. I feel the best I ever have but if these numbers don't improve, I am looking at medication. Anyone else in this boat? I only exercise 30-45 min per day but I was told to cut back to 2-3 days per week. On a positive note, my glucose numbers and A1C look fantastic.