Hi! Im 37, I have been living with my Dx since 2010. I recently was underactive thyroid again, and increased dose from 75mcg to. Ow 100mcg of Levothyroxine. I gained weight due to hypothyrois for the first time this year, 10lbs. I am a very active mom, my life busy all day but I also exercise 3-5 times a week. Some of those workouts are runs and some arenintense interval training- which is great exercise! I haven't been able to lose a single pound!!! I eat generally healthy, no junk food all homemade foods, no frozen or boxed meals, except the weekend cheat meal. Ive been actively working on losing weight since August and not one pound!! So frustrated!