I have been taking levothyroxine for 25 years, my hypothyroidism was discovered when I was 2 weeks old. As soon as I hit puberty, I get fat (I was about 5 feet tall and 180 lbs). I have since had 2 kids, I am 5 foot 2 inches tall and about 197 lbs. I can't stand being fat and I can't do anything about it.