Hello, since I started taking Levothyroxine my weight has increased so that I am now 2 stone heavier than my normal weight despite the fact that I eat very carefully and walk my two dogs for at least an hour and a half every day up some very steep hills. I believe my weight gain is caused by the Levothyroxine. Has anyone else found they have gained weight since starting to take Levothyroxine? My current dose is 75mcg. I'd really appreciate hearing others views on this.