ariel taylor answered question 1/9/2011 I Have Been Diagnosed With Underactive Thyroid And I Take Levothyroxine. I Am So Hungry All The Time And Keep Gaining Weight! Is There Something That Is Safe For Folks With Thyroid Issues To Take To Control The Appetite? I'm also on Levothyroxine seroquel XR and Atenolol I really don't know what one causes my weight gain but to curve your hunger get some small bottles of juice to drink it some times helps me!