TMZ reported Shannon weighed in at 365 pounds when she first started taping the series in January 2011, but she is now down to 263 pounds.
"I haven't done any surgeries ... no diet pills ... never went to the gym, but, with the show, I've been more active," she told the celebrity news website. "They have me running around and going different places ... I guess it's paying off."
"Here Comes Honey Boo Boo" airs on TLC. It is about Shannon, her daughter, child beauty pageant contestant Alana "Honey Boo Boo" Thompson, and the little girl's father, Mike "Sugar Bear" Thompson.