The former cohost of the controversial weight-loss competition series shared several decades-old "receipts" intended to refute claims made by cohost Bob Harper and others.

Jillian Michaels is pushing back against claims made in Netflix’s “The Biggest Loser” documentary and said she is planning to sue.

The three-part docuseries delves into the dark side of NBC’s hit weight-loss reality series, which, for 18 seasons, subjected contestants who were overweight to a grueling 30-week competition to lose ...