Jack Osbourne responds to online criticism after some social media users claim he is “grossly underweight.” In an Instagram video, he addresses what he describes as “body shamers” and “trolls,” insisting his current weight is the result of maintaining his health and that his appearance does not reflect an illness. Multiple outlets report that Osbourne says he has kept his weight stable since leaving the celebrity reality show “I’m A Celeb,” and he characterizes the negative comments as “insane.” He also states that he is “perfectly healthy,” pushing back against the claims that his weight loss or slimmer look indicates a health problem. The coverage is consistent in describing the same core theme: Osbourne publicly challenges commenters who criticize his body and argues that the criticism is unfounded. No outlets provide independent medical assessments or confirm the underlying health status beyond his statements.