Pratt, 37, has been posting a series of videos on Instagram called "What's My Snack" during which he shows fans what he is eating while on set of the sequel to "Jurassic World".
But some followers commented on the latest edition that the actor looks 'skeletal' in the clip.
"So many people have said I look too thin in my recent episodes of #WHATSMYSNACK. Some have gone as far as to say I look 'skeletal'. Well, just because I am a male doesn't mean I'm impervious to your whispers. Body shaming hurts.