Many blame the media, and some are saying Peaches is attention seeking.
The scarlet was spotted out and about shopping in London last week, showing off her tiny frame in a short, figure hugging dress, and looking slightly paler than usual.
She is thought to have lost close to one-and-a-half-stone since March, slimming from 10st to just 8 st 7.
The public appearence prompted fears the famous child of Bob Geldof has taken her diet too far.
Controverial Peaches hit back at the talk from critics on Twitter, saying: I eat more healthily now. That’s it. Obviously I’m going to look thinner if i don’t sit around eating pizza and chips.
Its just how the body works. You are a product of what you eat.’
The 22-year-old credited ‘Lots of fresh fruit and veg and no bread/wheat for her new shape.