Peter Andre admitted that he has no appetite since finding out his brother has cancer.
The reality star's brother Andrew is battling kidney cancer and he is staying with Pete in the UK while he undergoes chemotherapy.
The 39-year-old told Now magazine: "I tend to fluctuate between 11st and 11.5st.
"It's the case that, when things are bad with Andrew, I have no appetite.
"But then when he's feeling better, I go back to normal. It's not about me though, it's about him!"
Journalist Dan Wootton, a friend of Andre's, has admitted he is worried about the singer's welfare.
Dan said: "Friends tell me he's dropped at least a stone and they fear his body's in the same gaunt, fragile state it was after he split with Katie Price, when he lost 3st through stress.
"Some days Pete simply can't face eating.
"Despite this, he's still obsessively exercising because it's the only way he can release the anger he feels inside."
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