Doctors around Australia have criticised dietary advice by celebrity chef Pete Evans who told a person diagnosed with osteoporosis to remove dairy from her diet.

Earlier this month, the paleo diet advocate held a live Facebook Q&A when someone asked whether a paleo diet could help their osteoporosis diagnosis.

Evans responded by saying he would "strongly suggest removing dairy and eating the paleo way as calcium from dairy can remove the calcium from your bones".

In further comments, the chef told the Facebook user "most doctors do not know this information".

The comments sparked outrage from doctors, including Queensland obstetrics and gynaecology specialist Brad Robinson.

Dr Robinson took to Facebook, addressing an open letter to Evans.

"You are a chef, not a doctor," the letter said.

"You are not someone who magically knows things that the sum of total generations of medical research has determined.

Professor Peter Ebeling, medical director of Osteoporosis Australia and head of medicine at Monash University, said Evans was quoting old data which said calcium might be acidic and caused bone resorption.

"We know that's not true," Dr Ebeling said. "He's absolutely wrong in this regard.

"It is important to get calcium from your diet. Dairy products are the richest sources of calcium in our diet."

Dr Robinson also slammed Evans for advising someone who took anti-cholesterol medication to cease its use, saying such advice was potentially deadly.

"Can we make a deal? You don't give medical advice and I won't tell you how to best shuck oysters. Agreed?"

The Brisbane doctor's post had more than 700 shares and more than 500 comments.

While most comments appeared to support Dr Robinson's sentiments, a number were still unconvinced.

One commenter gave their full support, writing: "Well said doctor! I hope people are more inclined to listen to your professional opinion."

Another commenter rejected the notion that Evans was uneducated on the topic of diets.

"He's not pulled his views out of thin air — they are based on his extensive reading, personal discussions with health experts and the enormous body of testimonial letters he has received from people who have experienced benefits from paleo," they wrote on Dr Robinson's Facebook post.

Channel Nine celebrity doctor Sam Hay also joined the public debate, tweeting his support for medical research.

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It is not the first time Evans has come under fire for his dietary and medical advice.

In February, his co-authored cookbook was investigated by the Federal Health Department for its recommendations to feed infants bone broth and last month he claimed sunscreen was full of poisonous chemicals.