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She had bariatric surgery in 2013 and lost 12 stone in 12 months - but during the next decade she regained four stone and started suffering painful spasms in her stomach due to side effects from previous surgeries.

Paul has type 2 diabetes, which went into remission before he underwent bariatric surgery.

Other conditions investigated, or due to be looked at, include bariatric surgery, talking therapies and diabetes prevention.

"As a physician, I find it deeply troubling when patients are shamed for using evidence-based treatments, whether anti-obesity medications or bariatric surgery," Kumar said.

A team of researchers led by Pennington Biomedical Research Center's Dr. Florina Corpodean confirmed through a data analysis that metabolic and bariatric surgery is largely safe and effective for patients who are experiencing severe obesity.