Dr Gemma Newman is a senior partner in a National Health Service GP practice in the UK. For the past four years, she's seen what appear to be a series of small miracles in her Heathrow surgery.

There was the man who worked as a driver, whose licence had been revoked due to having sky-high blood pressure of 200/100mmHg. After a week, his blood pressure was normal, at 120/80. There was the perimenopausal woman, aged 48, whose mood swings and period cramps stopped and, over 10 months, she lost 9lb (4kg) – without dieting. There was a woman in her 60s whose asthma, kidney condition and Crohn's disease resolved. "She came to see me a different woman," says Newman.

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