No, he's never practised as a doctor. He studied PPE at Oxford and then studied medicine, because he wanted to be a psychiatrist.
I bought one of his low sugar diet books and it was a total waste of money. I could have written it myself and I've never even studied medicine. It went in the bin. Sorry!
Retiring and living frugally in money from downsizing after years of stress


as there have been put forward many reasons why even a 'varied' diet might not result in a good intake of vitamins and mineral (don't forget the mineral BTW) 