Diet swap: John was fat and ill as a vegan, left, but is now the picture of health as a meat eater, right
As the kitchen filled with the smell of caramelised meat, my mouth watered in anticipation of the coming feast: a thick cut of tender steak, fried in butter and olive oil.
This was not a regular treat. In fact, for the previous 26 years I'd been a vegan, eschewing not just meat but all animal products.
My diet was an extreme version of the NHS Eat Well regime, which recommends lots of starchy foods and smaller quantities of saturated fats, cholesterol, sugar and red meat.
According to government advice, I was doing everything right — and yet my health had never been worse. My weight had crept up over the years, until in 2008 I was 14½ stone — which is a lot of blubber for someone who is 5ft 10in — and was classified as clinically obese.
I waddled around, sweating and short of breath, battling extremely high cholesterol and suffering from chronic indigestion. I was always tired and needed to take naps every afternoon. I had constant headaches and swallowed paracetamol and sucked Rennies like they were sweets.
Worst of all, I had irritable bowel syndrome (IBS), which left me feeling as if I had lead weights in my gut. My belly was bloated and distended after every meal. I was, to use a technical term, knackered.
But that was about to change. In 2010, I decided to give up my supposedly healthy lifestyle and embrace good old-fashioned meat.
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