Former private chef Edit Whitelaw had battled unsuccessfully to keep her weight in check for more than 30 years.

The 157cm self-confessed sugar addict had tried everything in that time, from diet pills to the protein-fuelled Atkins diet, all to no avail.

The turning point finally came last year after reading about the remarkable body transformation of Silicon Valley multimillionaire Dave Asprey in his best-selling book The Bulletproof Diet.