Another take on the Paleolithic diet.

Ms Garton looked for inspiration to the plant-based diet of our closest relatives, the apes, and devised a three-day rotating menu of fruit, vegetables, nuts and honey. The prescribed menu was:

• safe to eat raw;
• met adult human daily nutritional requirements; and
• provided 2,300 calories – between the 2,000 recommended for women and 2,500 for men,

Volunteers could also drink water. In the second week, standard portions of cooked oily fish were introduced – a nod to a more hunter-gatherer lifestyle.