The sort of diet, that thousands of obese women go on in January.
They will often be heard to ask. "How may calories have burnt whilst strolling the 0.3 miles to the chippie?"
Women who go on piets, are doomed to remain fat munters for the rest of their miserable lives.
"where is the remote, oh fat one?" "It's under my tit, time to go on a piet... The phone hasnt turned up yet either.