Larger-than-life funnyman Jack Black has signed up for a new delivered gourmet food diet plan in a bid to wean himself off fast food dinners.

The SHALLOW HAL star has ordered a "satchel of health" to be delivered daily by California nutrition firm Sunfare, after watching Morgan Spurlock's anti-McDonald's documentary Super Size Me, in which the film-maker developed serious illnesses during 30 days of eating nothing but fast food.

Black states, "That guy (Spurlock) was onto something."

Sunfare promises clients they can loose "up to eight pounds a month eating healthy meals that you'll enjoy."

American Idol judge Randy Jackson famously used the gourmet food delivery service to shed his excess weight.