Seaweed and sleep... slimline Jamie's secrets: Chef reveals how he turned focus on his own well-being to lose weight ahead of his 40th birthday

He has spent years campaigning to rid the nation of Turkey Twizzlers.

Now Jamie Oliver is tackling his own health, after claiming to have adopted a new food and lifestyle regime designed to increase his energy and help him lose weight.

The 40-year-old TV chef, who has previously admitted surviving on just three and a half hours sleep a night, said he now goes to sleep at 10pm, has given up alcohol during the week and regularly eats seaweed, nuts, eggs and herbs.

Scroll down for video 

Weighty issues: A career in food takes its toll in 2010 (left) and Jamie Oliver celebrating his 40th birthday (right) after adopting a new regime designed to increase his energy and help him lose weight

‘Sleep has become profoundly important to me,’ he told the Radio Times. ‘I was never getting enough of it and I didn’t understand the value of it. And I treat it like work. Just like I do with little Buddy [his four-year-old son] when I tell him to get to bed, I get to bed! I have little vibrating things that shake me when it’s 10pm.’

He added: ‘Your average Brit drinks booze. I’m not telling you what to do, but my rhythm now is only to drink at the weekend. It’s about a consciousness and knowing you’re doing something and being more mindful.’