Matt Willis thinks he looks like a "fat mess" in his wedding pictures.

Matt and Emma Willis

Matt and Emma Willis

The Busted singer married 'Celebrity Big Brother' presenter Emma Willis in 2008 but he has admitted he can't bear to look back on his special day because he thought he looked horrific in the shots.

Asked when he decided to get in shape, he said: "I got married and I hated myself in the wedding pictures. I looked like a fat mess. I'd had a problem with drink and rugs and I stopped all that. But I still looked bad a year later. Then I realised, 'Oh, it's probably because I'm eating fried chicken and drinking things with loads of sugar in it. Once I started taking care of nutrition, it all clicked. I've got a bad relationship with food. I'm very obsessive about it."

But he believes his particular downfall is sugar because he can't stop gorging on sweet snacks once he starts and he finds his whole personality switches as a result of his insulin spike.

He explained: "I've learnt that I'm not very good at moderation. It doesn't work for me. Anything that can be taken too far, I'll take too far. Sugar is the worst. If I have it, something triggers in my brain... the same as it does with any other mind-altering substance.

"Something happens to me and I become a monster with it - I can't control myself, which is ridiculous and I hate it. But it's just something about me, which I've had to learn."

The 33-year-old star tries to stay away from sugar at all costs but does treat himself to a few squares of dark chocolate occasionally so he's not depriving himself.

He added to Men's Fitness magazine: "I do have a bit of dark chocolate every now and again. I'm wild, aren't I?"