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Fad diets are a 'big risk,' Paul McKenna warns

8 January 2014 Last updated at 15:26 GMT

The TV hypnotist Paul McKenna has warned people against using fad diets to lose weight.

The self-help guru claims that diets rarely work and that obesity is primarily caused by "emotional eating."

Speaking with BBC Radio 5 live's Phil Williams, McKenna said: "It's a very big risk to take."

"They're treating the symptom. They're saying starve yourself - and you'll lose the weight. I'm saying, what drove you to put on the weight in the first place?"