Celebrity Fit Club may face legal action from Muller after claiming that its diet yoghurts are full of sugar.

Show nutritionist Adam Carey is also said to have provided incorrect fat levels in an episode broadcast on January 31.

Dr. Carey told contestant Geoff Rudom, "It's 1.6 per cent of the product that's fat. But 55 per cent of the calories from this product come from sugar."

A spokesperson for the firm told The Mirror, "Mullerlight 200g contains no table sugar - sucrose - and only 0.1 per cent fat rather than the 1.6 per cent claimed."

The company is considering legal action and has demanded a retraction from the show, which attracts 4 million viewers.

An ITV spokesman confirmed, "A complaint has been received and we are investigating."