Picture: Getty Images

Gwyneth Paltrow controls her children's diets because her son has eczema.

The 40-year-old actress has hit back at her critics for calling her a "bad mum" after she recently revealed that her daughter Apple, eight, and son Moses, seven, have gluten- and dairy-free diets but she insists it is only because he suffers with inflamed and irritated skin.

RELATED: Critics slam Gwyneth's cookbook

The blonde beauty, who released her new healthy eating cookbook It's All Good last week, said: "What it is, is that my son [Moses] has very bad eczema and he's allergic to gluten and he's allergic to cow dairy.

"I try at home to make everything gluten-free for him because the difference in his comfort is unbelievable when he's sticking to what he's meant to be eating."

The Iron Man 3 star, who is married to Coldplay frontman Chris Martin, said their children are very normal and enjoy occasional treats.

She told Dr Mehmet Oz on The Dr. Oz Show: "I don't know where they get some of this stuff.

"They say I don't give my kids carbs, and I'm feeding them seaweed ... I have no idea. But they eat Oreos, too, and they're normal kids."

Gwyneth recently revealed she treats her children with a "Coke of the week" to give them a break from their healthy-eating regime.

She said: "They love a brown rice stir-fry, but they also love their 'Coke of the week'.

"My daughter gravitates toward fresh fruit and raw nuts but will inhale a bag of hot Cheetos at the airport. It's all about balance.

"I try to make sure that what is on their plate at home is nutritious and tasty, and then I loosen way up on the reigns when we are out."

The West Australian

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