LONDON — Gwyneth Paltrow is happy for her two children to play in dirt and mud because it is important for them to build up their immune system. The ‘Iron Man' actress realizes she cannot shelter daughter Apple, eight, and son Moses, six - her children with her husband, Coldplay singer Chris Martin — from germs and actually thinks it is beneficial for kids to be exposed to muck. In an interview with Britain's OK! magazine, she revealed: “When they get home from school, I ask them to wash their hands but I think it's good for them to be in dirt and germs because that's how you build an immune system — by getting sick. “I mean, if someone has the flu, I don't put my kid in their face, but it's an inevitable fact of life.” After starring in 2011's ‘Contagion' as a woman who contracts a deadly disease, Gwyneth realized she was borderline OCD (Obsessive Compulsive Disorder), describing herself as a constant “hand washer”, but she has now seemingly had a change of heart. Gwyneth, 39, also used to follow a macrobiotic diet but now eats a more varied menu which includes poultry and fish. — Agencies