Linda Geddes: There is no strong evidence that low levels of drinking during pregnancy are harmful, and to say so risks stigmatising responsible drinkers
Matt Chittock: Gluten-free, dairy-free and other restricted diets were once for people with allergies or other medical conditions. Now many practise them voluntarily – but are they really beneficial?
The death of runner Claire Squires during the London marathon last year has been put down to the sports supplement Jack3D that she took. So should athletes avoid them altogether? Patrick Barkham investigates