Suzi Gage: A recent study has shown that having a BMI classed as overweight is associated with a lower risk of mortality than one classed as ideal. But what does this mean?
Linda Geddes: There is no strong evidence that low levels of drinking during pregnancy are harmful, and to say so risks stigmatising responsible drinkers
From a fork that tells you when you're eating too fast to a skin patch that constantly monitors your vital signs, there was plenty of exciting kit on show in Las Vegas