If you've been diagnosed with coeliac disease, skipping gluten isn't a trend – it's a medical must.  But for everyone else who swears they're "gluten sensitive" or "intolerant", is gluten really the villain it's made out to be? According to a new research review published in The Lancet, your gluten sensitivity could actually be something else entirely. So why do so many people feel better when they cut gluten from their diet?