You asked: Is gluten sensitivity real?

Gluten, a kind of stretchy protein found in wheat, rye and other grains, is ubiquitous in processed food products because of its handy binding properties. That makes it hard to avoid. But who, exactly, needs to follow a gluten-free diet?

Certainly people who have celiac disease—roughly 1% of the population—since eating gluten triggers an intestine-damaging immune system response. It's also a no-no for people who are allergic to wheat.