Protein bars, protein shakes, protein bread – it seems like protein is showing up everywhere these days.  But how much of this specific nutrient is enough and what does it do anyway?  Healthy Food Guide dietitian Jess Burvill and nutritionist and mum of three Kathleen Alleaume take a closer look at the marketing of protein and discuss what realistic daily requirements are for athletes, weight watchers, older people, vegetarians and everyday folk.  Plus, they show you the healthiest sources of protein and some of the common traps to avoid when choosing protein foods.