We're all diet conscious on this week's show, as Claire delves into the relative environmental credentials of various animal proteins to find out if feathers, fur or fins are doing the best by the earth as a protein source. And Chris looks at a health issue which has affected him personally and will affect many people in their lives, the risk of cardiovascular disease. How is it measured, what is the cause, and how it may potentially be avoided or reduced by dietary and lifestyle choices.