This episode of The Confidence Interval features a recording of the Festival of Ideas event "Improving our Diets - More Freedom or More Control?". Governments try to improve our diets by labelling, taxes and manipulating what shops are on the high street. The right approach is not just a matter of what works, but involves questions about government and personal rights and responsibilities. Public health and policy experts explore the role of evidence and ethics in helping us decide how and when to intervene.