Archaeologists are interested in what people used to look like, what they ate, how they lived, what they wore, and what they died of. Subsistence is fundamental to human life and archaeologists have ways to work out what people ate. ‘How did people live?’ describes methods that they employ for gauging information about diet. How can we detect cannibalism? Do traces of opium found on a 3,500-year old vase from Cyprus indicate the existence of a drug trade? Teeth can be used to reveal where people lived, and show their migratory patterns. Archaeologists now can use chemical analysis of human bone collagen to discover much about long-term diet.