The document describes a framework for analyzing food systems using four levels: events, patterns and trends, underlying structures, and mental models. It provides the example of purchasing a bag of baby carrots to illustrate how this framework can be applied. Specifically, the event is buying baby carrots, the patterns/trends are year-round availability and convenience at low prices through industrial production. The underlying structures include issues like environmental and social costs not being reflected in price, reliance on cheap labor, and subsidies enabling low prices. Mental models include preferences for cheapness and convenience without considering impacts.