This study examines how food prices and related seasonality factors affect the dietary choices of low-income farm households in rural Tanzania. The Kishapu and Mvomero districts were selected based on contrasting rainfall patterns, farming practices and economic activities. Data were collected before and after harvest in 2014, using household surveys, focus group discussions, key informant interviews and monthly market-price surveys. A linear-programming solution provides a choice-diet bundle of food items, given model constraints.