The common food among the Tutsi included beans, corn, peas, millet, sorghum, cassava, sweet potatoes, and bananas. Within their diets they receive carbohydrates, vitamins, minerals, that are provided by fruits and vegetables. They receive very little fat and protein. Due to this lack of protein a disease called kwashiorkor is common.
The Tutsi have several traditions regarding certain foods. An example is the sacredness of cows. They can only drink their milk on occasion, and they are only consumed when the cow dies on its own.They then bury the horns of the cow to bring good luck. They also drink beer in times of celebration such as weddings.
References:
Stanford, E Leanor
2012 Culture of Burundi. Electronic document,
http://www.everyculture.com/Bo-Co/Burundi.html#b