Traditionally, the Maasai diet consisted of raw meat, raw milk, and raw blood from cattle.
According to Dr. Anderson from the local government hospital in Kenya most tribes were disease-free. Many had not a single tooth attacked by dental caries nor a single malformed dental arch. In particular the Maasai had a very low 0.4% of bone caries. He attributed that to their diet consisting of (in order of volume) raw milk, raw blood, raw meat and some vegetables and fruits, although in many villages they do not eat any fruit or vegetables at all. He noted that when available every growing child and every pregnant or lactating woman would receive a daily ration of raw blood.
Electrocardiogram tests applied to 400 young adult male Maasai found no evidence whatsoever of heart disease, abnormalities or malfunction. Further study with carbon-14 tracers showed that the average cholesterol level was about 50 percent of that of an average American. These findings were ascribed to the amazing fitness of morans, which was evaluated as "Olympic standard".
From the journal Atherosclerosis:
A field survey of 400 Masai men and additional women and children in Tanganyika indicates little or no clinical or chemical evidence for atherosclerosis. Despite a long continued diet of exclusively meat and milk the men have low levels of serum cholesterol and no evidence for arteriosclerotic heart disease. The reasons for this disagreement with the popular hypothesis relating animal fat intake to coronary disease are examined. The authors concede that some overriding protective mechanism
such as freedom from emotional stress or abundance of physical exercise may be present. They favor the conclusion that diet fat is not responsible for coronary disease.