Its a misconception that the Masai in Kenya are in superb health. The following is taken from diseaseproof.com, which is Dr. Joel Fuhrmans blog
The Masai in Kenya eat a diet high in wild hunted meats and have the worst life expectancy in the modern world. Life expectancy is 45 years for women and 42 years for men. African researchers report that, historically, Maasai rarely lived beyond age 60. Adult mortality figures on the Kenyan Maasai show that they have a 50% chance of dying before the age of 59.2
http://www.diseaseproof.com/archives/diet-myths-do-primitive-peoples-really-live-longer.htmlAmerican Journal of Epidemiology Vol. 95, No. 1: 26-37
ATHEROSCLEROSIS IN THE MASAI
GEORGE V. MANN, ANNE SPOERRY, MARGARETE GARY and DEBRA JARASHOW
Mann, G. V. (Vanderbilt Univ. School of Medicine, Nashville, Tenn. 37203), A. Spoerry, M. Gray, and D. Jarashow. Atherosclerosis in the Masai. Am J Epidemiol 95: 26–37, 1972.–
The hearts and aortae of 50 Masai men were collected at autopsy. These pastoral people are exceptionally active and fit and they consume diets of milk and meat. The intake of animal fat exceeds that of American men. Measurements of the aorta showed extensive atherosclerosis with lipid infiltration and fibrous changes but very few complicated lesions. The coronary arteries showed intimal thickening by atherosclerosis which equaled that of old U.S. men. The Masai vessels enlarge with age to more than compensate for this disease. It is speculated that the Masai are protected from their atherosclerosis by physical fitness which causes their coronary vessels to be capacious.