The reason is that it is their religious belief not to eat pork.

Masai is a people in sub-Saharan Africa. They believe in Islam, so it is their religious belief and cultural tradition not to eat pork. In Islam, pigs are regarded as unclean animals and are forbidden to eat.

Masai people follow the teachings of Islam, strictly abide by food taboos, do not eat pork, and do not eat other prohibited foods and drinks, such as alcohol and tobacco. This is part of their religious beliefs and cultural traditions.