In Tanzania the people of the Hadza community have a diet that consists of the animals they kill, honey, berries and whatever grows wild. They eat what may be considered a true hunter-gatherer diet. In studying this group scientists have discovered that their gut bacteria undergoes different annual changes. Some of their microbes completely disappear only to return at another time of the year along with the change in diet. The study was conducted by the Max Plank Institute for Evolutionary Anthropology. Stool samples were compared with Italians from Bologna. The Hadza hosted much more abundant and rarer forms of gut microbial species. This led researchers to collect samples four times a year to see if the composition varied. There were extreme differences in the samples taken during the wet season as opposed to the dry season. This discovery is new for any human microbiome. The seasonal change in their diet lead to a predictable change in their gut bacteria. The composition is more similar to traditional older societies than to modernized industrial diets. Since industrialized nations eat the same foods year round, a clue to the rise in disease because of the loss of certain strains of bacteria may be the reason. This can be of significant value in possibly decreasing the causes of inflammation in the body, a source of chronic illnesses in our society. This would encourage us to explore more deeply the suggestion of a rotation of diet.