Immune System and Inflammation

Fast food has also been found to negatively affect our immune system. What we eat affects our gut microbiome which interacts with our immune cells within our gut. Our overindulgence of fast food consisting of mainly fat, salt, and sugar has been shown in some studies to cause inflammation and poor immune function.

Healthy Inflammation Response

Fast-food diets are generally high in fat and low in fiber, which can throw off your microbiome balance. This may reduce the growth of good bacteria that produce beneficial short-chain acids like butyrate, known to play a role in supporting a healthy inflammation response. For example, a small study put South Africans on a “Westernized” fast-food diet and Americans on a high fiber diet similar to South Africans for two weeks. The results showed that butyrate levels were cut in half for the South African group and for the American group the butyrate levels nearly doubled.

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