If you want to boost immunity, look to the gut
More than 70% of the immunoglobulin A in the human body is produced by the intestinal tract, and more than 70% of the immune cells, such as macrophages, T cells, NK cells, B cells, etc., are concentrated in the intestinal tract. As the first line of defense, the immune cells inside are the second line of defense. ... nutritionists emphasize that in order to maintain intestinal health, one must have good healthy eating habits and work and rest, or ingest live bacteria that are beneficial to human intestinal health, improve the intestinal microecological balance, and prevent intestinal diseases.
https://connect.uclahealth.org/2021/03/19/want-to-boost-immunity-look-to-the-gut/
Food digested process
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