There are some research on mice[0] with the ketogenic diet (usually you go in ketosis state if you are fasting). [0] -- Ketogenic diet activates protective γδ

There are some research on mice[0] with the ketogenic diet (usually you go in ketosis state if you are fasting). [0] -- Ketogenic diet activates protective γδ T cell responses against influenza virus infection https://www.science.org/doi/abs/10.1126/sciimmunol.aav2026 https://www.science.org/doi/abs/10.1126/sciimmunol.aav2026