Foods may be a trigger if the gut environment and immune system are overreacting and creating an immune response.
One 2019 study showed that feeding mice a Western-style diet contributed to skin inflammation.
Can Probiotics Improve Your Skin?

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Food is the best place to start with nourishing good gut bacteria, Johnson said.
Experts say a diet rich in probiotics, prebiotics, and fibers might be best for maintaining your skin.
2022;23(3):1105. doi:10.3390/ijms23031105