Mineral-packed seeds — especially sunflower and pumpkin — provide lots of immune-boosting zinc and seriously fill you up. The hearty combo of plant-based protein and fiber can stave off hunger pangs later on.
Fermented foods like miso, tempeh, and sauerkraut contain probiotics, a.k.a. friendly bacteria that help boost immunity, regulate gut function, and banish bloat. Unsweetened plain Greek yogurt and skyr can provide probiotic benefits too. Choose ones that have five strains or more of bacterial cultures per 6-ounce serving.