70%-90% of immune system function occurs in the gastrointestinal tract, and is dependent on balance between beneficial bacteria, and harmful bacteria. Antibiotics wipe out all types of bacteria, and it is essential to reseed the GI tract with the “good” bacteria (probiotics) after taking antibiotics to avoid dysbiosis (imbalance). Non-pasteurized, fermented or cultured foods are a great natural source of probiotics (think fresh, sauerkraut, kimchi, Miso, or Tempeh). Probiotic supplements with multiple strains and up to 15 Billion units are also now available. To maximize health add probiotics to your healthy diet, especially after taking antibiotics, or if exposed to antibiotics through secondary sources such as non-organic meats, or antibacterial hand soap.
Also use prebiotics. Prebiotics are foods that create a healthy environment for probiotics, and include foods such as asparagus, bananas, legumes, honey, artichokes, oatmeal, and red wine. In general, most fiber-based foods like fruits and veggies help create a nourishing environment in which probiotics can thrive. To maximize health, add prebiotics to your healthy diet.