More than half of the functioning and mechanisms for the immune system are located in the stomach, which makes our diet such a crucial part of our immune health. Ensuring that your gut is well-protected and doing all that it can to support the immune system is also important. Yogurt is rich in probiotics, which can promote a healthy and efficient microflora environment in our stomach. If we are digesting food smoothly and absorbing nutrients effectively, then our immune system has a much better chance of fending off any potential infections.