5. Kefir
If you have ever been to the health food section in your grocery store, you may have seen kefir in the refrigerated section near the yogurts. Kefir is a probiotic style of product/beverage that is one of the best options for reducing stress and anxiety from your life. Kefir is surprisingly a great option for increasing the amount of free floating serotonin in the body. In addition, any kind of bacterial imbalance in your intestines can cause your brain chemistry to be off, and this can be easily remedied by consuming kefir more often.