Unfortunately, so many things in our modern lifestyles can deplete the good flora meant to keep us healthy and active. Stress, common medications, antibiotics (both as medicine and in our food supply), antibacterial cleaners, chlorinated water, and overzealous hygiene habits can all do a number on your microbiome. Whenever possible, choose whole, organic foods and natural products and cleaners that won't negatively affect your beneficial bacteria.
No matter how many miles you log as a runner, if you are passionate about running, you will do nearly anything to keep your streak going strong. And taking care of all the microscopic friends in your gut may be the single most important step you can take to support your running practice and help you live your happiest and healthiest days.