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There are things our bodies do so often and so automatically that we barely notice them. Yawning, growling stomachs, and runny noses are good examples. Each is a universal part of our daily human experience — but did you ever wonder why?

Keeping the gut microbiome diverse is good for health and may even be tied to healthier aging. To maintain such diversity, it helps to eat a healthy diet that includes lots of fiber, which gut microbes eat. Also, exercise may be helpful to the gut microbiome, since exercise may change the rate at which material moves through the intestines. Other ways to promote a healthy gut microbiome including getting a dog, which exposes us to more microbes; quitting smoking, which relieves stress on gut microbes; and maybe eating more probiotic-rich foods, which may boost beneficial bacteria in the gut.

More than half of US adults over 60 have diverticulosis, a condition where part of the wall of the colon bulges outward and forms tiny pouches. Diverticulosis does not cause symptoms, but if a pouch becomes inflamed or infected it becomes diverticulitis, which can be mild or more serious.

One reason people eat yogurt is because it contains probiotics — beneficial bacteria and yeasts that improve digestion, provide protection from dangerous organisms, and boost the immune system. But not everyone likes the taste or texture of yogurt, so here are some other foods that offer the same benefits.

Irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD) are different, though they can have similar symptoms. IBS symptoms seem to arise from hypersensitive nerves and abnormal muscle contractions in the digestive tract, while IBD results from a problem with the immune system causing inflammation.

Some types of cheese, including Swiss and Gouda, are a good source of probiotics, but eat cheese in moderation.

A hiatal hernia occurs when the stomach slides through a natural hole in the diaphragm, which can lead to acid reflux.