The main drivers of gut health change are shifts in stomach acid, gut immunity and gastrointestinal flora—the complex ecosystem of bacteria in your digestive system.

When gut health is good, he says, you’re less likely to experience damaging inflammation and lapses in immunity.

The following ways to protect your digestive system may sound surprising because they’re not just about diet. “Everything ties together,” Mullin says.

Eat the right foods.

“Americans’ fiber intake is 40 to 50 percent of what it should be,” Mullin says. A balanced diet rich in fruits and vegetables provides the fiber that builds good bacteria and gut health.

Other foods that build a healthy digestive system include kefir (a fermented milk drink that’s similar to yogurt and is rich in probiotics) and other fermented or pickled foods (such as kimchi, sauerkraut and pickled ginger).

Ask your health care provider about foods for specific problems such as constipation or bloating.

Get more sleep.

Not getting enough sleep is linked to a higher prevalence of obesity, which sets you up for digestive system disorders.

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