More than 50% of Americans reported changing their habits to support gut health in a 2024 International Microbiota Observatory survey, reflecting a broad shift in health priorities. Research estimates that two-thirds of Americans deal with GI symptoms like bloating, heartburn, diarrhea, and constipation. According to board-certified gastroenterologist Priya Simoes at Mount Sinai in New York City, “good” digestive health means not being plagued by gut-related symptoms and, more scientifically, having a diverse gut microbiome. However, there is no single gold-standard set of bacteria that everyone should have, as the healthy mix varies significantly from person to person.
Fiber and Dietary Diversity
All five gastroenterologists surveyed recommend increasing fiber intake through fruits, vegetables, whole grains, nuts, and legumes. Most Americans fall short of the USDA benchmark of roughly 28 grams of fiber a day. Insoluble fiber adds bulk to stool to prevent constipation, while soluble fiber acts as fuel for probiotics in the colon, allowing beneficial bacterial strains like Bifidobacteria and Lactobacilli to proliferate. As good bacteria process fiber, they produce short-chain fatty acids that nourish colon cells. However, introducing fiber gradually—starting with five grams and increasing in five-gram increments daily—helps avoid bloating.
Eating more than 30 types of plants per week creates greater gut microbiome diversity than eating fewer than 10 types, even with similar volumes. Different plant varieties feed different bacterial strains, and various phytochemicals like polyphenols, fermented by friendly gut bacteria, support a healthy microbiome.
Exercise, Hydration, and Sleep
Physical activity triggers muscles in the digestive tract wall to contract, promoting regular bowel movements. A 2023 analysis found that aerobic training in 30- to 90-minute sessions three to five times weekly sparked the greatest increase in bacterial diversity. Even 15 minutes of heart-rate-raising activity a couple times weekly makes a difference. Staying hydrated lubricates the GI tract and prevents constipation, particularly important when consuming fiber. Dehydration can also reduce saliva production, impairing the ability to clear acid from the throat and worsening reflux.
As little as two nights of disturbed sleep can change the gut microbiome profile negatively, according to a 2023 analysis. Poor sleep reduces beneficial Bacteroidetes bacteria while increasing less-friendly Firmicutes. Seven to nine hours of sleep supports gut health, while people with conditions like IBS or inflammatory bowel disease tend to experience more severe symptoms after poor sleep.
Stress Management and Antibiotic Use
The gut-brain axis creates constant feedback between the GI tract and brain, making stress management crucial. Under stress, nerves innervating the gut become “live wires,” causing normal intestinal movements to translate as abdominal pain or stomach upset. Chronic stress can alter the microbiome, increase bad-to-good bacteria ratios, and weaken the gut lining. Meditation, deep breathing, grounding techniques, and yoga can help reduce stress. Taking antibiotics only when prescribed by a health professional is important, as broad-spectrum antibiotics kill good gut bacteria alongside bad bacteria, potentially allowing harmful bacteria like C. difficile to multiply, causing severe diarrhea and small intestinal bacterial overgrowth.
This article is an AI-assisted summary. All facts and figures are drawn from the original report: https://www.self.com/story/how-to-improve-gut-health