Medically reviewed by Qin Rao, MD
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- The gut microbiome plays a major role in overall health, including immunity, metabolism, and disease prevention.
- Daily habits like poor sleep, high sugar intake, stress, and alcohol use can disrupt gut balance.
- Healthy routines such as staying hydrated, eating fiber-rich foods, and maintaining regular meals support a healthier gut.
There’s evidence that links the gut microbiome—a community of over a trillion microorganisms living in the large intestine—to several important health benefits. These range from supporting immune, skin, brain, mood, and metabolic health to preventing chronic diseases. However, lifestyle choices can influence your gut microbiome and the digestive system as a whole. Here are nine daily habits that can secretly disrupt gut health.
1. Regularly Drinking Alcohol
Alcohol can cause intestinal inflammation and negatively affect gut microbial population and diversity. This is mainly observed in binge drinking, which is drinking more than four to five drinks in one sitting, or eight or more drinks per week for women and 15 or more drinks per week for men.
Moderate drinking (one drink or less per day for women and two or fewer for men) carries less risk. However, no amount of alcohol is entirely safe for overall health. For those prioritizing gut health, an even more conservative approach—such as one or two drinks per week—may be a better choice.
2. Not Sleeping Enough
Sleep is central to nearly every aspect of health, so t’s no surprise that it also plays a key role in maintaining a healthy gut.
A 2025 study found that people who regularly slept fewer than six hours per night were more likely to experience gut microbiota imbalance. To help prevent this, aim for at least seven to nine hours of sleep each night.
3. Eating Too Much Added Sugar
Added sugar is a major pro-inflammatory agent. In fact, a 2020 study found that high added sugar intake skewed gut microbes to have an increased pro-inflammatory effect.
Other research has shown that added sugar intake can generally negatively alter gut microbiota diversity and composition. Try to stick to the recommended added sugar intake of 25 to 36 grams per day.
4. Chronic Stress
Stress takes a toll on the gut in several ways: it affects gut microbiome composition and increases the risk of gastrointestinal disorders such as irritable bowel syndrome, abdominal pain, constipation, bloating, and diarrhea.
Stress-reduction practices like exercise, meditation, deep breathing, and journaling can help you mitigate this effect. In fact, being sedentary is associated with poorer gut microbiota health.
5. Not Drinking Enough Water
Proper hydration is key in a well-functioning digestive tract—and gut microbiome. It helps move food through the digestive tract more smoothly, supporting digestion and nutrient absorption.
Research has also linked proper hydration to improved diversity of the gut microbiota and overall gut homeostasis. Though hydration needs are highly individualized, aiming for at least 48 to 64 fluid ounces of water per day is a great place to start.
6. Not Chewing Enough
Not chewing your food thoroughly can make your gastrointestinal system work harder. When you don’t chew enough, you may swallow excess air, strain the digestive process, and disrupt hunger cues—many of which can contribute to gas or bloating. Evidence shows it can even result in dysbiosis in the gut microbiome.
Try adding a few more chews than you normally would at mealtimes and see how you feel.
7. Not Eating Enough Fiber or Variety
Eating the same thing everyday and/or not eating enough fiber can also secretly do your gut a major disservice. Fiber—particularly soluble fiber—serves as fuel for beneficial gut microbes, helping them flourish and, in turn, support overall health.
Aim for 25 to 35 grams of fiber per day for optimal gut health, and increase your intake gradually if you aren’t eating enough.
Additionally, embracing a variety of foods—especially polyphenol-rich options like fruits, vegetables, whole grains, nuts, seeds, and legumes—helps ensure your gut microbes receive a wide range of supportive nutrients.
8. Skipping Regular Meals
Regular meal times are also crucial in maintaining a happy gut. Standard meal and snack times promote consistent digestion, and research suggests that gut microbes follow their own circadian rhythm, so sticking to consistent eating windows and mealtimes can help support them.
9. Eating Too Many Ultra-Processed Foods
Eating too many ultra-processed foods—such as sweetened beverages, packaged snacks, processed meats, desserts, and certain ready-to-eat meals—strains several body systems, gut health included.
Research suggests these foods can compromise the gut barrier and reduce microbiota diversity, underscoring the importance of choosing more whole-food options and home-cooked meals whenever possible.
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