Most people pass gas about 10 times a day, and anything up to 20 times falls within the normal range. If you’re past that threshold, or the frequency just feels excessive, the good news is that most causes are straightforward and fixable. Gas comes from two sources: air you swallow and food that bacteria ferment in your large intestine. Reducing flatulence means targeting one or both of those sources.
Why You Have Gas in the First Place
Your colon is home to trillions of bacteria, and their primary job is breaking down food your small intestine couldn’t fully digest. Certain carbohydrates, especially fiber, resistant starches, and natural sugars in beans, vegetables, and grains, reach the colon mostly intact. Bacteria ferment them and produce hydrogen, methane, and carbon dioxide as byproducts. That’s the gas you feel.
The other source is swallowed air. Every time you eat, drink, or swallow saliva, a small amount of air goes down with it. Most of that comes back up as a burp, but whatever makes it past your stomach continues through your digestive tract and exits as flatulence. Certain habits dramatically increase how much air you swallow without you realizing it.
Cut Down on Swallowed Air
Swallowing excess air, sometimes called aerophagia, is one of the easiest causes to fix because it’s entirely behavioral. The Cleveland Clinic identifies several common habits that increase air intake:
- Eating too fast. Slowing down and chewing thoroughly gives you fewer large gulps of air with each bite.
- Talking while eating. Conversation during meals opens your airway more often, pulling in extra air.
- Chewing gum or sucking on hard candy. Both keep you swallowing repeatedly.
- Drinking through straws. The suction pulls air into your mouth along with the liquid.
- Carbonated drinks. The carbon dioxide in sparkling water, soda, and beer adds gas directly to your digestive system.
- Smoking. Each inhale brings air into the esophagus.
Stress and anxiety can also drive air swallowing. Some people develop a nervous gulping habit without noticing it. Loose-fitting dentures cause the same problem by triggering extra saliva production and more frequent swallowing. If you use a CPAP machine for sleep apnea, the pressurized air can also contribute to bloating and flatulence the next morning.
Identify Your Trigger Foods
Because bacterial fermentation is the main gas factory in your gut, the foods you eat have the biggest impact on how much gas you produce. The usual suspects are well known: beans, lentils, broccoli, cabbage, Brussels sprouts, onions, whole grains, and certain fruits like apples and pears. These foods are healthy, so the goal isn’t to eliminate them permanently. Instead, try reducing portion sizes or introducing them gradually so your gut bacteria can adjust.
Keeping a simple food diary for a week or two is the most reliable way to connect specific foods to your symptoms. Write down what you eat and when you notice increased gas. Patterns usually emerge quickly. Some people find that a single food, like garlic or wheat, is responsible for most of their discomfort.
The Low FODMAP Approach
If a food diary doesn’t pinpoint clear triggers, a more structured approach called the low FODMAP diet can help. FODMAPs are a group of short-chain carbohydrates that ferment rapidly in the colon. They include fructose (in some fruits and honey), lactose (in dairy), fructans (in wheat, garlic, and onions), galactans (in legumes), and sugar alcohols like sorbitol and mannitol (in some sugar-free products and stone fruits).
The diet works in three phases: you remove all high-FODMAP foods for two to six weeks, then reintroduce them one category at a time to identify which ones cause problems, then settle into a long-term diet that avoids only your personal triggers. Research from Johns Hopkins Medicine reports that this approach reduces symptoms, including gas and flatulence, in up to 86% of people. It’s worth working with a dietitian if you try this, because the elimination phase is restrictive and can be hard to follow correctly on your own.
Lactose and Dairy
Lactose intolerance is one of the most common and most overlooked causes of excess gas. If your body doesn’t produce enough of the enzyme that breaks down lactose, the sugar in milk and soft cheeses passes undigested into your colon, where bacteria ferment it aggressively. The result is bloating, cramping, and flatulence, often within a few hours of eating dairy.
You can test this yourself by cutting out all dairy for a week and seeing if your symptoms improve. If they do, you have two practical options: avoid or limit dairy, or take a lactase enzyme supplement before eating it. These supplements come in a range of strengths, from about 3,000 to 9,000 FCC units per dose. Higher-strength versions work better for larger servings of dairy. Hard cheeses and yogurt are naturally lower in lactose and may not cause problems even if milk does.
Over-the-Counter Supplements
Two products show up most often on pharmacy shelves for gas: simethicone and alpha-galactosidase (sold as Beano).
Simethicone works by breaking up gas bubbles in your stomach and intestines, making them easier to pass. It can help with the feeling of pressure and bloating, but clinical evidence for its effectiveness at actually reducing flatulence is weak. It’s safe and inexpensive, so it’s worth trying, but don’t expect dramatic results.
Beano takes a different approach. It contains an enzyme that breaks down the complex sugars in beans, vegetables, and grains before they reach your colon. By digesting these carbohydrates earlier in the process, there’s less fuel left for bacteria to ferment. A randomized, placebo-controlled trial found that it significantly reduced the proportion of patients experiencing flatulence and decreased the number of days with moderate to severe bloating. The key is timing: you need to take it with your first bite of the problem food, not after symptoms start.
What About Probiotics?
Probiotics are heavily marketed for digestive health, but the evidence for reducing gas specifically is disappointing. A large systematic review covering 22 studies and over 1,400 patients found that most probiotic strains tested did not significantly reduce flatulence. Out of 15 studies examining probiotics for gas in people with irritable bowel syndrome, all three that measured flatulence as their primary outcome showed no benefit over placebo.
A few individual studies reported modest improvements, but these were typically seen at only one dose level or appeared after treatment had already ended, making the results hard to interpret. Probiotics may help with other digestive symptoms like diarrhea or general discomfort, but if your main complaint is gas, they’re unlikely to be the solution. In fact, one study found that probiotics actually worsened bloating, flatulence, and brain fog in patients with bacterial overgrowth in the small intestine, and symptoms only improved after the probiotics were stopped.
When Gas Signals Something Deeper
For most people, excess gas is a nuisance, not a medical problem. But persistent, severe flatulence that doesn’t respond to dietary changes can sometimes point to an underlying condition. Small intestinal bacterial overgrowth, or SIBO, is one possibility. It occurs when bacteria that normally live in the colon migrate into the small intestine and begin fermenting food earlier than they should. Two-thirds of SIBO patients report excessive gas, bloating, and abdominal cramping as their primary symptoms. SIBO is diagnosed with a breath test and treated with a course of antibiotics.
Celiac disease, chronic pancreatitis, and other conditions that impair nutrient absorption can also cause excess gas, because more undigested food reaches the colon. If your gas is accompanied by unexplained weight loss, blood in your stool, persistent diarrhea or constipation, or significant abdominal pain, those are signs that something beyond diet is involved and worth investigating with a doctor.
A Practical Starting Point
If you’re looking for the simplest path forward, start with the behavioral fixes: eat more slowly, skip the gum, drop the carbonated drinks for a week, and see what changes. Then look at your diet. Cut back on the most common gas-producing foods, especially beans, cruciferous vegetables, and dairy, one category at a time so you can tell what’s actually making a difference. If those steps don’t get you where you want to be, try Beano with meals that involve legumes or vegetables, or a lactase supplement before dairy. Save the low FODMAP diet for situations where simpler changes haven’t worked, since it requires more effort but has a high success rate when followed properly.