Potatoes cause gas because some of their starch resists digestion in the small intestine and travels to the large intestine, where gut bacteria ferment it and produce gas. The good news: how you prepare and eat potatoes makes a significant difference in how much of that starch reaches your colon. A few simple changes to cooking method, seasoning, and serving can dramatically cut down on bloating and discomfort.
Why Potatoes Cause Gas
Your body breaks down most potato starch using enzymes in your mouth and small intestine. These enzymes split starch into simple sugars that get absorbed into your bloodstream. But a portion of potato starch, called resistant starch, passes through the small intestine intact. Once it reaches the cecum and proximal colon, bacteria ferment it rapidly, producing hydrogen, carbon dioxide, and methane. That fermentation is what creates the bloating, pressure, and flatulence you feel hours after eating potatoes.
The amount of resistant starch in a potato changes dramatically based on how it’s cooked and whether it’s been cooled. A freshly cooked, hot potato has less resistant starch than one that’s been refrigerated. When cooked starch cools, its molecules reorganize into tighter structures that your digestive enzymes struggle to break apart. This is why cold potato salad or reheated leftover potatoes can be gassier than a potato eaten straight from the oven.
Cook Them Right
Thorough cooking is your first defense. Boiling, baking, or steaming potatoes until they’re completely soft breaks down much of their raw starch into forms your small intestine can handle. Undercooked or al dente potatoes retain more resistant starch. If you’re boiling potatoes, cook them until a fork slides through with zero resistance.
If you’re making potato salad, mashed potatoes from leftovers, or any dish that involves cooling and reheating, eat it warm rather than cold. Reheating does restore some digestibility, though not as much as eating potatoes fresh. The worst-case scenario for gas is eating cold, day-old potatoes straight from the fridge.
Peel Before Cooking
Potato skin is where most of the fiber lives. Dried potato skins are roughly 52% fiber, and the types found there (pectin, cellulose, and hemicellulose) are predominantly insoluble. Insoluble fiber passes through your digestive system intact and adds bulk that bacteria can ferment. Peeling your potatoes before cooking removes a significant source of gas-producing material.
This doesn’t mean potato skins are unhealthy. They’re a good source of nutrients. But if gas is your main concern, peeling is one of the simplest and most effective things you can do.
Choose Lower-Starch Varieties
Not all potatoes are created equal when it comes to starch composition. Potato starch contains two components: amylose and amylopectin. Amylose is the one that tends to form resistant starch when cooled, because its straight-chain structure lets molecules pack together tightly. Standard potatoes contain about 18% amylose. Waxy varieties (like red potatoes, fingerlings, and some yellow-skinned types) contain significantly less amylose and more amylopectin, which means less resistant starch formation overall.
If you find that Russet potatoes (a high-starch, high-amylose variety) consistently bother you, try switching to a waxy red or Yukon Gold potato. You may notice a real difference. Sweet potatoes have a slightly higher amylose content than regular potatoes (about 23%), so they’re not necessarily a better choice for this particular problem.
Season With Carminative Herbs and Spices
Certain herbs and spices have a long history of easing gas from starchy foods. These are called carminatives, and they work by relaxing the smooth muscle of your digestive tract, helping you pass gas more easily. Most herbs in the mint and carrot families qualify, including ginger, cumin, fennel, anise, cinnamon, basil, peppermint, cloves, sage, and thyme.
Adding these to potato dishes isn’t just flavor advice. Cooking starchy foods with carminative herbs is a traditional practice across many cuisines precisely because it helps with digestion. Roasted potatoes with rosemary and thyme, mashed potatoes with a pinch of nutmeg, or a potato soup with cumin and ginger are all doing double duty. A cup of peppermint or ginger tea after a starchy meal can also help.
Watch Your Portions and Pairings
The more starch you eat in one sitting, the more likely some of it will escape digestion and end up fermenting in your colon. Keeping potato portions moderate, roughly the size of your fist, gives your digestive enzymes a better chance of breaking everything down before it moves past the small intestine.
Eating potatoes alongside protein and fat also slows gastric emptying, which means starch spends more time in contact with your digestive enzymes. A potato eaten with butter and chicken will generally cause less gas than a large plate of plain boiled potatoes eaten on its own. Chewing thoroughly also matters. Starch digestion begins in your mouth with salivary amylase, so the more you chew, the more breakdown happens before food even reaches your stomach.
Check for Green Spots and Sprouts
If your digestive problems go beyond gas into stomach pain, nausea, or diarrhea that shows up 8 to 10 hours after eating, the issue might not be starch at all. Green-tinged potatoes and sprouted potatoes contain elevated levels of solanine, a naturally occurring compound that’s toxic even in small amounts. The gastrointestinal symptoms it causes are often delayed, which makes it easy to miss the connection.
Never eat potatoes that are green below the skin, have visible sprouts, or smell off. Cutting away a small green spot is generally fine, but if the green extends deep into the flesh, discard the potato entirely. Store potatoes in a cool, dark place to prevent greening.
Consider a Digestive Enzyme Supplement
If cooking adjustments and portion control aren’t enough, a digestive enzyme supplement containing amylase or glucoamylase may help. These are the same types of enzymes your body naturally produces to break down starch. Taking them with a meal gives your system extra capacity to process potato starch in the small intestine before it reaches the colon. Look for a broad-spectrum digestive enzyme blend that lists amylase on the label, and take it at the start of your meal for best results.
Worth noting: white potatoes are rated low-FODMAP by Monash University, meaning they don’t contain the specific fermentable sugars that trigger symptoms in most people with irritable bowel syndrome. If potatoes are your only problem food, the issue is almost certainly the resistant starch or fiber rather than a FODMAP sensitivity.