Yes, baking powder is low FODMAP and safe to use during all phases of a low FODMAP diet. It contains no fermentable carbohydrates, so it won’t trigger symptoms even in people with significant IBS sensitivity. You can use it in your baking without worrying about portion limits.
What’s Actually in Baking Powder
Baking powder is a combination of three things: a base (almost always sodium bicarbonate), an acid (such as cream of tartar or monocalcium phosphate), and a filler to keep it shelf-stable. That filler is usually cornstarch. None of these components contain the types of sugars or sugar alcohols that qualify as FODMAPs.
The NHS lists baking powder, bicarbonate of soda, and cream of tartar all as suitable for a low FODMAP diet under the “flour and raising agents” category. This makes sense when you look at the chemistry: these are mineral salts and starches, not the short-chain carbohydrates (like lactose, fructose, or polyols) that ferment in the gut and cause bloating or pain.
The Cornstarch Question
Some people on a low FODMAP diet see “cornstarch” on the baking powder label and pause. Corn-based starches are low FODMAP. Cornstarch is a refined starch, not a source of fructans or GOS, so it doesn’t pose a problem. The amount in a teaspoon of baking powder is also tiny, usually just enough to prevent the acid and base from reacting prematurely in the container.
Some baking powders use calcium-based fillers like calcium carbonate or calcium sulfate alongside or instead of cornstarch. These are also FODMAP-free mineral compounds.
Wheat Starch in Some Brands
Here’s the one thing to check: a small number of baking powder brands, particularly in the UK and Australia, use wheat starch instead of cornstarch as their filler. Wheat starch in small amounts is generally considered low FODMAP because the fructans are mostly removed during starch processing, but if you’re in the elimination phase and want to be cautious, look for a brand that lists cornstarch (or “corn starch”) on the ingredients. Most North American brands, including the widely available ones, use cornstarch.
Baking Powder vs. Baking Soda
Baking soda (pure sodium bicarbonate) is also low FODMAP. The difference between the two is functional, not FODMAP-related. Baking soda needs an acidic ingredient in your recipe to activate, while baking powder contains its own acid and works on its own. Both are fine to use freely.
One thing worth knowing: sodium bicarbonate reacts with stomach acid to produce carbon dioxide gas. This is why some people feel bloated after taking baking soda as an antacid. That bloating is a gas pressure issue, not a FODMAP reaction. In normal baking amounts, most of the carbon dioxide is released during cooking, so it’s not a concern in finished baked goods.
Tips for Low FODMAP Baking
While baking powder itself is safe, the rest of your recipe matters more. Wheat flour is low FODMAP only up to about half a cup per sitting, so many people on the diet substitute with rice flour, oat flour, or certified gluten-free blends. When you swap flours, you may need to adjust your baking powder amount slightly since different flours absorb liquid differently and rise at different rates.
Other common baking ingredients to watch include honey (high in excess fructose), milk (contains lactose unless you use a lactose-free version), and apple or pear in fruit-based recipes. Baking powder won’t be the ingredient that trips you up. Focus your label-reading energy on sweeteners, dairy, and any dried fruit or fruit purees in the recipe instead.
Certified Low FODMAP Products
Two major certification programs, FODMAP Friendly and Monash University, test and label products as low FODMAP. You’re unlikely to find certified baking powder specifically because certification is optional and manufacturers of simple pantry staples rarely pursue it. The absence of a certification logo on your baking powder doesn’t mean it’s unsafe. It just means the company didn’t go through the testing process for a product that’s already clearly FODMAP-free based on its ingredients.