Brown rice syrup is a liquid sweetener made by breaking down the starches in cooked brown rice into simpler sugars. It has a mild, butterscotch-like flavor and a thick, honey-like consistency. Often marketed as a natural alternative to refined sugar or corn syrup, it appears in granola bars, cereals, snack foods, and baked goods. But its nutritional profile tells a more complicated story than its “natural” label suggests.
How Brown Rice Syrup Is Made
The production process starts with cooked brown rice. Enzymes, typically alpha-amylase, are added to the rice to cut apart the long starch chains into shorter sugar molecules. Alpha-amylase works by snipping the chemical bonds inside starch molecules, rapidly breaking them down into smaller pieces: primarily glucose, maltose (two glucose molecules linked together), and maltotriose (three glucose molecules). The degree of breakdown is measured by something called the DE value, which indicates how far the starch has been converted into sugar.
Once the enzymatic process is complete, the liquid is strained to remove the rice solids, then cooked down into a thick, amber-colored syrup. Some manufacturers produce a “clarified” version that goes through an extra filtration step to strip out proteins, fats, and color pigments. Clarified brown rice syrup is lighter, more neutral in taste, and higher in purity, while the standard version keeps its natural amber color and subtle earthy flavor.
Nutritional Profile
Brown rice syrup is essentially concentrated sugar with very little else. A tablespoon contains roughly 55 to 75 calories, almost entirely from carbohydrates. Despite being derived from brown rice, which does contain minerals like magnesium, zinc, and manganese, the syrup itself retains negligible amounts of these nutrients. The processing strips away virtually all the fiber, protein, and micronutrients that make whole brown rice nutritious.
What remains is a mix of glucose and short-chain glucose molecules. Unlike table sugar or high-fructose corn syrup, brown rice syrup contains little to no fructose. This is sometimes framed as a health advantage, since excess fructose has been linked to fatty liver and metabolic problems. But the absence of fructose doesn’t make brown rice syrup a healthy sweetener, because the sugars it does contain come with their own drawbacks.
Glycemic Index: Higher Than Table Sugar
Brown rice syrup has a glycemic index of 98, according to the Sydney University GI database. That’s extremely high. For comparison, table sugar has a GI of 60 to 70, and pure glucose (the reference point for the scale) sits at 100. This means brown rice syrup spikes blood sugar almost as fast as pure glucose.
The reason is straightforward: the syrup is made almost entirely of glucose and glucose chains. Your body breaks those chains down quickly, flooding your bloodstream with sugar. For anyone managing blood sugar levels, whether due to diabetes, prediabetes, or insulin resistance, brown rice syrup is one of the worst sweetener choices available. Its “natural” origin doesn’t slow down the metabolic impact.
Interestingly, a rat study published in the journal Nutrients found that animals given brown rice syrup over eight weeks showed improved fasting blood sugar and better insulin sensitivity compared to those given table sugar. But this was in the context of long-term, controlled feeding in lab animals, not a green light for human consumption. The GI data remains the most relevant number for everyday decisions.
The Arsenic Concern
Rice absorbs arsenic from soil and water more readily than most grains, and brown rice contains more arsenic than white rice because the outer bran layer, where arsenic concentrates, is left intact. Brown rice syrup, as a concentrated rice product, carries this same risk.
This isn’t a theoretical worry. A 2012 study from Dartmouth College found significant levels of arsenic in foods sweetened with organic brown rice syrup, including baby formula, cereal bars, and energy drinks. The concern is specifically about inorganic arsenic, the more toxic form, which is a known carcinogen with long-term exposure.
Regulatory limits exist for some rice products. The FDA has set an action level of 100 parts per billion for inorganic arsenic in infant rice cereal, and international standards cap inorganic arsenic at 200 ppb for polished rice and 350 ppb for husked rice. However, no specific regulatory limit currently exists for brown rice syrup itself. The FDA’s Closer to Zero Action Plan aims to set additional action levels for arsenic in food products, but these are still in development. For parents in particular, this gap in regulation is worth noting: products sweetened with brown rice syrup, especially those marketed for children, may carry a meaningful arsenic exposure.
Low FODMAP but Not Low Sugar
One genuinely useful property of brown rice syrup is its FODMAP status. It is classified as low FODMAP, meaning it’s unlikely to trigger digestive symptoms in people with irritable bowel syndrome or similar gut sensitivities. This is because it contains glucose-based sugars rather than fructose, lactose, or sugar alcohols, which are the types of carbohydrates that tend to cause bloating, gas, and cramping in sensitive individuals.
For people following a low-FODMAP diet who still want a liquid sweetener, brown rice syrup is one of the better-tolerated options. Just keep in mind that “gut-friendly” and “healthy” are not the same thing. The blood sugar impact remains significant regardless of how well your digestive system handles it. One additional note: some brown rice syrups are made using barley enzymes rather than fungal enzymes, and those versions are not gluten free.
Using It in Cooking and Baking
Brown rice syrup works well as a binding agent in recipes like granola bars, rice crispy treats, and energy balls, where its sticky, viscous texture is an asset. It’s less sweet than sugar or honey, with a mild caramel or butterscotch flavor that pairs well with nuts, oats, and chocolate.
If you’re substituting it for granulated sugar in baking, use about 1ΒΌ cups of brown rice syrup for every cup of sugar and reduce the other liquids in the recipe slightly to compensate for the added moisture. Because it’s less sweet than sugar, you may want to taste and adjust. It dissolves well in warm liquids, making it a reasonable option for sauces, dressings, and glazes.
Its thick consistency can make it tricky to measure. Lightly oiling your measuring cup or spoon beforehand helps the syrup slide out cleanly.
How It Compares to Other Sweeteners
The main selling point of brown rice syrup is what it doesn’t contain: no fructose, no high-fructose corn syrup, no refined cane sugar. For people specifically trying to avoid fructose, that matters. But in nearly every other nutritional dimension, it performs poorly compared to alternatives.
- Versus honey: Honey has a lower glycemic index (around 58), contains small amounts of antioxidants and antimicrobial compounds, and is sweeter per teaspoon, so you use less.
- Versus maple syrup: Maple syrup provides manganese and riboflavin, has a lower GI (around 54), and offers more complex flavor.
- Versus table sugar: Even plain sugar has a significantly lower glycemic index (60 to 70) than brown rice syrup’s 98.
- Versus high-fructose corn syrup: Brown rice syrup avoids the fructose load, but its glucose spike is comparably sharp.
Brown rice syrup occupies an odd position: it’s marketed as a healthier alternative, but it raises blood sugar faster than the sweeteners it’s meant to replace. Its real advantages are narrow. It’s fructose-free, low FODMAP, and available in organic versions. For most people, those benefits don’t outweigh the extremely high glycemic impact and the arsenic concern. If you enjoy it for its flavor or texture in specific recipes, that’s a reasonable use, but treating it as a health food overstates the case considerably.