Coconut sugar is commonly marketed with a glycemic index around 35, placing it in the “low GI” category. That number has become one of the product’s main selling points, but the evidence behind it is surprisingly thin, and clinical studies have produced results that complicate the picture. Whether coconut sugar actually behaves like a low-GI sweetener in your body depends on factors most labels never mention.
Where the GI of 35 Comes From
The figure of 35 traces largely to a single study conducted by the Philippine Food and Nutrition Research Institute in 2003. The Philippines is one of the world’s largest coconut sugar producers, and the study tested a small number of participants to generate a GI value that has since been repeated across packaging, health blogs, and marketing materials worldwide. Several peer-reviewed papers reference this number, with one noting that coconut sugar “has low glycemic index (GI) of 35” compared to refined sugars at around 60 per serving, and attributing the lower value to a fiber called inulin that slows glucose absorption.1Journal of the Anatomical Society of India. Insulin Resistance through High-sugar Diets and its Effects on the Endometrium in Swiss Albino Mice: An Experimental Study to Elicit the Beneficial Effects of Coconut Sugar
The problem is that a single study with a small sample, conducted in one country using one batch of coconut sugar, is a fragile foundation for a universal health claim. Coconut sugar is not a standardized product the way refined white sugar is. Its composition varies with the coconut palm species, the region where it grows, the season of harvest, and how the sap is processed. A GI value from one sample does not necessarily apply to the jar you buy at the grocery store.
When Clinical Testing Tells a Different Story
A clinical study comparing coconut sugar (in the form of coconut jaggery) to cane sugar in 43 people with type 2 diabetes found no significant difference in blood glucose response between the two. Peak blood glucose concentrations and the total rise in blood sugar over time were statistically indistinguishable, leading the researchers to conclude that coconut jaggery “cannot be considered as a healthy substitute for cane sugar in type 2 diabetic patients.”2Journal of Future Foods. Comparison of blood glucose responses by cane sugar (Saccharum officinarum) versus coconut jaggery (Cocos nucifera) in type 2 diabetes patients The participants were overweight adults with an average age of about 48, and their fasting blood glucose levels were already elevated.
This result directly challenges the idea that coconut sugar is meaningfully gentler on blood sugar than regular sugar, at least for people who are already managing diabetes. It is worth noting that the study used coconut jaggery, a traditional processed form of coconut sugar, rather than the granulated coconut sugar commonly sold in Western markets. Processing differences could affect the result. But the study is one of the few that actually tested coconut sugar head-to-head against cane sugar in real people, rather than relying on a lab-derived GI value, and the outcome was not flattering for coconut sugar’s reputation.
Why the Numbers Can Vary So Much
Glycemic index is not a fixed property of a food in the way that, say, its weight or color is. GI depends on the specific carbohydrate profile of what you eat, and coconut sugar’s profile shifts depending on how it is made. Research on coconut sap processing found that the sap contains higher amounts of simple sugars like fructose and glucose, and lower amounts of sucrose, compared to what you might expect from the finished product.3PubMed. Processing of coconut sap into sugar syrup using rotary evaporation, microwave, and open-heat evaporation techniques The processing method, whether open-heat evaporation, microwave, or rotary evaporation, changes the final sugar ratios.
This matters because fructose and glucose behave differently in your body. Glucose hits the bloodstream quickly, while fructose is metabolized primarily by the liver and does not spike blood glucose in the same immediate way. A coconut sugar with more fructose relative to glucose would naturally test lower on the glycemic index, but that does not necessarily make it healthier overall. More on that below.
Production temperature, cooking duration, and even the age of the palm also play roles. Artisanal coconut sugar made in a village in Indonesia may have a very different carbohydrate fingerprint than a mass-produced version from a factory using different evaporation techniques. When someone cites a GI of 35 as though it is a universal fact, they are ignoring this variability entirely.
The Inulin Claim
One of the most frequently repeated explanations for coconut sugar’s low GI is its inulin content. Inulin is a type of soluble fiber that acts as a prebiotic, feeding beneficial gut bacteria, and it slows the absorption of glucose from the digestive tract. The logic goes: coconut sugar contains inulin, inulin slows glucose absorption, therefore coconut sugar raises blood sugar more slowly.1Journal of the Anatomical Society of India. Insulin Resistance through High-sugar Diets and its Effects on the Endometrium in Swiss Albino Mice: An Experimental Study to Elicit the Beneficial Effects of Coconut Sugar
The chain of logic is not wrong in principle, but the practical question is how much inulin actually ends up in the coconut sugar you use. Fresh coconut sap does contain inulin, but the amount surviving through the heating and evaporation process varies. Some analyses have found only trace amounts in the finished granulated product. If the inulin has largely been broken down during processing, it cannot do much to slow glucose absorption. The inulin story is plausible as a mechanism, but treating it as a guaranteed feature of every spoonful of coconut sugar is a stretch.
What Happens When You Use It in Real Food
GI values are typically measured in isolation, meaning a person eats a fixed amount of the food by itself, and their blood sugar response is tracked. But nobody eats coconut sugar on its own. You use it in baking, in coffee, in sauces, in granola bars. The other ingredients in a meal, especially fat, protein, and additional fiber, all influence how quickly glucose enters the bloodstream.
A study testing granola bars made with different sweeteners found that bars using coconut sugar had a GI of about 55, while bars made with regular sucrose came in at roughly 52.4International Journal of Food Science & Technology. Physical, sensory, in-vitro starch digestibility and glycaemic index of granola bars prepared using sucrose alternatives All the bars fell below the 55 threshold for “low GI” foods, but the coconut sugar version did not score lower than the regular sugar version. In fact, it scored slightly higher. The other ingredients in the bars, particularly the oats, nuts, and fats, dominated the glycemic response. The type of sugar used mattered far less than the overall composition of the food.
This is a useful reality check. If you are baking cookies or making a stir-fry sauce and you swap in coconut sugar for white sugar, the difference in blood glucose response is likely to be small or nonexistent, because the rest of the meal is doing most of the work. The GI advantage of coconut sugar, to whatever extent it exists when tested alone, gets diluted by everything else on the plate.
The Fructose Trade-Off
If some of coconut sugar’s lower GI comes from having a higher fructose-to-glucose ratio than white sugar, that introduces a separate concern. Fructose does not spike blood glucose the way glucose does, which makes fructose-heavy sweeteners look good on a GI test. But fructose is metabolized almost entirely by the liver, and research has linked excess fructose intake to fat accumulation in the liver. The metabolic pathway involves rapid energy consumption in liver cells, which triggers a cascade leading to uric acid production and fat storage.5PubMed Central. Fructose and sugar: A major mediator of non-alcoholic fatty liver disease
This does not mean coconut sugar is uniquely dangerous. Regular table sugar is roughly half fructose anyway, and fruits contain fructose alongside fiber and other nutrients. The point is that a lower glycemic index achieved through higher fructose is not the same thing as being “healthier.” A sweetener can be gentle on blood glucose in the short term while still contributing to metabolic problems over time if consumed in excess. The GI number alone does not capture this nuance, and marketing that leans on the GI of coconut sugar tends to ignore it entirely.
The Nutritional Extras
Beyond the GI question, coconut sugar does contain small amounts of minerals and antioxidants that refined white sugar lacks. Iron, zinc, potassium, and some polyphenols show up in analyses, and a review of coconut sugar’s nutritional profile described it as a “healthier, sweetener option than the majority of other sugars that are commercially available” on the basis of its nutritional value and low glycemic index.6PubMed Central. Coconut Sugar: Chemical Analysis and Nutritional Profile; Health Impacts; Safety and Quality Control; Food Industry Applications
The catch is quantity. You would need to eat a very large amount of coconut sugar to get meaningful amounts of any mineral, and at that point the sugar itself would be the bigger health concern. The trace minerals are a real difference from white sugar but not a practical reason to eat more coconut sugar. Think of it the way you might think about the iron in molasses: real, but not a reason to pour molasses on everything.
Adulteration and What You Actually Buy
Coconut sugar costs significantly more to produce than cane sugar. Coconut palms yield less sap per acre, the collection process is labor-intensive (often done by hand, climbing each tree twice a day), and the evaporation step is energy-intensive. This price gap creates an incentive for producers to cut coconut sugar with cheaper cane sugar. The adulteration problem is well-known within the industry, and some products marketed as pure coconut sugar contain a significant percentage of cane sugar.
If your coconut sugar has been mixed with cane sugar, any GI advantage shrinks further. Detection methods exist, including isotope ratio testing that can distinguish carbon sources from different types of plants, but these are lab techniques, not something a consumer can do at home. The practical takeaway is that buying from a reputable brand with third-party testing matters if you are paying a premium for coconut sugar specifically because of its glycemic properties. A blended product at a low price point is probably not delivering what the label implies.
How Coconut Sugar Stacks Up Against Other Sweeteners
Compared to refined white sugar, which has a GI in the mid-60s to 70, coconut sugar does appear to score lower in most testing, though the gap may be smaller than the widely cited 35-versus-65 comparison suggests. The Sri Lankan clinical data showing no meaningful difference in diabetic patients narrows the gap further for the population most interested in GI values.
Against other alternative sweeteners, coconut sugar sits in a middle zone. Honey varies widely by type but typically lands in the 45-to-65 range. Agave nectar scores lower on the GI scale (around 15 to 30 depending on fructose content), but that low score comes almost entirely from its very high fructose load, which brings its own metabolic concerns. Date sugar, made from ground dried dates, tends to have a moderate GI but comes with the fiber and minerals of the whole fruit. Among natural caloric sweeteners, none offer a dramatic metabolic advantage over the others in the amounts people typically use.
If you are choosing between sweeteners purely for blood sugar management, the more effective lever is usually how much you use, not which one you pick. Cutting a tablespoon from a recipe makes a bigger difference than switching from cane sugar to coconut sugar at the same quantity.
Who Should and Should Not Rely on the GI Claim
For someone without diabetes who enjoys the caramel-like flavor of coconut sugar in their baking and is fine with the higher price, there is nothing wrong with using it. It is a minimally processed sweetener with a more complex flavor profile than white sugar, and the small amounts of minerals it contains are a mild bonus. The GI claim is just not the reason to buy it.
For people with type 2 diabetes or insulin resistance who are actively managing their blood sugar, relying on coconut sugar as a “safe” sweetener based on a GI of 35 is risky. The clinical evidence available does not support the idea that it produces a meaningfully different glucose response from cane sugar in this population.2Journal of Future Foods. Comparison of blood glucose responses by cane sugar (Saccharum officinarum) versus coconut jaggery (Cocos nucifera) in type 2 diabetes patients If you are monitoring blood glucose with a meter or continuous glucose monitor, testing your own response to coconut sugar is far more informative than trusting a GI number from a decades-old study conducted on a different product in a different population.
For people following a low-GI diet for general wellness or weight management, coconut sugar is fine as part of a broader pattern, but the impact of any single sweetener swap on overall glycemic load is small. The foods surrounding the sugar, particularly fiber, protein, and fat, matter much more. Swapping coconut sugar into a recipe that is already built around whole grains, nuts, and healthy fats will not change the meal’s glycemic response in a way you would notice.
The Flavor Difference That Actually Matters
Where coconut sugar genuinely stands apart from white sugar is taste and culinary behavior. It has a deep, butterscotch-like flavor with mild caramel notes that can enhance baked goods, Southeast Asian sauces, and coffee in ways that white sugar cannot. It also retains some moisture, which slightly changes the texture of cookies and cakes. Many chefs and bakers use it specifically for these qualities rather than for any health claim.
Coconut sugar does not dissolve as readily as white sugar in cold liquids, which makes it a poor choice for things like iced tea or cold cocktails unless you make a simple syrup with it first. In baking, it can be substituted one-to-one for brown sugar in most recipes, though the result will be slightly drier and darker. Its flavor is stronger than white sugar’s, so it can overpower delicate recipes where sugar is meant to sweeten without adding much character. For bold-flavored dishes, that strength is a feature. For a vanilla sponge cake, it might be a liability.