Coconut sugar is often marketed as a low-glycemic sweetener, but the evidence behind that claim is thin. The single study most frequently cited to support a low glycemic index (GI) of 35 was small and conducted by a Philippine government agency with an interest in coconut exports. More rigorous research paints a different picture: coconut sugar is about 70% sucrose, chemically identical to table sugar, and clinical trials in diabetic patients show no significant difference in blood sugar response between coconut sugar and cane sugar.
What’s Actually in Coconut Sugar
Coconut sugar is made by evaporating the sap of coconut palm flower buds. The end product looks and tastes like brown sugar with a slight caramel note. Chemically, roughly 70% of it is sucrose, the same molecule that makes up white table sugar. The remaining 30% is a mix of individual glucose and fructose molecules plus trace minerals.
That composition matters because sucrose breaks down into glucose and fructose during digestion, just as table sugar does. Your body processes both sweeteners through the same pathways. One teaspoon of coconut sugar contains about 18 calories compared to 16 in a teaspoon of cane sugar, so it’s slightly more calorie-dense per serving.
The GI Claim and Where It Comes From
The widely repeated GI value of 35 for coconut sugar traces back to a single analysis by the Philippine Food and Nutrition Research Institute. That number has been picked up by countless health blogs and product labels, but it has not been replicated in independent, peer-reviewed research. For context, pure glucose has a GI of 100 and white table sugar sits around 65.
A more controlled study published through ScienceDirect tested blood sugar responses in 43 adults with type 2 diabetes after consuming either coconut sugar (in the form of coconut jaggery) or cane sugar. The results were clear: there was no significant difference in peak blood glucose concentrations or in the total blood sugar response over time between the two sweeteners. The researchers concluded that coconut sugar “cannot be considered as a healthy substitute for cane sugar in type 2 diabetic patients.”
The Inulin Factor
One thing coconut sugar does contain that table sugar doesn’t is inulin, a type of soluble fiber. Lab analysis has found about 4.7 grams of inulin per 100 grams of coconut sugar. Inulin can slow glucose absorption in the gut and acts as a prebiotic, feeding beneficial bacteria. This is likely why some samples of coconut sugar test with a modestly lower glycemic response than pure sucrose.
The practical problem is scale. A teaspoon of coconut sugar weighs about 4 grams, which would deliver roughly 0.2 grams of inulin. You’d need to eat a very large amount of sugar to get a meaningful dose of inulin, and the metabolic cost of all that sugar would far outweigh any fiber benefit. You can get the same prebiotic effect from a small serving of garlic, onion, or chicory root without the sugar load.
Mineral Content in Perspective
Coconut sugar does contain more minerals than white sugar, including small amounts of potassium, zinc, and iron. But “more” is relative. As Tufts University’s nutrition researchers pointed out, a teaspoon of coconut sugar provides 0.083 milligrams of zinc compared to 0.001 milligrams in regular sugar. That’s technically 83 times more, but it’s still a nutritionally irrelevant amount. You would need to consume cups of coconut sugar to approach the zinc you’d get from a single handful of nuts.
How It Compares to Other Sweeteners
- White sugar: GI around 65. Coconut sugar’s real-world blood sugar impact appears very similar despite marketing claims.
- Honey: GI varies between 45 and 64 depending on the floral source. Contains trace enzymes and antioxidants but is still primarily sugar.
- Maple syrup: GI around 54. Offers some manganese and riboflavin, but again in small amounts.
- Agave nectar: GI around 15 to 30, but this is because it’s extremely high in fructose (up to 90%), which is processed by the liver rather than spiking blood glucose directly. High fructose intake carries its own metabolic risks.
None of these sweeteners are meaningfully “healthy.” The differences in GI between them are small enough that they don’t change the core dietary math: all added sugars contribute calories without significant nutrition, and reducing total intake matters far more than choosing one type over another.
What This Means if You’re Managing Blood Sugar
If you’re choosing coconut sugar because you believe it won’t raise your blood sugar, the clinical evidence doesn’t support that expectation. A swap from white sugar to coconut sugar at the same quantity will produce a very similar glucose response. For people with type 2 diabetes or insulin resistance, coconut sugar should be counted and limited the same way any other sugar would be.
Where coconut sugar does differ from table sugar is in flavor and texture. It has a richer, more complex taste that some people prefer in baking or coffee. If you enjoy it for that reason and use it in the same small quantities you’d use any sweetener, there’s nothing wrong with it. Just don’t pay a premium expecting a metabolic advantage that the science doesn’t back up.