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What is Glycemic Index

What is Glycemic Index? A Plain-Language Guide for Indians

What is glycemic index? The Glycemic Index (GI) tells you how fast a food raises your blood sugar after you eat it — on a scale of 0 to 100. Understanding what is glycemic index is one of the most useful pieces of nutrition knowledge for Indians, given how high-GI our traditional staple foods tend to be.

What is Glycemic Index — The Simple Definition

The Glycemic Index measures the speed at which carbohydrates in a food are broken down into glucose and released into the bloodstream. A food with a high GI releases glucose rapidly — causing a sharp blood sugar spike. A food with a low GI releases glucose slowly — providing steady, sustained energy.

Pure glucose is used as the reference point with a GI of 100. All other foods are measured against this standard.

How Glycemic Index is Measured

GI is measured in clinical settings. Ten or more healthy volunteers eat a portion of the test food containing 50g of digestible carbohydrates. Their blood glucose is measured at intervals over two hours. The result is compared against pure glucose as the reference. The average across all subjects becomes the food’s GI value. This is why the glycemic index is reliable — it is not a calculation or an estimate. It is a measured, averaged human physiological response.

Low, Medium, and High Glycemic Index — What the Numbers Mean

  • Low Glycemic Index (0 to 55): Food digests slowly. Glucose enters the bloodstream gradually. Energy is sustained. Hunger stays away longer.
  • Medium Glycemic Index (56 to 69): Moderate digestion speed. A reasonable choice for most people.
  • High Glycemic Index (70 to 100): Food digests quickly. Glucose floods the bloodstream rapidly. Energy peaks and then drops. Hunger returns sooner.

Why the Glycemic Index Matters Specifically for Indians

The traditional Indian diet — while rich in vegetables, pulses, and spices — is heavily built around high glycemic index carbohydrates. White rice, maida, white bread, poha, and regular sugar form the backbone of most Indian meals. This means most Indians experience multiple blood sugar spikes every single day without realising it.

Switching to lower glycemic index alternatives does not require an overhaul of Indian cooking. In most cases, it requires substituting one or two ingredients — like the sweetener or the grain — while keeping everything else the same.

Glycemic Index vs Glycemic Load — What is the Difference?

The glycemic index measures how fast a food raises blood sugar. Glycemic Load accounts for how much of that food you actually eat. Watermelon has a high glycemic index of 72 — but a typical serving contains very little carbohydrate, so its glycemic load is actually low. Use the glycemic index to choose between foods. Use glycemic load to understand portion size impact.

Which Indian Foods Have the Lowest Glycemic Index?

Some of the lowest glycemic index foods commonly available in India include guava (GI 12), roasted chana (GI 28), moong dal (GI 38), parboiled rice (GI 38 to 45), rolled oats (GI 55), bajra roti (GI 54), and jowar roti (GI 53). Most vegetables and pulses are naturally low glycemic index — which means a traditional dal-sabzi meal is already a reasonably low GI combination.

Common Misconceptions About the Glycemic Index

Sugar-free means low glycemic index — No. Sugar-free products use artificial sweeteners that have no GI and no nutritional value. Low GI means real food that digests slowly.

All natural sweeteners are low glycemic index — No. Honey has a GI of 58 (medium). Regular jaggery has a GI of approximately 84 (high). Natural does not equal low GI.

Low glycemic index means no carbs — No. Low GI is not a low-carb diet. Lentils, oats, most vegetables, and many fruits are low GI and carbohydrate-containing foods.

Brown rice has a much lower glycemic index than white rice — Partially. Brown rice GI is approximately 55 vs white rice at 72. The difference is real but smaller than many assume. Parboiled rice at GI 38 to 45 is a much bigger improvement.

How to Start Eating Low Glycemic Index Foods

The simplest approach for Indians is three changes: switch your sweetener from regular sugar or jaggery to a verified low glycemic index alternative; switch your rice from regular white rice to parboiled or basmati; and pair every high GI food with a fibre or protein source. These three changes will significantly lower your daily glycemic load without any dramatic dietary overhaul.

Next: See the glycemic index of all Indian sweeteners — the jaggery truth may surprise you →