Glycemic Load Explained

What glycemic load actually measures

Glycemic Index tells you how fast the carbohydrate in a food raises blood glucose, on a scale where pure glucose is 100. What it does not tell you is how much carbohydrate you are about to eat. That is the gap glycemic load closes.

Watermelon is the classic example. Its glycemic index is around 72, which sounds alarming. But a standard slice holds so little carbohydrate that its glycemic load lands near 4. The index is high; the actual effect on your blood sugar is small.

Available carbohydrate means total carbohydrate minus fibre, since fibre is not absorbed. The result is a single number describing the real glucose impact of the portion in front of you.

How to read the number

Across a whole day, a total glycemic load under roughly 100 is generally considered low and over 120 high, though the right target depends on your goals, your activity and any condition you are managing.

Why load beats index in practice

Glycemic index is a property of a food measured in a laboratory, using a fixed 50 gram carbohydrate portion that rarely matches how anyone eats. Glycemic load is a property of your meal. It moves when your portion moves, which is what makes it actionable.

• It scales with the plate. Doubling the rice doubles the load. The index does not move at all.
• It compares unlike foods fairly. A high-GI food eaten in a small quantity can matter less than a moderate-GI food eaten in bulk.
• It adds up. Loads across a meal or a day can be summed, which indexes cannot.

What changes a food's glycemic load

• Portion size. The single biggest lever, and the one most within your control.
• Fibre. Intact fibre slows absorption and lowers available carbohydrate.
• Fat and protein. Eaten alongside carbohydrate, both slow gastric emptying and blunt the peak.
• Processing. Milling, puffing and pureeing all raise the index of the same underlying grain or fruit.
• Ripeness and cooking. A riper banana and longer-cooked pasta both read higher than their firmer versions.
• Cooling. Cooked and cooled potato, rice and pasta form resistant starch, which lowers the load compared with the same food eaten hot.

How NutriOptio calculates it

NutriOptio computes glycemic load in code, from the glycemic index and the carbohydrate in the portion you actually logged, rather than asking a model to guess a number. Change the quantity and the load changes with it.

The glycemic index behind that calculation is an estimate informed by published research, shown as a band rather than false precision. Where a barcode resolves to a verified database entry, the carbohydrate figure is a real recorded value. We are explicit about which half is measured and which is estimated.