Glycemic load vs glycemic index: which one matters

What the index measures

Glycemic index ranks a food by how fast its carbohydrate raises blood glucose, on a scale against pure glucose. High GI means a fast rise, low GI a slower one. So far so reasonable.

The problem is that GI is measured using a fixed fifty grams of carbohydrate, regardless of how much you would actually eat. Watermelon has a high GI, but a normal slice contains very little carbohydrate, so the fast rise barely registers in practice.

Why load is the better number

Glycemic load combines two things that matter: how fast the carbohydrate hits, and how much of it is in the portion you eat. It is the index scaled to a real serving, which is why it tracks your actual response far better.

A high GI food in a small amount can have a low load. A moderate GI food eaten in a large amount can have a high load. Load captures the meal as you eat it, which is the only version that affects you.

Using it without a spreadsheet

You do not need to memorise tables. The practical takeaways are simple: portion size matters as much as food choice, and pairing carbohydrate with protein, fat and fibre slows the whole rise.

Equil estimates the glycemic load of each meal from the photo, not just a generic GI label, so the spike risk it shows reflects the plate in front of you. That is the number that maps to how you will actually feel an hour later.