An estimate of how much a single food portion raises blood glucose, combining the glycaemic index (GI) with the amount of carbohydrate in that portion.
How GL differs from GI
The glycaemic index (GI) only rates how fast a type of carbohydrate raises blood glucose, without accounting for how much you eat. Glycaemic load (GL) combines GI with the actual portion size, so it gives a picture closer to what happens after a real meal. A food can have a high GI but a moderate GL if you eat only a small amount of it. That is why GL is often seen as more practical for planning everyday meals than GI on its own.
Why it matters for PCOS
Many women with PCOS have insulin resistance, meaning their cells respond less readily to insulin. When blood glucose spikes quickly, the body has to release more insulin to compensate. Lower-GL meals tend to produce a slower, smaller rise in blood glucose and insulin. For some people this can mean feeling fuller for longer and having steadier energy through the day. For more context, see insulin resistance and what is PCOS.
Using it in everyday eating
The basic idea is not to avoid all carbohydrates but to choose higher-fibre sources and pair them with protein and healthy fats. For example, brown rice with vegetables and fish usually has a gentler effect on blood glucose than a large portion of white rice with little else. This approach lines up with the principles discussed in the PCOS diet page, and it works best as a long-term habit rather than a strict, temporary restriction.
Limits and when to talk to someone
GL is a dietary guide, not a blood test or a treatment, and it does not diagnose PCOS. The GL of the same food also shifts with cooking method, ripeness, and what it is eaten with, so it is always an estimate and does not need to be calculated precisely for every meal. Its effect varies from person to person too, so it is most useful as a general guide rather than a strict rule. If you have diabetes, take blood-sugar medicine, or are pregnant, talk to a doctor or dietitian before making big changes to how you eat.
This glossary is education, not diagnosis. For your own situation, ask a doctor or pharmacist.