Low GI is one of the most frequently recommended dietary strategies for Type 2 diabetes — and one of the most frequently misunderstood. Let me break it down in plain language.
What does GI actually mean?
Glycaemic index (GI) is a ranking of carbohydrate-containing foods based on how quickly they raise blood glucose levels after eating. Foods are scored on a scale of 0-100 relative to pure glucose. Low GI foods (55 or below) are digested more slowly, causing a gentler, more gradual rise in blood glucose. High GI foods (70 or above) are digested quickly and cause a rapid spike.
Why does this matter for Type 2 diabetes?
In Type 2 diabetes, the body's ability to manage blood glucose is impaired. Repeated sharp spikes in blood glucose put extra demand on the pancreas and contribute to long-term complications. Choosing lower GI foods helps create a more stable blood glucose pattern — which is better for both day-to-day energy and long-term health outcomes.
Low GI in practice — swaps that make a difference
- Bread: white bread (high GI) → sourdough, dense wholegrain or rye bread (low-medium GI)
- Rice: jasmine rice (high GI) → basmati, Doongara or brown rice (low-medium GI)
- Breakfast cereal: cornflakes, rice bubbles (high GI) → oats, muesli, bran-based cereals (low GI)
- Potato: mashed or baked potato (high GI) → boiled waxy potatoes (cooled), sweet potato (lower GI)
- Snacks: crackers, rice cakes (high GI) → legume-based dips with veggie sticks, cheese and wholegrain crackers
GI isn't the whole story
There are a few important caveats I always share with clients. First, GI is measured for foods eaten in isolation — in a real meal, protein, fat and fibre all slow digestion and lower the overall glycaemic response. Second, portion size matters enormously. A large serve of a low GI food can still raise blood glucose significantly. Third, some high GI foods (like watermelon) are perfectly fine in normal portions. The overall dietary pattern matters more than obsessing over individual foods.
What about carb counting?
For people on insulin, carbohydrate counting is an important skill alongside GI awareness. If you're on insulin therapy, working with a dietitian who can teach you to match insulin doses to carbohydrate intake is highly worthwhile. The two approaches complement each other well.
The bottom line
Low GI eating is a practical, evidence-based tool for managing blood glucose — but it works best as part of a broader approach that includes balanced meals, regular eating, adequate protein, healthy fats and physical activity. If you'd like personalised guidance, I'd love to help you build a plan that fits your life.