Glycemic Load Food Assessment
Score foods by blood-sugar impact per serving, not by label claims or guesswork
The Glycemic Load (GL) framework improves on the Glycemic Index (GI) by accounting for actual portion size when predicting blood sugar impact. GI ranks carbohydrates on a scale to 100 relative to pure glucose, but ignores how much of a food you actually eat. GL multiplies GI by the carbohydrate grams per serving, revealing the true blood-sugar hit per meal. A food like watermelon has a high GI but low GL because it is mostly water. Conversely, rice, breakfast cereals, and potatoes carry unexpectedly high GLs that their healthy reputations conceal. By selecting foods using GL rather than marketing claims or assumptions, people can dramatically reduce daily blood sugar load and prevent the insulin spikes that drive fat storage, fatty liver, and metabolic disease.
- Not all carbohydrates are equally harmful—sugar density per serving matters more than food category
- Glycemic Load = GI × carbohydrate grams per serving ÷ 100, giving a real-world blood sugar impact number
- Blood sugar spikes, not just total calories, are a primary driver of fat storage and metabolic disease
- Many foods marketed as healthy (cereals, brown rice, bananas) carry surprisingly high glycemic loads
- Understanding a food's actual blood glucose effect removes reliance on packaging claims and guesswork
- Learn the GI baselineUnderstand that pure glucose scores 100 on the GI scale and all other carbohydrates rank below it. Recognize that many foods assumed to be healthy—brown rice, bananas, breakfast cereals—have unexpectedly high GI values.Pro tipUse a visual anchor: a 150g serving of boiled rice equals approximately 10 teaspoons of sugar in blood glucose equivalent—more than a chocolate bar.WarningDon't stop at GI alone. It measures rate of glucose release but ignores how much of a food you actually eat in one sitting.
- Factor in portion size to calculate GLMultiply GI by the actual carbohydrate grams in your typical serving, then divide by 100. This single step converts an abstract ranking into a real-world blood sugar impact score for the portion you actually eat.Pro tipWatermelon has a high GI but low GL per serving because it is mostly water—you would need a very large portion to equal the impact of a dense carbohydrate like bread.
- Audit the GL of your regular mealsList the 5–10 foods you eat most frequently and look up or calculate their GL. You will almost certainly find surprising results from foods you considered staples or health foods.Pro tipA GL database or nutrition app speeds this significantly. Focus your audit on breakfast foods first—cereals and toast are often the highest daily GL contribution.WarningBe especially critical of foods labeled 'whole grain,' 'natural,' or 'low fat'—these marketing terms do not predict GL and can actively mislead.
- Replace your highest-GL staples one at a timeSelect the single highest-GL food you eat daily and replace it with a lower-GL alternative—for example, swap breakfast cereal for eggs, white rice for cauliflower rice, or bread for a leafy salad base. Sustain the swap for two to four weeks before adding the next change.Pro tipTargeting your top 2–3 high-GL foods can reduce your daily blood sugar load dramatically without requiring a complete dietary overhaul.
- Monitor hunger and energy as early feedback signalsTrack how hungry you feel between meals and your energy levels throughout the day. Reduced inter-meal hunger and stable energy without afternoon crashes are early, reliable indicators that blood sugar is stabilizing.Pro tipMany people on lower-GL diets report they no longer feel the need to eat breakfast—this reflects stable blood glucose rather than starvation.
Dr. Unwin placed common foods on a table and revealed their actual sugar equivalents in teaspoons of glucose: cornflakes contained 8 teaspoons, a chocolate bar 7.5, a banana 6, and 150g of boiled rice approximately 10. Most participants assumed rice and cereal were far healthier than a chocolate bar. The visual demonstration immediately reframed participants' understanding of healthy foods and made GL concrete rather than theoretical.
Using GL rather than GI, Dr. Unwin demonstrated that watermelon—despite a high GI—can be eaten in substantial quantities before matching the blood sugar impact of a chocolate bar, because it is mostly water. The GL calculation accounts for carbohydrate density per serving, making this comparison possible and removing unnecessary fear of certain fruits while highlighting the greater danger of dense carbohydrates.
Extracted from The Diary Of A CEO, featuring Dr. David Unwin, a UK GP who pioneered low-carbohydrate dietary intervention for metabolic disease. A patient challenged him in 2013, noting that the difference between GI and real-world blood sugar impact was school-level biology he should have taught her years earlier. Unwin has since used GL education as a core tool in reversing pre-diabetes and type 2 diabetes in hundreds of patients.