Glycemic Load Food Selection Framework
Replace GI guesswork with glycemic load precision to control blood sugar by portion size.
Glycemic index (GI) measures how fast a carbohydrate raises blood glucose relative to pure glucose, but it ignores portion size. Glycemic load (GL) corrects this by multiplying GI by the actual grams of carbohydrate consumed per serving. A high-GI food in a tiny portion can have a lower GL than a moderate-GI food eaten in bulk. This framework teaches users to evaluate foods by their real-world blood-sugar impact rather than perceived healthiness. Staples marketed as nutritious—corn flakes, white rice, potatoes—can carry GL values that rival or exceed chocolate. By auditing and swapping the two or three highest-GL items in your daily diet, you systematically reduce the insulin demand that drives visceral fat, fatty liver, and metabolic disease.
- Portion size determines real blood-sugar impact as much as carbohydrate type
- Water content in food dilutes effective sugar density per gram
- Food marketing actively obscures glycemic reality
- Controlling insulin demand is the master lever for metabolic and weight management
- Small targeted substitutions outperform broad dietary restriction for long-term adherence
- Learn the mechanical difference between GI and GLGlycemic index scores how fast a carb raises blood sugar relative to pure glucose (score: 100). Glycemic load equals (GI × grams of carbohydrate per serving) ÷ 100, giving the real-world blood sugar impact of an actual portion rather than an arbitrary quantity.Pro tipA GL of 10 or below per food item per meal is generally considered low; 20 or above is high. Use this rough scale to categorize foods at a glance before consulting full tables.
- List your five most frequently eaten carbohydrate foodsWrite down the five carb-containing foods you eat most often across the week—breakfast items, bread, pasta, rice, cereals, fruit, sugary drinks. Frequency matters more than quantity for this initial audit.WarningDo not rely on memory alone. Track your actual eating for 48 hours before making this list or you will systematically under-report everyday staples like toast and cereal.
- Look up the GL for your actual portion size of each foodUse a published GL table or nutrition database to find the GL for the portion you actually consume—not a notional 50g serving. A 150g portion of boiled white rice, for example, carries a sugar-equivalent load that surprises most people.Pro tipDr. Unwin converts GL into teaspoons-of-sugar equivalents as a visual aid: corn flakes ≈ 8 teaspoons, a chocolate bar ≈ 7.5, a boiled potato similar. Finding the sugar-equivalent figure makes GL intuitively real.WarningCooking method changes GL: al dente pasta has a lower GL than overcooked pasta; cooled and reheated rice has a lower GL than freshly cooked rice due to resistant starch formation.
- Rank your foods by GL and identify the top two targetsOrder your five foods from highest to lowest GL. Focus first substitutions on the top two items—eliminating or reducing these delivers the largest reduction in daily insulin demand and produces the fastest visible results.Pro tipThe highest-GL item is frequently breakfast cereal or toast, which most people assume is a healthy low-fat start to the day. Replacing breakfast alone often eliminates midday energy crashes within days.
- Substitute the two highest-GL foods with satisfying low-GL alternativesReplace each high-GL staple with a genuinely satisfying low-GL alternative: cereal or toast → eggs or full-fat yogurt; white rice → cauliflower rice; bread → lettuce wraps. Plan the replacement before removing the original to prevent cravings from forming.Pro tipTrack hunger and energy at the two-hour mark after meals for two weeks. Lower-GL meals produce steadier energy and longer satiety—this immediate feedback reinforces the swap behaviorally.WarningRemoving high-GL foods without satisfying replacements is restriction, not substitution, and leads to cravings and rebound eating within days. Always plan the replacement first.
Dr. Unwin placed corn flakes, white rice, a potato, a banana, and a chocolate bar on the podcast table and asked host Stephen Bartlett to rank them by sugar-equivalent content. Bartlett assumed the chocolate bar would score highest. In reality, a typical bowl of corn flakes contained more sugar-equivalent teaspoons than the chocolate bar (8 vs. 7.5), and boiled white rice and a potato also exceeded expectations. Foods marketed as healthy or neutral carried higher glycemic loads than the designated treat food.
Watermelon has a high glycemic index score, leading many health-conscious eaters to avoid it entirely. However, because watermelon is primarily water, its glycemic load per realistic serving is low—you would need to eat a large volume to match the GL of a chocolate bar. Dr. Unwin uses this as a clinical teaching example to show why GI misleads: avoiding watermelon while eating large portions of rice or cereal is a worse metabolic trade, and only GL captures this distinction accurately.
Glycemic load was developed by academic nutrition researchers as an improvement over glycemic index. Its application to metabolic health and diabetes reversal was championed clinically by Dr. David Unwin, who uses sugar-equivalence visuals and GL tables to help patients grasp hidden blood-sugar impacts of everyday foods. Featured on The Diary Of A CEO.