Glycemic Load combines carbohydrate quality and portion size into one planning number. That makes it more useful than glycemic index alone when you are working with real servings, mixed meals, and training nutrition instead of isolated lab portions.
01Formula and practical math
| Item | GI | Available carbs per serving (g) | Serving mass | GL |
|---|---|---|---|---|
| Banana | 52 | 27 | 1 medium | 14 |
| Instant oats | 79 | 27 | 1 cup cooked | 21 |
| Cooked white rice | 73 | 45 | 1 cup cooked | 33 |
| Beans | 31 | 20 | 1/2 cup cooked | 6 |
Formula:
GL = GI × available carbs per serving ÷ 100
All values shift quickly with portion changes. Small serving lifts can move GL more than GI shifts.
02Resistance versus endurance comparison
| Objective | Session length | Preferred GL window before workout | Practical split rule |
|---|---|---|---|
| Resistance training block | 30 to 90 minutes | 10 to 20 in the pre-workout meal window | Keep pre- and post-session GL moderate to avoid heavy postural fatigue |
| Mixed strength plus conditioning | 60 to 120 minutes | 15 to 30 over 1 to 2 hours | Split around the session and add protein for recovery cadence |
| Endurance session | 75 minutes plus | 20 to 40 in the first 90 minutes before and during | Use repeatable spread, especially when duration is long |
03Timing around high-intensity and moderate days
| Day type | Pre-event tactic | Post-event tactic |
|---|---|---|
| High-intensity intervals | Add 15 to 25 GL within 60 to 90 minutes before effort | Follow with balanced protein and 10 to 20 GL if depleted by session end |
| Moderate intensity day | Keep pre-session GL lower and stable near maintenance range | Use 10 to 15 GL with 20 to 40 g protein for steady replenishment |
| Recovery day with no training stress | Choose a lower GL lunch and dinner pattern | Use GL as a behavior control dial instead of performance target |
For the food categories that consistently land in the low-GL window, see Top Low Glycemic Index Foods Ranked by What They Actually Do, which covers legumes, intact grains, low-GI fruit, and the cooking and pairing levers that change post-meal response.
Use serving sizes, blood sugar control, carbohydrate sources, and food logging to make GL repeatable rather than guess-based.
