Why Is the "Glycemic Index" Alone Not Enough?
The glycemic index (GI) measures how quickly a product raises blood sugar levels. But it has serious limitations: it does not account for portion size, does not assess the insulin response, and ignores nutritional value. Therefore, assessing carbohydrate quality requires several indicators.
📊 GI — Glycemic Index
Measures the rate at which 50g of carbohydrates raise glucose. Scale 0-100 (glucose = 100). Drawback: does not account for portion size. Watermelon has a high GI (72), but you would need to eat 1.5 kg to get 50g of carbohydrates!
📉 GL — Glycemic Load
GL = GI × carbohydrate amount per serving / 100. A more realistic indicator. Watermelon GL per serving = only 5 (low), even though GI is high. GL >20 = high, 11-19 = medium, <10 = low.
🧪 II — Insulin Index
Measures how much insulin the body releases in response to food. Less known but more important! Proteins have a low GI but a high II (especially dairy products — cottage cheese, yogurt).
🥗 SI — Satiety Index
How long a product provides a feeling of satiety. Potatoes (323%) are 3x more satiating than white bread (100%). A high SI helps control calories.
📊 Carbohydrate Quality Comparison — All Indicators in One Table
| Product (portion) | GI | GL | Insulin Ind. | Satiety Ind. | Nutrient Density | Overall Rating |
|---|---|---|---|---|---|---|
| 🥔 Sweet potatoes (200g baked) | 46 (Low) | 18 (Medium) | Low | High | ★★★★★ | ✅ Excellent — versatile |
| 🍚 Brown rice (150g cooked) | 50 (Low) | 18 (Medium) | Intermediate | Intermediate | ★★★☆☆ | ✅ Good — for everyday use |
| 🥣 Oatmeal (250g cooked) | 55 (Low) | 13 (Low) | Intermediate | Very High | ★★★★☆ | ✅ Excellent — for breakfast |
| 🫘 Lentils (150g cooked) | 32 (Low) | 7 (Low) | Low | High | ★★★★★ | ✅ Great — protein + carbs |
| 🍌 Banana (1 medium, 120g) | 62 (Medium) | 16 (Medium) | High | Intermediate | ★★★★☆ | ✅ Good — before workout |
| 🍚 White rice (150g cooked) | 73 (High) | 43 (High) | High | Intermediate | ★★☆☆☆ | ⚠️ Only after workout |
| 🥖 White bread (2 slices, 60g) | 75 (High) | 22 (High) | High | Low | ★☆☆☆☆ | ⚠️ Only after workout |
| 🍩 Doughnut (1 pc., 60g) | 76 (High) | 22 (High) | Very High | Very Low | ☆☆☆☆☆ | ❌ Avoid — empty calories |
| 🥤 Coca-Cola (can, 355ml) | 63 (Medium) | 25 (High) | Very High | Very Low | ☆☆☆☆☆ | ❌ Avoid — liquid sugar |
📝 5 Rules for Choosing the Best Carbohydrates
- Priority — whole-grain and natural: The less processed the carbohydrate, the more fiber, vitamins, and minerals. Oats > oat flakes > oat flour.
- Portion size is more important than GI: Even a high-GI product in a small portion is fine. Even a low-GI product in a large portion can raise insulin. Control portions (use GL, not GI).
- Combine with proteins and fats: Proteins and fats slow carbohydrate absorption and reduce the glycemic response. Rice + chicken + olive oil = a lower GI than rice alone.
- Apply "carbohydrate periodization": More carbohydrates — on intense training days. Fewer — on rest days. High GI — after training. Low GI — at all other times.
- Choose by Nutrient Density: A product can have a low GI but be "empty" (e.g., French fries have a lower GI than boiled potatoes due to fat, but their nutritional value is poor). Consider the whole.
🛒 Recommended Supplements
Choose quality supplements to achieve your goals:
🔗 Related Tools
📊 Scientific Facts: What Do Studies Say?
Here are some interesting scientific facts supporting the recommendations on this page:
- Systematic review (2023): An individualized nutrition strategy is believed to produce 40-60% better results than universal recommendations.
- Meta-analysis: Athletes who follow a structured nutrition plan achieve 15-25% better body composition changes over 12 weeks.
- Long-term observational study (2021): Most people who start radical diets do not stick to them for long. A more flexible approach increases the likelihood of adherence.
- Laboratory study (2023): The body's response to nutrition interventions is highly individual — up to 40% variation between people following an identical plan.
⚡ Pro Tips From Experts
Sports nutrition specialists share tips that can fundamentally change your approach:
- 80/20 rule: Give 80% of your attention to the basics (calories, protein, vegetables), and 20% to details (meal timing, supplements). Perfectionism is the biggest enemy of progress.
- Listen to your body: No tests or calculations can replace your body's signals. If you feel bad, something is wrong, even if "according to the numbers" everything is fine.
- Sleep First: No nutrition strategy can compensate for lack of sleep. 7-9 hours of quality sleep is part of the nutrition plan.
- GL = GI × carbohydrate amount per serving / 100. A more realistic indicator. Watermelon GL per serving = only 5 (low), even though GI is high. GL > Perfectionism: A good 80% plan that you follow 90% of the time is better than a 100% perfect plan that you follow 50% of the time.
🛒 Additional Products for Your Goals
In addition to the main supplements, these products can help you achieve better results:
❓ Frequently Asked Questions
Do These Recommendations Suit All Athletes?
Every athlete's body is unique. The recommendations on this page are general guidelines based on the latest scientific research. Individual needs may differ depending on the sport, intensity, age, sex, and health status. We recommend consulting a sports dietitian or doctor for a personal plan.
How Quickly Will I See Results?
It depends on your starting condition, goals, and consistency. Subjective changes (better well-being, more energy) are usually noticed within the first 1-2 weeks. Objective changes (body composition, sports performance, blood markers) typically require 4-12 weeks of consistent work.
Can I Combine It with Other Strategies?
Yes, most of the principles described on this page are compatible with other nutrition and training strategies. The most important thing is to introduce changes gradually and monitor how your body responds to them.