What It Calculates
BMI (body mass index) — a simple ratio: body weight in kilograms divided by height in meters squared (kg/m²). It was created to quickly assess population weight trends — not an individual person's body composition.
📊 Categories (for adults)
| BMI | Category |
|---|---|
| Less than 18,5 | Underweight |
| 18,5–24,9 | Normal weight |
| 25,0–29,9 | Overweight |
| 30,0 and above | Obesity (with additional subclasses) |
For children and adolescents, age- and sex-specific tables (percentiles) are used, not adult categories.
⚠️ Where BMI Goes Wrong
- It does not distinguish muscle from fat: a muscular athlete may have "overweight" with a very low body fat percentage.
- It ignores body build: people with different bone structures look and feel different at the same BMI.
- It ignores fat distribution: abdominal fat (so-called visceral fat) is more dangerous than the same kilograms on the thighs.
- Age: in older age, muscle mass decreases, so at the same weight the proportion of fat may be higher.
- Pregnancy — BMI is not relevant.
✅ What to Use Alongside
- Waist circumference — the simplest additional indicator (a signal of abdominal fat).
- Body fat percentage — shows body composition more accurately (see body fat calculator).
- Waist-to-hip ratio — complements the picture of fat distribution.
- Strength and endurance results — health is also physical capacity, not just weight.
- How you feel: sleep, energy, mood — practically more important than a single number.
🙋 Frequently Asked Questions
Is BMI Suitable for Athletes? As a guideline, yes, but decisions should be made based on body composition and results, not on BMI.
Are normal ranges the same for everyone? Different countries and organizations may have slightly different thresholds.
Is it better to weigh yourself daily? Daily fluctuations are large (water); the weekly trend is more important (see ideal weight calculator).
💡 Practical Everyday Tips
📝 Monitor and Adjust
Keep a food diary for at least 2 weeks. What works for your body is individual. Review the results every month and adjust your strategy.
⏰ Consistency — More Important Than Perfection
Better 80% optimal nutrition every day than 100% one week and 50% the next. Consistency is the key to long-term results.
🔬 Individual Differences
What works for your training partner will not necessarily work for you. Genetics, microbiota, hormones — everything is individual.
📊 Measure Progress
Do not rely on the scale alone. Measure body circumferences, track strength indicators, and take progress photos every 4 weeks.
❓ Frequently Asked Questions
Q: Is this strategy suitable for beginners?
A: Yes! Start with the basic principles and gradually incorporate more advanced techniques. The most important thing is to start and be consistent.
Q: How quickly will I see results?
A: The first changes (energy level, well-being) — within 1–2 weeks. Body composition changes — within 4–8 weeks. Sports results — within 8–12 weeks.
Q: Do I need to take supplements for this to work?
A: No! Supplements are only a SUPPLEMENT to a balanced diet and proper training. First sort out your nutrition, sleep, and training — only then think about supplements.