Question 1

What is the Mifflin-St Jeor equation and why is it recommended?

Accepted Answer

The Mifflin-St Jeor equation is a validated formula for estimating BMR published in 1990 and recommended by the Academy of Nutrition and Dietetics as the most accurate predictive equation for non-obese adults, with a mean error of approximately 10% compared to gold-standard indirect calorimetry. For males: BMR = 10W + 6.25H − 5A + 5. For females: BMR = 10W + 6.25H − 5A − 161. It outperforms the older Harris-Benedict equation (1984 revision) in accuracy across diverse populations.

Question 2

How do I interpret the weight loss and weight gain targets?

Accepted Answer

Weight loss target is your TDEE minus 500 kcal/day — a deficit that produces approximately 0.5 kg (1 lb) of fat loss per week according to the 7,700 kcal/kg equation. Weight gain target is TDEE plus 300–500 kcal/day for lean muscle gain (a 'lean bulk'). These are starting estimates; adjust based on actual weight changes over 2–3 weeks. If you are losing more than 1 kg/week, increase intake slightly to preserve muscle.

Question 3

Which activity level should I select if I work a desk job but exercise regularly?

Accepted Answer

Select 'Lightly Active' (1.375) if you exercise 1–3 days per week, or 'Moderately Active' (1.55) for 3–5 days. Many fitness professionals recommend erring on the side of lower activity factors — particularly avoiding 'Very Active' unless you do hard training 6–7 days per week. It is more reliable to track your actual intake and weight for 2 weeks and adjust your TDEE estimate based on real-world data than to rely solely on the activity multiplier.

Question 4

What is the difference between BMR and TDEE?

Accepted Answer

BMR (Basal Metabolic Rate) is the calories your body burns at complete rest to maintain vital functions. TDEE (Total Daily Energy Expenditure) includes BMR plus three additional components: Exercise Activity Thermogenesis (EAT — calories burned during planned exercise), Non-Exercise Activity Thermogenesis (NEAT — calories burned through daily movement like walking, fidgeting, and chores), and the Thermic Effect of Food (TEF — energy used to digest and metabolize food, approximately 8–10% of calories consumed). TDEE is always higher than BMR; the multiplier captures EAT and NEAT, while TEF is implicitly included.

Question 5

Is the Mifflin-St Jeor equation accurate for very muscular or obese individuals?

Accepted Answer

For muscular individuals, Mifflin-St Jeor tends to underestimate BMR because it uses total body weight rather than lean body mass. Athletes may have actual BMRs 5–15% higher than predicted. The Katch-McArdle formula (BMR = 370 + 21.6 × lean body mass in kg) is more accurate for those with known lean mass. For individuals with obesity (BMI > 35), Mifflin-St Jeor performs reasonably well, though actual metabolic adaptation from years of dieting can cause actual TDEE to be 10–15% lower than predicted.

Question 6

Why does TDEE change when I lose or gain weight?

Accepted Answer

As body weight decreases, both BMR and TDEE decrease proportionally — a lighter body requires fewer calories to sustain. This is why weight loss tends to stall over time: as you lose weight, your TDEE drops, and the same calorie intake that produced a deficit no longer does. This is not just metabolic adaptation — it is a mathematical consequence of reduced body mass. Recalculating TDEE every 4–6 weeks and adjusting calorie targets accordingly is essential for continued progress.

Question 7

What does NEAT mean and why does it vary so much between people?

Accepted Answer

NEAT (Non-Exercise Activity Thermogenesis) is the calories burned through all movement that is not planned exercise — walking, typing, standing, gesturing, and even unconscious fidgeting. NEAT varies by 300–2,000 kcal/day between individuals of similar size and activity level. Research by Dr. James Levine at Mayo Clinic found that lean individuals naturally move significantly more throughout the day than obese individuals, even with matched formal exercise. Increasing NEAT by standing more, walking during calls, and using stairs is one of the most underrated tools for weight management.

Question 8

How accurate is my TDEE calculation and how should I use it?

Accepted Answer

TDEE equations have a mean error of 10–15% compared to doubly-labeled water measurements (the gold standard). This means your actual TDEE could be 200–350 kcal above or below the calculated value. The most reliable approach: use this calculator as a starting point, then track your actual food intake and body weight for 2–3 weeks. If weight is stable, your actual TDEE equals your average intake. If losing, add 100–200 kcal/day; if gaining unintentionally, reduce by 100–200 kcal/day. Real-world data always beats theoretical estimates.

TDEE Hesaplayıcısı — Toplam Günlük Enerji Harcaması

TDEE Hesaplayıcısı Nedir?

TDEE Hesaplayıcısı Formülü

TDEE Hesaplayıcısı Örneği

TDEE Hesaplayıcısı Nasıl Kullanılır

TDEE Hesaplayıcısı Neden Önemlidir

Sınırlamalar ve Doğruluk

Pratik İpuçları

Sıkça Sorulan Sorular

Yolculuğuna Devam Et

Güvenilir Kaynaklar ve Metodoloji

API Erişimi