EAT, exercise calorie expenditure explained. The only TDEE bucket you can decide to raise, and the one wearables measure most poorly.

EAT, the E in the daily calorie puzzle

Your body burns calories continuously, even still. The sum of all that expenditure over 24 hours is called the TDEE (Total Daily Energy Expenditure). It breaks down into four clearly distinct bricks, each with its own physiology and its own calculation method. EAT is one of them.

EAT is precisely the share tied to planned exercise : a strength training session, a jog, an hour of tennis, cycling, yoga. What steps out of involuntary daily life and what separates from rest. Everything you make move on top of the day’s strict minimum falls here.

The gap with NEAT is sharp: walking to the subway, climbing stairs, standing at your desk, none of that is EAT, it is NEAT. EAT begins when you consciously decide « I am training » and you book a slot in your calendar for it. This distinction is what makes EAT both easy to motivate mentally, and hard to measure correctly.

What happens when you move

During effort, your muscles burn ATP at an accelerated rate. To rebuild that ATP, your body mobilises three energy pathways: the anaerobic alactic system (very short, explosive), the anaerobic lactic system (intense efforts up to 2 minutes), and the aerobic system (beyond, oxidation of carbs then fats). The exact blend depends on intensity and duration.

This whole process burns oxygen and releases heat. Indirect calorimetry measures that oxygen consumption (VO2) and converts it into kilocalories. It is the scientific reference for quantifying EAT, and it is also the foundation of the MET tables used in real life.

Beyond the session itself, there is a delayed effect called EPOC (Excess Post-exercise Oxygen Consumption). For several hours after an intense effort, your metabolism stays elevated to repair muscle micro-tears, rebuild glycogen stores and restore homeostasis. EPOC adds 5 to 15 % to the session itself, more after HIIT, little after a quiet walk.

Practical consequence: the same hour of sport can cost 200 kcal or 700 kcal depending on the pathway used, the muscle mass engaged, and the intensity. That is why a single generic figure « 1 hour of sport = X kcal » makes no sense.

What works, what does not work to measure EAT

Three big families of methods coexist. One is precise and inaccessible. One is rigorous and usable. One is convenient and misleading.

The wearables problem is not the hardware, it is the formula. Heart rate can rise for non-muscular reasons (stress, coffee, heat, dehydration). And the accelerometer cannot tell a « useful » movement from a parasitic one. Lean deliberately takes the opposite stance: you declare your session and its effective duration, and the app computes from the real MET + your personalised metabolism.

The four levers that move EAT

For the same session displayed as « 1 hour of sport », real expenditure varies by a factor of 1 to 3 between two people. Four parameters explain most of that gap.

Practical conclusion: a 90 kg man doing 45 effective minutes of strength training at 4 MET burns about 280 kcal of EAT. The same trained man doing 60 minutes of jogging at 10 km/h, 10 MET, burns 945 kcal. For a 60 kg woman on the same jogging session: 630 kcal. These are orders of magnitude, not promises to the gram.

EAT weighs less than you think

This is probably the most counter-intuitive result in the physiology of calorie expenditure: EAT, the bucket everyone thinks of first when talking about « burning calories », is in fact the smallest bucket of TDEE for most people.

Order of magnitude over a full day, for a moderately active 80 kg man:

Strategic consequence: adding 3,000 steps a day (about 120 kcal of extra NEAT) over a week often beats adding one weekly sport session. That is not a reason to drop training (cardiovascular health and muscle mass depend on EAT), but it is a reason not to rely on it alone for fat loss.

Lean compared to Yazio on EAT: the ×10 gap

Most trackers inflate EAT. Yazio illustrates the problem: for a 60 minute strength training session, the app displays nearly 2,000 kcal burned. This is physiologically impossible for a human who is neither a pro cyclist nor an ultra-trailer.

Strength training MET source: Ainsworth BE et al., 2011 Compendium of Physical Activities, Med Sci Sports Exerc, 2011 ; 43(8) : 1575 à 1581. MET musculation générale = 3,5 à 6,0 selon l’intensité. Calcul : kcal/min = MET × 3,5 × poids(kg) / 200.

The point is not to minimise your effort, it is to spare you from eating an extra meal out of compensatory illusion. Precision on EAT is the silent condition of any success in a calorie deficit.

The Lean pipeline: BodyScan, patented BMR, MET, adaptation

Lean is the app that computes EAT best for a simple reason: its EAT relies on a BMR personalised on your real bodyfat, not on a 1990 equation pulled from your raw weight. Four steps in a row:

Concrete result: for a 60-minute strength training session with 35 effective minutes under tension, Lean will display about 220 kcal of EAT for a moderately active 80 kg man. MyFitnessPal or Apple Watch will frequently show 450 to 600 kcal for the same session. The gap is the error, and that gap is what keeps fat loss from working over time.

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EAT FAQ

When I run, do my steps count twice (NEAT + EAT)?

No. It is a classic trap on basic trackers. A 45 minute running session will move 6,000 to 8,000 steps that appear in your NEAT. If the run is also logged as EAT, you double count. Lean detects the temporal overlap: during the recorded session window, the corresponding steps are removed from NEAT to avoid double counting. Result: your daily TDEE stays accurate, not inflated.