EAT (Exercise Activity Thermogenesis)
- Metabolism
- Energy Balance
- Training
By Mag. Christian Schönbauer, founder of Hardgainer Performance Nutrition®. Training since 1999, started under 50 kg.
EAT is the energy you burn through planned training: lifting, cardio, conditioning. Together with BMR, NEAT and TEF it makes up your TDEE. For a hardgainer or hard gainer one thing matters most: in a building phase, training is the stimulus for muscle, not a tool for burning calories.
Note
You get context here, not individual training, nutrition or therapy instructions. If you have a pre-existing condition or are unsure, please check with a doctor.
What is EAT? The definition in 20 seconds
EAT is everything you train on purpose. NEAT is all your other movement: walking, standing, stairs, fidgeting. You can plan and steer EAT, and it swings a lot between training days and rest days. How much your NEAT adds up to, the NEAT Calculator works out for you.
In your TDEE, EAT works like a dial: on training days your burn goes up, on rest days it goes down. For you as a hardgainer that means: EAT is not the goal. In a building phase you want the stimulus, not as many burned calories as possible.
- Plannable: you decide when and how hard you train. NEAT mostly runs without you noticing.
- Swinging: training days and rest days can easily be a few hundred calories apart.
- Part of the whole: EAT always works together with NEAT, TEF and BMR, never alone.
What decides how much you burn
- Duration: 60 minutes of lifting burn more than 30. Quality still comes before length.
- Intensity: hard sets close to failure or intervals burn more than an easy mobility session.
- Body weight: the more you weigh, the more you burn for the same activity.
- Type of training: roughly 200 to 400 kcal per hour of lifting, 400 to 600 for intervals, 200 to 300 for easy cardio. Guide values, depending on weight and pace.
Tip: wearables are often far off when it comes to calories burned. Use them for the trend, not as an exact number.
EAT in a building phase: the hardgainer view
In a building phase, training is a means to an end. You set stimuli for muscle, you do not burn calories for their own sake. Too much training can even hurt you: appetite drops, and the extra burn eats up your surplus.
- Lifting: 3 to 5 times a week, focus on progression and technique between MEV and MRV.
- Cardio: 1 to 2 easy sessions of 20 to 30 minutes for heart and recovery, not for burning calories.
- More training, more food: if you train more, add 150 to 300 kcal so your lean surplus stays intact.
- Recovery: with high volume close to your MRV, respect the SRA cycle. You steer intensity with RIR or RPE.
More training does not automatically mean more muscle. Why, is explained in Myth 2 on training volume.
Every cardio session eats muscle. If you want to build, you drop cardio completely.
The dose decides. One or two easy sessions a week fit well next to lifting. Cardio only becomes a problem when it eats your surplus or takes away your recovery.
Common questions
What is the difference between EAT and NEAT?
EAT is planned training, so lifting and cardio. NEAT is movement in daily life that you mostly do not even notice: walking, cleaning, fidgeting. You can plan EAT, NEAT mostly not.
Should I train more to raise my TDEE?
No. In a building phase the stimulus for your muscles counts, not the calories burned. Too much training brings exhaustion, less appetite and stalled progress.
Does cardio kill gains?
The dose decides. One or two easy sessions a week complement lifting well. A lot of cardio can slow recovery and eat up your surplus.
From term to practice: your tools
EAT is only one part of what you burn. For the full picture you also need your daily movement and a training plan that fits your recovery.
See all Hardgainer Tools. If you want more out of your numbers, go with Hardgainer Pro.
What the research says
Three papers behind the claims on this page
Training is the plannable part of what you burn, but not the biggest. These three papers put it in context.
- Resting metabolism makes up 60 to 75 percent of daily energy expenditure, digestion about 10 percent, movement 15 to 30 percent. Movement is the most variable part, and training is only a slice of it. Whether regular training also changes resting metabolism is disputed. Poehlman, Medicine and Science in Sports and Exercise, 1989
- In many people who do not train, movement-related expenditure is almost entirely NEAT. That makes NEAT the big, highly variable part of daily expenditure, and EAT the plannable one. Chung et al., Journal of Exercise Nutrition and Biochemistry, 2018
- After a large meal, trained subjects spent clearly less energy on digestion than untrained subjects, with the same resting metabolism. The body saves energy it needs for work. Tremblay et al., European Journal of Applied Physiology, 1983
What the studies do not cover
The digestion study is small and over 40 years old, the other two are reviews without their own measurements. None of them studied hardgainers. The calories per hour further up are guide values, not measurements for you.
What to take away: never look at EAT alone. Always steer it together with NEAT, TEF and enough energy.
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Reading & Resources
The terms right around EAT, and the pillars next to it.
Content here is general practice guidance and does not replace individual medical or nutritional advice.
