The principle of energy balance underpins the thermodynamic principle that energy cannot be destroyed but can only be:
The body weight of a human body may change over time if the energy intake is not equal to the energy dissipation.
This applies to the former life Nicholai was living because Nicholai ate too many snacks without exercising.
Now, since Nicholai is determined to change his former body status by performing the exercise:
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