Your body always tries to use the least energy possible to do what it needs.
Evidence from Studies
Supporting (2)
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Human locomotion over obstacles reveals real-time prediction of energy expenditure for optimized decision-making
People naturally choose the easiest way to walk over obstacles to use the least energy, even before they get there — showing our bodies are built to save energy.
The study says our bodies have an old survival trick that slows down metabolism when we eat too much sugar, to save energy—this shows our bodies are built to use as little energy as possible when times are tough.
Contradicting (1)
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Effects of fructose-containing caloric sweeteners on resting energy expenditure and energy efficiency: a review of human trials
The study found that fructose (a type of sugar) wastes more energy when the body processes it, which means our bodies aren't perfectly tuned to save energy — contradicting the idea that we're evolutionarily optimized to use as little energy as possible.