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...t) is a state in which an individual consumes fewer [[calories]] than they expend, leading to [[weight loss]]. ...Surplus]]: A state in which an individual consumes more calories than they expend, leading to weight gain.

...icit]]: The state in which an individual consumes fewer calories than they expend, leading to weight loss.

...o stabilize the fish at different depths in the water without it having to expend energy in swimming. The swim bladder does this by varying the amount of gas