When one eats food, some of the food is excreted in solid form or in its liquid form; As such, it is impossible to gain exactly the amount of mass consumed.
The law of conservation of mass states that matter can neither be created nor destroyed by chemical reactions or physical transformations.
On this basis; it is impossible to gain exactly the amount of mass one consumes with each meal because some of the food consumed are given off and are therefore responsible for the deficit in mass gain.
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