+Weight gain is an increase in [Body Mass](/wiki/body_mass) over time, often resulting from a caloric surplus where energy consumed exceeds energy expended. Factors like [Diet](/wiki/diet), lifestyle, and genetics can contribute to this accumulation of body tissue.
+## See also
+- [Obesity](/wiki/obesity)
+- [Nutrition](/wiki/nutrition)
+- [Metabolism](/wiki/metabolism)
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