Unintentional weight gain is an increase in body weight that occurs when a person takes in more calories than the body needs or uses.
Weight gain can also be a significant symptom of several endocrine diseases such as Cushing syndrome or hypothyroidism. It may also indicate a heart or lung disorder.
A continued weight gain occurs with pregnancy, whereas a periodic weight gain may occur with menstruation. A rapid weight gain may be a sign of dangerous fluid retention.
Position of the American Dietetic Association: Weight Management. Journal of the American Dietetic Association. Feb 2009;109(2): 330-346.
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