Unintentional weight loss can occur when body fats, body fluids and muscle atrophy are lost from the body. Weight loss is considered a problem when 10% of an individual's weight is lost within a period of six months, or even 5% in one month.
Body Mass Index is a reliable way to measure a person's weight.
Weight loss can be caused by anxiety or depression, bowel diseases and an overactive thyroid.
If a person is bulimic, this can also result in weight loss.
Weight loss combined with a lack of nutrition can result in a chronic illness called cachexia.
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