Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term underweight refers to a human who is considered to be under a healthy weight. The definition is usually made with reference to the body mass index (BMI). A BMI of under 18.5 is usually referred to as underweight. This medical definition of underweight may differ from other uses of the term, such as those based on attractiveness.The most common cause of a person being underweight is primarily malnutrition caused by the unavailability of adequate food. The effects of primary malnutrition may be amplified by disease; even easily treatable diseases such as diarrhea may lead to death.

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