Underweight
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). Most consider individuals under 18.5 to be underweight, though some authorities use a higher value of 20. It is important to note that the BMI is a statistical estimate and some individuals classified as underweight may be perfectly healthy.
Underweight individuals generally have poor physical stamina and a weak immune system, leaving them open to infection[citation needed]. They are also at higher risk from heart disease, blood vessel disease, and osteoporosis[citation needed].
In women, being underweight can result in amenorrhoea (absence of periods) and possible complications during pregnancy.
The causes of being underweight can be:
Rapid metabolism
Poor diet or starvation (malnutrition)
Psychological problems (such as Anorexia nervosa, Body dysmorphic disorder, stress or anxiety)
Weight loss due to chronic illnesses
Hyperthyroidism
Drug use (e.g. Cocaine)
The treatment for an underweight individual is to increase the calorie intake so that more calories are consumed than are being used as energy. It is usually suggested weight training is also undertaken to increase muscle mass.
Source: Wikipedia
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