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We learn from the passage that underweight coupled with malnutrition ----.
Some underweight people enjoy an active,
healthy life, but others are underweight because
of smoking habits or poor health. An underweight
person, especially an older adult, may be unable
to preserve lean tissue during the fight against a
wasting disease such as cancer or a digestive
disorder, especially when accompanied by
malnutrition. Without adequate nutrient and
energy reserves, an underweight person will have
a particularly tough battle against such medical
stresses. In fact, many people with cancer die, not
from the cancer itself, but from malnutrition.
Underweight women may become infertile.
Exactly how infertility develops is unclear, but
contributing factors include not only body weight,
but also restricted energy and fat intake and
depleted body fat stores.