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The amount of air that enters or leaves the lungs during a normal respiratory cycle is the

Malnutrition that involves the diet alone is called secondary malnutrition.

Diuretics cause weight reduction by

Nutrients that are necessary for health and cannot be synthesized by human cells are called essential.

Niacin can be synthesized in human cells from the essential amino acid called tryptophan.

Obesity is defined as the presence of excessive adipose tissue.

Dietary fiber seems to inhibit the development of colon cancer by

The force that causes air to move into the lungs during inspiration is supplied by

As a group, the B vitamins are

Treatment with antibiotic drugs, which interfere with the activities of intestinal bacteria, is sometimes followed by a deficiency of