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Achlorhydria A lack of hydrochloric acid in the digestive juices in the stomach.

Adenoma A benign epithelial tumor of glandular origin.

Adequate Intake The recommended average daily intake level of a nutrient based on observed or experimentally determined approximations or estimates of intakes that are assumed to be adequate for a group (or groups) of apparently healthy people; used when the Recommended Dietary Allowance cannot be determined.

Adipokines Cytokines, growth factors, and other proteins produced and secreted by adipose tissue.

Adipose tissue A connective tissue consisting chiefly of fat cells surrounded by reticular fibers and arranged in lobular groups or along the course of one of the smaller blood vessels.

Amenorrhea Abnormal suppression or absence of menstruation.

Anorexia The symptom of poor appetite whatever the cause.

Anorexia nervosa A psychophysiological disorder usually occurring in teenage women that is characterized by fear of becoming obese, a distorted self-image, a persistent aversion to food, and severe weight loss, and that is often marked by hyperactivity, self-induced vomiting, amenorrhea, and other physiological changes.

Antigen Any substance that stimulates an immune response in the body.

Antirachitic Cures or prevents rickets.

Asthma A chronic inflammatory disease of the airways.

Autism A complex developmental disability that typically appears during the first few years of life; is the result of a neurological disorder that affects the normal functioning of the brain, impacting development in the areas of social interaction and communication skills.

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