What percentage of a healthy adult's body weight is fluid?

A. Traditional methods of food preservation—salting, sugaring, drying, and smoking—have been used for centuries and remain in use today. Salting draws moisture out of foods to inhibit bacterial growth. Sugaring, used in jams and candies, reduces water activity, making the environment unsuitable for microbes. Drying removes moisture, preventing spoilage, while smoking imparts flavor and introduces compounds that inhibit microbial growth. These methods were developed long before modern technology and continue to be effective, particularly in artisanal and emergency food preservation.

B. Stabilizers, texturizers, and emulsifiers are modern food additives used to improve texture, consistency, and appearance in processed foods, not traditional preservation methods.

C. Preservatives such as vitamin C (ascorbic acid) and vitamin E (tocopherols) are modern chemical methods to prevent oxidation and spoilage, and were not historically used prior to technological advances.

D. Mechanical refrigeration is a technological advancement that emerged in the 19th and 20th centuries. While highly effective, it is not considered a traditional method of food preservation.

A. This describes behaviors associated with binge-eating disorder, where individuals consume large amounts of food without engaging in compensatory behaviors such as purging or excessive exercise.

B. This describes bulimia nervosa, which involves recurrent binge eating followed by compensatory behaviors like self-induced vomiting, laxative use, or over-exercising to prevent weight gain.

C. Frequent overeating and rapid weight gain are not characteristic of anorexia nervosa. This pattern is more consistent with binge-eating disorder or general obesity-related behaviors.

D. Anorexia nervosa is a potentially fatal eating disorder characterized by self-starvation, extreme restriction of caloric intake, intense fear of gaining weight, and excessive weight loss. Clinical features often include emaciation, bradycardia, hypotension, hypothermia, electrolyte imbalances, amenorrhea in females, and hair or skin changes. Anorexia nervosa carries a high risk of medical complications, including cardiovascular collapse, osteoporosis, and death if untreated.