Bone, muscle, and fat: sex-related differences in prepubertal children.

PURPOSE: To determine whether there are sex-related differences in vertebral cross-sectional dimensions, in paraspinous muscle area, and in the amount of fat in the subcutaneous and visceral compartments of prepubertal boys and girls. MATERIALS AND METHODS: Subcutaneous fat, visceral fat, paraspinous musculature, and vertebral cross-sectional dimensions were studied in 31 pairs of prepubertal healthy white girls and boys 5-10 years of age, rigorously matched for age, height, and weight. Data were analyzed with the Student t test and multiple regression analysis. RESULTS: Sex had a differential effect on fat accumulation and musculoskeletal development. Compared with boys, girls had, on average, 28% greater total fat and 30% higher subcutaneous fat (P <.001 for both), but 10% less paraspinous musculature (P =.002) and 15% smaller vertebral cross-sectional dimensions (P <.001). In contrast, the sexes were monomorphic for visceral fat (P =.24). Stepwise regression analysis indicated that only 22% of the difference in vertebral cross-sectional area could be explained by sex-related differences in paraspinous musculature. CONCLUSION: Together, these data indicate that sex is an important determinant of the morphology in humans well before the beginning of puberty.

Position of the American Dietetic Association: ethical and legal issues in nutrition, hydration, and feeding.

It is the position of the American Dietetic Association that the development of clinical and ethical criteria for the nutrition and hydration of persons through the life span should be established by members of the health care team. Registered dietitians should work collaboratively to make nutrition, hydration, and feeding recommendations in individual cases. Registered dietitians have an active role in determining the nutrition and hydration requirements for individuals throughout the life span. When patients choose to forgo artificial nutrition and hydration, or when patients lack decision-making capacity, and others must decide whether or not to provide artificial nutrition and hydration, the registered dietitian has an active and responsible professional role in the ethical deliberation around that decision. There is strong clinical, ethical, and legal support both for and against the administration of food and water when issues arise regarding what is or is not wanted by the patient and what is or is not warranted by empirical clinical evidence. When a conflict arises, the decision to administer or withhold nutrition and hydration requires ethical deliberation. The registered dietitian's understanding of nutrition and hydration within the context of nutritional requirements and cultural, social, psychological, and spiritual needs provides an essential basis for ethical deliberation on issues of nutrition and hydration.