Zinc balance was studied during the last trimester of pregnancy in four teenagers. Diets composed of natural foods and mineral salts contained 10.5, 15.0 and 19.5 g nitrogen, and 26, 29 and 32 mg zinc. Urinary zinc was 2 % of daily total excretion and was relatively constant for a given subject. Dermal losses were larger than anticipated, 2.8 mg/day, and constituted about 11 % of daily zinc loss. Fecal zinc was 87 % of total daily loss, and varied within subjects and treatment groups. The magnitude of fecal zinc loss was dependent on the volume of fecal dry solids passed and zinc content of dry fecal material was remarkably constant within subjects and treatment groups. Balance for all subject-treatments was about 4 mg/day.

10.1159/000175538

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Citations (31)

SOME PHYSIOLOGIC CHARACTERISTICS OF ESTERS OF CETYL ALCOHOL

Canadian Journal of Biochemistry and Physiology (1959)

Doris Howes Calloway George W. Kurtz Rorert B. Potts

Palmitic, oleic, and butyric acid esters of cetyl alcohol were fed to mature rats. Cetyl palmitate was quantitatively excreted in the feces and produced no physiologic aberration. While cetyl oleate was 75% absorbable, it was of little value as an energy source and was partially excreted through the skin. Feeding of cetyl butyrate also induced seborrhea. Data on free fatty acids in gastrointestinal contents and on the specificity of seborrheic lipids indicate that cetyl esters are largely absorbed without hydrolysis, if the fatty acid moiety is readily absorbable, and excreted by way of the skin without modification.

Moiety

Oleyl alcohol

10.1139/o59-003

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Citations (2)

Nutritional Requirements in Parasitic Diseases

Clinical Infectious Diseases (1982)

Doris Howes Calloway

“Nutritional requirements” means different things in different contexts. Generally, the term refers to national or international standards or allowances of nutrients. Concern here involves the potential need for a change of standards where conditions of disease prevail, because disease increases the nutritional requirements of most individuals. “Nutritional requirements” may also be viewed in terms of food supplies. Analysis of a number of studies indicates that the average growth deficit due to endemic infectious diseases in early life is ⩽20 kcal per day (calculated as 5 kcal/g of tissue). Increased weight gain following treatment of intestinal parasites such as Ascaris lumbricoides or Giardia lamblia provides similar estimates, as does measurement of energy and protein absorption. These values are within normal variance estimates. Sick children do not eat well and apparently do not eat enough on healthy days to correct for the accrued food deficit. Research on nutritional requirements of children needs to focus on management of food resources in entire families.

Energy requirement

Parasitic Disease

10.1093/4.4.891

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Nutritional Value of Dehydrated Foods

Journal of the American Dietetic Association (1961)

Miriam H. Thomas Doris Howes Calloway

Value (mathematics)

10.1016/s0002-8223(21)15473-2

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Citations (30)