title: Long-term consumption of beef extended with soy protein by men, women and children: I. Study design, nutrient intakes, and serum zinc levels.
abstract: The effect of long-term consumption, under practical conditions, of beef extended with soy protein on serum zinc levels of men, women and children was studied. Fifty-two families were randomly assigned to consume for 180 days 1 of 7 beef products: all beef, beef extended with either soy isolate, soy concentrate or soy flour (20% reconstituted soy product, 80% beef), or beef extended with each of the 3 soy products fortified with 60 mg Fe and 25 mg Zn/100 g protein. The beef product was consumed by the subjects as their principal source of protein for 1 meal a day (children 1-8 yrs) or 1-2 meals a day (11 per week) for adult men and women. A control group consumed their usual self-selected diet. Diet records (4-day) of all foods and beverages consumed by the subjects were obtained pre-study and 63 +/- 7 and 126 +/- 7 days for calculation of nutrient intakes. No deleterious effects were found on the serum zinc levels when subjects consumed beef extended with soy protein for 180 days.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000818:Animals; D002417:Cattle; D002648:Child; D004032:Diet; D004044:Dietary Proteins / Q000494:pharmacology*; D002149:Energy Intake; D005260:Female; D006801:Humans; D008297:Male; D008460:Meat; D008461:Meat Products; D009753:Nutritive Value; D010940:Plant Proteins / Q000494:pharmacology; D012737:Sex Factors; D013025:Glycine max; D015032:Zinc / Q000097:blood*
chemical_list: D004044:Dietary Proteins; D010940:Plant Proteins; D015032:Zinc