Protein utilization by young women consuming animal or plant protein diets at various levels of vitamin B-6 intake.
Eight young women consumed a vitamin B-6 depletion diet (egg albumen formula, less than 0.05 mg vitamin B-6/d) for 11-28 d. Subjects (n = 4) then consumed either animal protein (AP, mainly dairy and poultry products) or plant protein (PP, mainly various types of beans) diets with increasing vitamin B-6 intake (0.5, 1.0, 1.5, and 2.0 mg/d) for periods of 14-21 d. All diets provided 1.55 g protein/kg body wt. Apparent protein digestibility of AP (94.6%) was significantly higher than that of PP (88.4%) diets (p less than 0.001). Protein digestibility was not significantly affected by vitamin B-6 intake. Apparent nitrogen balance of subjects consuming AP diets was slightly, though not significantly, higher than that of subjects fed PP diets. N balance was not influenced by vitamin B-6 intake. Data suggest that short-term low vitamin B-6 intake does not affect protein utilization in humans as determined by digestibility and N balance.
Hudson
C A
CA
Western Regional Research Center, US Department of Agriculture, Albany, CA 94710.
Betschart
A A
AA
Turnlund
J R
JR
Kretsch
M J
MJ
Sauberlich
H E
HE
D000328:Adult; D004044:Dietary Proteins / Q000008:administration & dosage* / Q000378:metabolism; D004063:Digestion; D005260:Female; D006801:Humans; D009584:Nitrogen / Q000378:metabolism; D010940:Plant Proteins / Q000008:administration & dosage; D011736:Pyridoxine / Q000008:administration & dosage*
D004044:Dietary Proteins; D010940:Plant Proteins; D011736:Pyridoxine; D009584:Nitrogen