Magnesium intakes, balances, and blood levels of adults consuming self-selected diets.

Magnesium balances and plasma and blood cell concentrations were determined in 34 men and women, 20 to 53 yr of age, during each season for 1 yr while they were consuming their customary diets. Dietary records were maintained 365 days. Analysis of variance indicated no seasonal variation in intake or balance.

Calcium and phosphorus intakes, balances, and blood levels of adults consuming self-selected diets.

Metabolic calcium and phosphorus balances, blood calcium and phosphorus levels, and alkaline phosphatase activity of 34 men and women, 20 to 53 yr of age, were determined each season during 1 yr while consuming customary diets. Dietary records were maintained 365 days. Analysis of variance indicated that serum Ca, P, and alkaline phosphatase levels were affected by season (p less than 0.

Plasma and urinary amino acids and selected sulfur metabolites in young men fed a diet devoid of methionine and cystine.

A preliminary investigation was conducted to explore the use of plasma methionine and cystine for determining human sulfur amino acid requirements. Measurements of urinary methionine, cystine, taurine, and inorganic sulfate were included. After a 3-day control period, three young men were fed for 8 days a diet containing a purified -l-amino acid mixture, patterned after egg protein but devoid of methionine and cystine.