Abstract
Three, 4-wk controlled feeding periods were used to assess calcium and zinc balance, and urinary hydroxyproline during consumption of a baseline diet, and the baseline diet with the addition of either a high-oxalate (spinach) or a low-oxalate vegetable (broccoli) in 8 premenopausal women. Calcium intake increased approximately linearly from baseline (795 mg) to the broccoli diet (905 mg) to the spinach diet (997 mg) and the corresponding mean calcium balances were 18, 19, and −65 mg/day, respectively. Mean apparent calcium absorption was significantly lower (p