Effect of animal and plant protein intake on urinary phosphorus excretion in healthy young women

Objective : To determine the effects of animal and plant protein intake and protein restriction on phosphorus excretion in healthy young women. Methods : Healthy young women were divided into four groups: normal （ no dietary intervention ） , animal （ animal protein intake ） , plant （ plant protein intake ） , and low-protein （ protein restriction ） and subjected to a 3-day dietary intervention. Except in the normal group, vegetable intake was kept to a minimum to eliminate the effects of their constituent minerals. Based on the 3-day dietary records and 24-hour collected urine on day 3, the nutritional value, food group intake, and urinary components were evaluated. Results : There was no significant difference in the protein and phosphorus intake between the normal, animal, and plant groups. However, urinary phosphorus excretion was significantly lower in the plant and low-protein groups than that in the normal and animal groups; there was no significant difference between the plant and low-protein groups, with similar levels of phosphorus excretion. Magnesium intake and legume intake were significantly higher in the plant group compared to the other groups. Consideration & Conclusion : We showed that the plant protein diet reduced urinary phosphorus excretion to levels to that of the protein-restricted diet, while ensuring a protein to that of the animal protein diet. We hypothesize phytin related the form of