Which mineral, when taken with calcium, interferes with its absorption?

Answer 1

Phosphorus, which is typically found in protein-rich foods, tends to decrease the excretion of calcium in the urine. However, phosphorus-rich foods also tend to increase the calcium content of digestive secretions, resulting in increased calcium loss in the feces. Thus, phosphorus does not offset the net loss of calcium associated with increased protein intake (1). Increasing intakes of phosphates from soft drinks and food additives have caused concern among some researchers regarding the implications for bone health. Diets high in phosphorus and low in calcium have been found to increase parathyroid hormone (PTH) secretion, as have diets low in calcium.(3, 6) While the effect of high phosphorus intakes on calcium balance and bone health are presently unclear, the substitution of large quantities of soft drinks for milk or other sources of dietary calcium is cause for concern with respect to bone health in adolescents and adults

Answer 2

Iron

Answer 3

Vitamin D