Question

which of the following decreases absorption and bioavailability of calcium?
a oxalates
b inulin
c estrogen
d vitamin d

Explanation:

Oxalates can bind to calcium to form insoluble calcium - oxalate complexes, which reduces the absorption and bioavailability of calcium. Inulin is a pre - biotic, estrogen can increase calcium absorption in some cases, and vitamin D promotes calcium absorption.

Answer:

A. Oxalates