How many protein shakes is it safe to drink in one day?

There is no magic number for how many protein shakes to safely drink per day, because people fall into different health-related categories, each with a recommended daily protein requirement. Someone trying to build muscle, who's spending considerable time on strength training exercises, can shoulder a heavier protein load than someone who's inactive, for example.

However, consuming too much protein, in general, whether in a shake or otherwise, can lead to health problems, such as kidney stones and various cancers, according to Men's Health magazine..

Whey protein, a common ingredient in protein shakes, should not be taken in excessive amounts, only in doses that the manufacturer recommends, notes WebMD.