
28. Another Sign is Muscle Weakness and Joint Pain
Because it is so critical to building up and maintaining muscles, a protein deficiency can lead to muscle weakness and pain in the joints. This condition occurs mostly in older men and women, possibly because they are the most prone to experiencing a protein deficiency (via Harvard Health). They also tend to experience muscle loss when not consuming enough protein. Protein is also critical for joint health, so not getting enough can cause joint problems. Animal protein, in particular, is beneficial for joints (via Mind Body Green).