Potassium Content

Grapefruit juice benefits your nervous and musculoskeletal systems due to its potassium content. Potassium plays a central role in nerve function. The flow of potassium out of your nerve cells helps trigger an electrochemical signal, called an action potential, that is essential for nerve communication. Action potentials also allow your nerves to interact with your muscle fibers, and potassium helps stimulate the muscle contractions required for muscle movement. You need to consume at least 4,700 milligrams of potassium each day, according to the Linus Pauling Institute. Freshly squeezed grapefruit juice made from 1 cup of grapefruit sections provides 310 milligrams, or 7 percent of the RDI.