Potassium deficiency may lead to muscular cramps, twitching, and irregular heartbeat . Fuji Fuji apples have a sweet flavor, a yellow and red peel, and a juicy, crisp texture — all factors that may contribute to their widespread popularity . In several studies, Fuji apples consistently show a higher polyphenol content than other apple varieties . One animal study determined that polyphenols from Fuji apples may help prevent heart and liver injury by lowering blood cholesterol levels and improving liver enzyme markers . One test-tube study also found that Fuji apple extract affected liver cells to improve glucose metabolism. Anthocyanidins are the pigments responsible for red, blue, and purple hues in fruits and vegetables. What’s the Healthiest Apple? 5 of the Best Types Apples are a nutritious, tasty choice full of beneficial plant compounds and dietary fiber. It supports your bones and teeth while regulating nerve and muscle function . Granny Smith You may easily recognize Gran...