National Eat a Red Apple Day December 1. Close up of delicious red apples. Encouraging everyone to eat a red apple, as the adage goes, “an apple a day keeps the doctor away,” today is a perfect time to put that theory to taste. An apple is both delicious and nutritious, with over 7,500 varieties of apples and over 7.5% of the world’s production coming from the USA, apples are widely available.