Apple juice is rich in vitamin A, which helps in improve eye health. Vitamin A helps protect your eyes from eye diseases and keeps your vision sharp. When starting a diet, people often question which foods are healthy to eat and which ones are not. Not only do people want healthy, lowcalorie foods to eat, but they also want different types of beverages that are safe to consume on a diet. The low amount of calories in apple juice makes it a healthy choice for a beverage while dieting.