Green Apples are medium in size (approximately 2 ¼ inches across) and round-conical in shape, with some ribbing. The Green apple's white flesh is hard, crispy, and juicy. The flavor of Green apples is extremely acidic, sometimes to the point of not having other tastes, but generally refreshing. Green apples contain a compound called pectin, a fiber source that works as a prebiotic to promote the growth of healthy bacteria in your gut. The pectin found in green apples can help you break down foods more efficiently. The high fiber content in green apples can have other impacts on your digestive health as well.