They also include a lot of soluble fiber, which can help lower cholesterol and prevent heart disease. Every apple has fiber and phytonutrients, but not all apples are made equal. The type of fiber in apples helps control blood sugar levels after eating, so choose varieties that are high in beta-carotene and vitamin C. Green apples are best because they're unblemished with no bruises, and red apples are desirable because they have deeper colors that indicate their taste and texture will be better. Avoid apples that are waxed or coated in plastic because these items will leave a film on the fruit that contains pesticide residues. The most toxic part of an apple is its seed, which grows into a pod that contains hundreds of tiny seeds. Apple seeds contain tryptophan, which can cause problems for people who suffer from allergies or anxiety. Eating too many apples may lead to insomnia due to the sleep-inducing properties of fiber. However, most of the fiber found in apples is soluble so should not cause issues for most people. Apples are a good source of vitamin K, calcium, phosphorous, and magnesium. They also provide potassium, which plays a role in maintaining healthy blood pressure and nerves/muscles function. Apples are low in sodium and contain only 4 grams of carbohydrate per apple.