One of the reasons apples are so healthy is they contain both soluble fiber (pectin) on the inside and insoluble fiber (cellulose) in the skin. The soluble fiber helps remove cholesterol from your body, slow down the absorption of glucose, and promote healthy bacteria in the colon. The insoluble fiber helps prevent constipation, hemorrhoids, and diverticular disease. The fiber and phytonutrients in apples may have heart health benefits, too. One study showed that women who ate about half a medium apple a day were at 43% lower risk to die from coronary problems.
The Healthy Aging Diet by Timothy Cole