Apple skins contain approximately 65 percent of the fruit's fiber content.
They also contain 100 percent of an apple's quercetin content.
Quercetin is a phytochemical that has been linked with tumor cell inhibition, lower rates of cell proliferation in some cancers, and decreased levels of platelet aggregation (one of the factors behind heart disease.)
This is why I shed a silent tear whenever I see someone peel an apple and only eat the flesh.
FYI: When buying fruits with edible skins, my personal preference is to purchase organic varieties if possible.
Although quercetin can be purchased as a supplement by itself, remember that isolated phytonutrients are nowhere near as effective as when they work in tandem with other phytonutrients and antioxidants.
A medium-sized apple, for example, contains approximately 2,000 phytonutrients!