If apples are red, experts claim, it’s because of their anthocyanins, which are largely restricted to the skin. When an apple is more uniformly red in color, or when its red color is deeper in hue, it’s because there are more anthocyanins. In terms of catechin polyphenols, epicatechin is the primary nutrient found in apples. The flavonoid phloridzin accounts for 98% of the flavonoids found in the apple seeds.

 The total polyphenol contents of apples range from about 1-7 grams/kilogram of fresh pulp, but this ratio gets much higher in the skin, underscoring the special value of apple skins for deriving optimal polyphenol benefits from this fruit. In fact, in animal studies, there is a very commonly used standardized apple extract called standardized apple peel polyphenol extract, or APPE.

Since most of the polyphenols in apples function as antioxidants, it’s not surprising to see so many health benefit studies focusing on the antioxidant benefits from apple.

Particularly strong is the ability of apples to decrease oxidation of cell membrane fats. This benefit is especially important in our cardiovascular system since oxidation of fat (called lipid peroxidation) in the membranes of cells that line our blood vessels is a primary risk factor for clogging of the arteries (atherosclerosis) and other cardiovascular problems.

Apples’ strong antioxidant benefits are also related to their ability to lower risk of asthma in numerous studies, and their ability to lower risk of lung cancer. In addition to their unusual polyphenol composition, apples also provides us with about 8 milligrams of vitamin C. While that amount is not a lot, it’s still important, especially since the recycling of vitamin C in our body depends on the presence of flavonoids and apples do an amazing job of providing us with those flavonoids.

Although some preliminary results show apple benefits for several different cancer types (especially colon cancer and breast cancer), it’s the area of lung cancer benefits that stand out in the apple research. There are numerous studies involving vegetable/fruit intake and risk of lung cancer. The number of subjects in these studies numbers into the high hundreds of thousands.

Although many research studies show an impressive ability of overall fruit and/or vegetable intake to lower lung cancer risk, very few individual fruits show up as protective against lung cancer. Except apples! It’s really quite remarkable how apples have been one of the few fruits to demonstrate this unique relationship with lung cancer risk reduction. (Interestingly, this same phenomenon has to some extent also been present in research on asthma).

Researchers aren’t certain why apples are so closely associated with reduction of lung cancer risk. Their antioxidant and anti-inflammatory benefits are definitely involved here, but they don’t fully explain why apples are such a standout in this health benefit area. We look forward to future research that will help shed light on this unique capacity in apples.

This may be good news for heavy smokers unable to kick the habit.  Perhaps, eating a red apple a day may prevent them from developing serious diseases caused by smoking.  I smoked for many years and able to quit for good about 20 years ago.  I’d like to believe that regularly eating red apples helped rehabilitate my lungs.

Read more on other health benefits of apples here.