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An Apple A Day May Keep the Heart and Lung Specialists Away

Researchers at the University of California Davis Medical School studied how eating apples and drinking apple juice every day affects heart disease risk. The 12-week study showed that by simply including apples in the diet (and without making any other dietary changes), study participants were able to reduce their risk of heart disease. Apples contain a variety of antioxidant phytochemicals that decrease LDL oxidation. Oxidized LDL cholesterol is more likely to build up in arteries, a process that can cause heart attacks and stroke.

Researchers from the University of Nottingham, located in the United Kingdom, recently reported that people who eat five or more apples a week have better lung function and lower risk of asthma and other respiratory disease compared to people who rarely eat apples. Their findings were based on a 10-year study involving 2,633 people examining relationships between diet and respiratory health. The researchers suspect that antioxidants in apples lead to these health benefits. In 1997 Finnish researchers reported that the antioxidant flavonoids may reduce the risk of lung cancer. This finding is based on a 25-year study examining relationships between diet and health in nearly 10,000 Finnish men.

Want Healthier Lungs? Eat More Apples and Onions.

Researchers at the University of Hawaii studied 600 lung cancer patients and 600 cancer-free patients to see if dietary intake of quercetin, a phytochemical found in apples and onions, might reduce cancer risk. The researchers found a statistically significant reduction in lung cancer risk among the study participants who consumed the most quercetin from apples and onions. They found that participants who had consumed the most quercetin during their lives had the lowest risk of developing cancer. Results of this study were published in the Journal of the National Cancer Institute in January 2000.

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An Apple a Day

American Heart Association Dietary Recommendations

Apples & More from the University of Illinois

USDA 2000 Dietary Guidelines

It was probably your grandmother who always said, "An apple a day keeps the doctor away." And as researchers at Cornell University have found, granny said a mouthful.

Apples have already been linked to potential health benefits ranging from reduced risk of lung cancer to lower cholesterol. But now scientists have proof that eating apples can also help fight cancer.

An Apple a Day Keeps the Cancer Away

Apples have been around for the length of recorded history, and eating them has long been extolled as a habit leading to good health. Now a study published in the journal Nature has shown what it is about apples that makes them such a good choice. "I think one apple a day keeps the doctor away, but we are now able to say apples contain very strong antioxidant activity and anti-cancer activity," says Rui Hai Liu, assistant professor of food science at Cornell University and lead author of the study.

The anti-cancer activity Liu is referring to is made possible by substances called "phytochemicals," which are antioxidants that help fight cancer. Antioxidants work by intercepting free radicals, highly reactive molecules that can damage a cells membrane or DNA and render it more susceptible to cancer and other diseases.

Cornell researchers tested the anti-cancer activity of Red Delicious apples by studying what happens to cancer cells when they are exposed to both apple flesh and skin. They found that colon cancer cells were inhibited by 43 percent when treated with 50 milligrams of apple skin extract, and 29 percent when treated with flesh extract.

They also tested the apple extract with liver cancer cells. These cells were inhibited by 57 percent when treated with skin extract and 40 percent when treated with extract from the fruit’s flesh.

While it was previously thought that Vitamin C, a known antioxidant, might be responsible for this effect, this has turned out not to be the case. "Vitamin C in apples only provides a very small total of antioxidant activity," say Liu, noting that 100 grams of apples contains just 5.7 milligrams of Vitamin C. "But eating 100 grams of apples, like one serving of apples, provides you with a total antioxidant activity equal to 1,500 milligrams of Vitamin C."

The researchers say that for all fruits and vegetables, the total anti-cancer activity likely adds up to more than the sum of the parts. That’s because the whole fruit contains a complex combination of phytochemicals, including flavonoids and phenolic acids. It is this combination that makes eating apples better than taking individual vitamin supplements. Taking too many supplements can sometimes lead to toxic side effects, something that doesnt happen with fruit because the effect of small amounts of vitamins is enhanced by the interaction of the phytochemicals. Interestingly, the amount of phytochemicals varied from year to year, season to season, and region to region.

According to the U.S. Apple Association, in 1998 the average American ate about 19 pounds of fresh apples and more than 28 pounds of processed apples. There are about 80 calories in one medium apple, 90 calories in half a cup of apple sauce, and 120 calories in eight ounces of apple juice.

Apples have no fat or cholesterol, and they're high in fiber ~ a medium apple has about five grams. But you can only get the fiber from fresh apples, not juice or apple sauce.

The Cornell study, which was funded by the New York Apple Research Development Program and the New York Apple Association, is by no means the first research showing the health benefits of eating apples.

In 1997 a study published in the American Journal of Epidemiology involving almost 10,000 Finnish men found that eating apples appeared to reduce the incidence of lung cancer, due to a flavonoid called quercetin. Better lung function was also linked to eating about one apple a day in a study of 2,500 Welshman published in the British medical journal Thorax earlier this year.

Besides being beneficial to the lungs, apples have been shown to benefit the heart and brain, too. Last year, researchers at the University of California at Davis published findings in the journal Life Sciences which showed that apples and apple juice may help lower cholesterol buildupspecifically LDL, the "bad" cholesterolon artery walls. Last month, a study published in the European Journal of Clinical Nutrition following more than 9,000 Finnish men and women for more than 25 years showed that those who ate the most apples had the lowest risk of having a stroke.

But such benefits are not unique to apples. "I think all the fruits are very different ~ different fruits having different phytochemicals so I suggest people eat fruits and vegetables in a variety," says Liu. His group is now testing the anti-cancer activity of extracts from cherries, grapes, and cranberries.

In the meantime, the old adage still works. "I generally eat one apple a day," says Liu. "Sometimes I eat two."

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Guest bean_si (Not Active)

Ooh Good! I can get apples locally that are organically grown - even better. Thanks for the info.


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