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So what about "An apple a day keeps the doctor away"? In addition to plenty of water and small amounts of carbohydrates (fruit and grape sugar), apples contain about 30 other ingredients and low-concentration vitamins. Quercetin, which chemically belongs to the polyphenols and flavonoids and was formerly called vitamin P, proves to be a superfood in the apple. The antioxidant effect has been proven in numerous studies. Quercetin inactivates harmful oxygen particles called free radicals. If left unchecked, it causes oxidative stress in the body's cells, which is linked to numerous diseases.
Reduced cancer risk
In a study conducted by the Institute of Human Nutrition and Food Science at the University of Bonn, the active substance contained in apples had a positive effect on the health of people at risk for cardiovascular diseases: both blood pressure and the concentration of oxidized cholesterol damaging blood vessels declined. Apples also reduce the risk of cancer. Numerous studies indicate that apples help against lung and colon cancer, reports the German Cancer Research Center Heidelberg. Quercetin should also exert positive influence on the prostate and thus inhibit the growth of tumor cells.
But that's not all: studies published on the internet describe further health benefits. Secondary plant compounds inhibit inflammation, promote concentration and memory and enliven mental abilities in the elderly. A research project on molecular nutrition research at the Justus-Liebig-Universität Gießen suggests that quercetin counteracts senile dementia. A rejuvenating effect of plant polyphenols describes a doctoral thesis at the University of Hamburg: Within eight weeks, the skin of the subjects was demonstrably firmer and more elastic. Even in aged connective tissue cells, scientists have revived quercetin - but only in the test tube for the time being.
Defy the cold with apples
When common colds get around, vitamin C, as a natural ingredient in apples, strengthens the body's defenses. To absorb as much as possible, the fruits should be eaten with peel. Otherwise, the amount of vitamin C can be halved, as studies have shown. If apples are crushed, that too is at the expense of the vital substances. Grated fruit has lost more than half of vitamin C after two hours. Lemon juice may delay the removal. Natural vitamin C from apples and other fruits is preferable to artificial ones, for example in cough sweets. On the one hand, the active ingredient can be better absorbed by the body, on the other hand fruit contains many other health-promoting plant substances.