Washington: ‘An apple a day keeps the doctor away’ is an old proverb.
Now, researchers from the Chinese University of Hong Kong have reported the first evidence that the antioxidants abundant in the fruit could help extend the average lifespan by at least 10 percent.
The new results, obtained with fruit flies — stand-ins for humans in hundreds of research projects each year — bolster similar findings on apple antioxidants in other animal tests.
Zhen-Yu Chen and colleagues said that damaging substances generated in the body, termed free radicals, cause undesirable changes believed to be involved in the aging process and some diseases.
Substances known as antioxidants can combat this damage.
Fruits and vegetables in the diet, especially brightly coloured foods like tomatoes, broccoli, blueberries, and apples are excellent sources of antioxidants.
A previous study with other test animals hinted that an apple antioxidant could extend average lifespan.
In the current report, the researchers studied whether different apple antioxidants, known as polyphenols, could do the same thing in fruit flies.
They found that apple polyphenols not only prolonged the average lifespan of fruit flies but also helped preserve their ability to walk, climb and move about.
In addition, apple polyphenols reversed the levels of various biochemical substances found in older fruit flies and used as markers for age-related deterioration and approaching death.
The researchers said that the results support those from other studies, including one in which women who often ate apples had a 13-22 percent decrease in the risk of heart disease.
The study appears in ACS``s Journal of Agricultural and Food Chemistry.