11 October, 2012

Eating Apple Lowers Cholesterol Level


Apples were found to be more effective than a supplement containing an antioxidant found in the fruit
A new study suggests that eating apples each day could significantly improve the heart health of middle-aged adults in just one month.
Those who ate a daily apple over four weeks lowered ‘bad’ cholesterol in the blood by 40 per cent - a substance linked to hardening of the arteries.
Taking capsules containing polyphenols, a type of antioxidant found in apples, had a similar, but not as large, effect.
‘Bad’ cholesterol or low-density lipoprotein (LDL) can interact with free radicals to become oxidized, which can trigger inflammation and can cause tissue damage.
Research leader, Professor Robert DiSilvestro, from Ohio State University, said, “When LDL becomes oxidized, it takes on a form that begins atherosclerosis, or hardening of the arteries.
“We got a tremendous effect against LDL being oxidized with just one apple a day for four weeks.”
The difference was similar to that found between people with normal coronary arteries versus those with coronary artery disease, he said.
The study, funded by an apple industry group, is published online in the Journal of Functional Foods and will appear in a future print edition.
Prof DiSilvestro described daily apple consumption as significantly more effective at lowering oxidized LDL than other antioxidants he has studied, including the spice-based compound curcumin, green tea and tomato extract.
“Not all antioxidants are created equal when it comes to this particular effect,” he said.
DiSilvestro first became interested in studying the health effects of eating an apple a day after reading a Turkish study that found such a regimen increased the amount of a specific antioxidant enzyme in the body.
In the end, his team didn’t find the same effect on the enzyme, but was surprised at the considerable influence the apples had on oxidized LDL.
For the study, the researchers recruited non-smoking healthy adults between the ages of 40 and 60 who had a history of eating apples less than twice a month and who didn’t take supplements containing polyphenols or other plant-based concentrates.
In all, 16 participants ate a large Red or Golden Delicious apple for four weeks; 17 took capsules containing 194 milligrams of polyphenols a day for four weeks; and 18 took a placebo containing no polyphenols. The researchers found no effect on oxidized LDLs in those taking the placebo.
“We think the polyphenols account for a lot of the effect from apples, but we did try to isolate just the polyphenols, using about what you’d get from an apple a day,” DiSilvestro said.
“We found the polyphenol extract did register a measurable effect, but not as strong as the straight apple. That could either be because there are other things in the apple that could contribute to the effect, or, in some cases, these bioactive compounds seem to get absorbed better when they’re consumed in foods.”
Still, she said polyphenol extracts could be useful in some situations, “perhaps in higher doses than we used in the study, or for people who just never eat apples.”
The study also found eating apples had some effects on antioxidants in saliva, which has implications for dental health, she said.

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