Health Benefits of Garlic, Prevention of Aorta and others
According to a new study research from Ohio in Columbus, a healthy dose of garlic in the diet may help prevent hardening of the aorta, the major artery that carries blood from the heart.
The aorta hardens naturally with age, but a more elastic aorta is beneficial because it conducts blood smoothly from the heart and puts less stress on other organs.
HarisiosBoudoulas, professor of internal medicine and pharmacy at Ohio State University, collaborated with researchers from the Centre for Cardiovascular Pharmacology in Mainz, Germany, including the Centres director, professorGustzvBelz. They measured the stiffness of the aorta in more than 200 German men and women, half of whom took 300 mg or more of standardized garlic powder in tablet form every day for two years.
The subjects who took garlic supplements demonstrated a 15 percent lower average aortic stiffness than subjects who did not.
The aortas of our 70-year-old subjects who took garlic were as elastic as the aortas of 55-year-old subjects who didn’t take garlic, said Boudoulas. He and the German researchers published their results in a recent issue of the journal Circulation.
The aorta is the large, branching artery that delivers oxygen-rich blood from the heart to the rest of the body. Boudoulas explained that a healthy, elastic aorta billows outward with each pulse. As it relaxes, blood flows smoothly to outlying arteries and organs. Doctors have known this for some time, but until recently, none had investigated the effect of aortic elasticity on health.
Prior to a few years ago, the aorta was considered nothing more than a pipe that transferred blood from the heart to other organs, but now we know that it’s a dynamic organ in itself. The aorta helps keep other organs healthy, because it regulates the velocity of the blood that travels through the blood vessels with each pulse, said Boudoulas.
Boudoulas said that when the aorta loses its elasticity, it can’t expand to accommodate blood, and each pulse from the heart squeezes straight through the narrowed passage at high speed, which puts stress on the body.
Every time the heart contracts, it gives stress to the aorta, said Boudoulas. We’ve done some studies here at Ohio State to suggest that as we get older, the first organ to suffer is the aorta.”
The aorta stiffens naturally with age. For men, the process begins in their early 50s, and for women, after menopause.
The subjects in this study were healthy, nonsmoking men and women ranging in age from 50 to 80 years. Both groups — with garlic and without — were made up of a roughly equal number of men and women.
Boudoulas and his colleagues measured the velocity of the blood pressure wave through the aorta, called the pulse wave velocity (PWV), for each patient in the study, by recording the amount of time pulses of blood from the heart took to reach the femoral artery in the leg.
Researchers measured the PWV for subjects at rest and during mild exercise. On the average, the stiffness of the aortas of subjects in the garlic group measured 15 percent less. “The effect was larger than we had expected, and the effect was most pronounced in the older age groups,” said Boudoulas.
The positive effect of garlic was more than 3.5 times higher in the 60-69 age group than it was in the 50-59 age group. In the 70-80 age group, the effect was more than 4 times higher. Boudoulas said this may reflect that the fact that in younger people the aorta is more or less functioning normally regardless of garlic intake.
The subjects of this study consumed garlic tablets, but Boudoulas said that the benefits of garlic are the same whether it’s taken in pill form or in food. He added that the only side effect of eating garlic is the odor, which people can eliminate by taking pills.
It’s difficult to say at this time whether everybody should increase their garlic intake, said Boudoulas. But the data we have so far very strongly suggests that it prevents stiffening of the aorta.
Boudoulas said that maintaining a healthy aorta may prevent age-related damage to other organs. When the pulse wave velocity is not too fast, it prevents damage to other organs like the brain and kidneys, said Boudoulas. So maintaining a healthy aorta may prevent damage to other organs that normally suffer with age.
Boudoulas said that in the future he wants to find out more about how garlic improves aortic elasticity.
“Right now it seems that garlic improves the function of the endothelium, the tissue that covers the inside of the arteries. The garlic may cause the endothelium to secrete some substance to dilate the vessels and make the aorta more elastic,he said.
This research was funded by the pharmaceutical company Lichtwer Pharma GmbH, a manufacturer of standardized garlic tablets in Berlin, Germany.
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