What is Cholesterol?

Cholesterol is a sterol (a combination steroid and alcohol). Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Because cholesterol is synthesized by all eukaryotes, trace amounts of cholesterol are also found in membranes of plants and fungi.The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol in solid form in gallstones by Francois Poulletier de la Salle in 1769. However, it is only in 1815 that chemist Eugene Chevreul named the compound "cholesterine".[2]Most of the cholesterol is synthesized by the body and some has dietary origin. Cholesterol is more abundant in tissues which either synthesize more or have more abundant densely-packed membranes, for example, the liver, spinal cord and brain. It plays a central role in many biochemical processes, such as the composition of cell membranes and the synthesis of steroid hormones. Cholesterol is insoluble in blood, but is transported in the circulatory system bound to one of the varieties of lipoprotein, spherical particles which have an exterior composed mainly of water-soluble proteins. The main types, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) carry cholesterol from and to the liver.According to the lipid hypothesis, abnormally high cholesterol levels (hypercholesterolemia) and abnormal proportions of LDL and HDL are associated with cardiovascular disease by promoting atheroma development in arteries (atherosclerosis). This disease process leads to myocardial infarction (heart attack), stroke and peripheral vascular disease. As high LDL contributes to this process, it is termed "bad cholesterol", while high levels of HDL ("good cholesterol") offer a degree of protection. The balance can be redressed with exercise, a healthy diet, and sometimes medication.

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Cocoa Lowers Blood Pressure, Tea Does Not - Associated Content
Background Epidemiological evidence suggests blood pressureâ“lowering effects of cocoa and tea. We undertook a meta-analysis of randomized controlled trials

Arch Intern Med -- Abstract: Effect of Cocoa and Tea Intake on
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Cocoa, But Not Tea, May Lower Blood Pressure
In a pooled study, roughly 100 g of flavonol-rich chocolate reduced systolic and diastolic blood pressure by amounts comparable to beta-blocker or

Cocoa, but Not Tea, Lowers Blood Pressure
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The Joint National Committee on Hypertension has specifically stated that there is no evidence linking coffee/tea and high blood pressure.

The Coffee Blood Pressure Connection - Caffeine and High Blood
Check out Cocoa Lowers Blood Pressure, Tea Does Not - Submitted by Griff at Associated Content.

Blood Pressure Herbal Tea - 20 Tea Bags
Drinking as little as a half-cup of green or oolong tea per day may lower the risk of high blood pressure by nearly 50%.

Tea Drinkers Reap Blood Pressure Benefits
Researchers compared the blood pressure-lowering effects of cocoa and tea in previously published studies and found eating cocoa-rich foods was associated

Chocolate Lowers Blood Pressure
However, some concern has been raised that drinking tea may increase blood pressure. Keeping blood pressure under control is critical to preventing heart

Does Drinking Black Tea Increase Blood Pressure?
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The health benefits of tea and coffee. The effects on blood pressure are most likely when caffeine is taken in excessive quantities or by highly

BBC - Health - Healthy living - Caffeinated drinks
Tea keeps blood pressure down Tea drinkers are less likely to suffer from hypertension, report Chinese researchers in a study out this week. Tea drinkers.

Tea keeps blood pressure down
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Controlling Blood Pressure Works · Does tea offset the effects of caffeine on blood pressure? Aspirin is ineffective in preventing heart disease when the

What is blood pressure?
A German study suggests there is evidence that cocoa but not tea is linked to blood pressure reduction.The study is published in the American Medical

Cocoa But Not Tea Linked To Blood Pressure Reduction
Foods rich in cocoa appear to reduce blood pressure but drinking tea may not, according to an analysis of previously published research.


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