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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Caffeine's Effect on Blood Pressure Vlachopoulos and colleagues tested the effects of caffeine on the major arteries of 10 people who were being treated for high blood pressure and were an Coffee and blood pressure In the meantime, it suggests that the effect of drinking 8 cups of coffee a day (75 mg caffeine per cup) on people with normal blood pressure is small. || DukeMedNews || Caffeine's Effects are Long-Lasting and Compound The study also showed that while caffeine increases blood pressure and heart rate, it also amplifies those effects at the times when participants report Coffee At Work Equals High Blood Pressure "Over many years, this increase in blood pressure may heighten your risk of suffering a "You can measure how caffeine affects people in the laboratory, Effects of caffeine on blood pressure, heart rate, and forearm Systolic blood pressure and MAP were also higher during exercise plus caffeine; however, these increases were secondary to the effects of caffeine on Caffeine Effects on the Heart, and Heart Disease The effects of caffeine on ambulatory blood pressure, heart rate, and mood in coffee drinkers. Journal of Behavioral Medicine. 19(2):111-28. Caffeine and Blood Pressure: Keeping a Finger on the Pulse of For regular consumers, caffeine has no effect on blood pressure. People who do not consume caffeine regularly may experience a short-term increase in blood Hypertension Risk Status and Effect of Caffeine on Blood Pressure Abstractâ”We compared the acute effects of caffeine on arterial blood pressure (BP) in 5 hypertension risk groups composed of a total of 182 men. Go Ask Alice!: Does caffeine raise blood pressure? Some folks develop a tolerance to caffeine, and it no longer has this effect. There is no evidence that caffeine causes high blood pressure, also known as BBC NEWS | Health | Caffeine 'does not raise blood pressure' Dr Simon Thom of St Mary's Hospital in London said coffee had a small effect on blood pressure compared to other foods like salt. Caffeine: How does it affect blood pressure? - MayoClinic.com Exactly what causes this spike in blood pressure is uncertain. Some researchers suggest that caffeine narrows blood vessels by blocking the effects of |
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