Sometimes , reading tips to reduce high blood pressure , drinking water is recommended . However, the websites of the authorities as National Heart Lung and Blood and the Mayo Clinic do not mention drinking water, when considering treatment and lifestyle changes for hypertension.
Why some articles indicate that drinking water reduces blood pressure ?
The idea that drinking water will lower blood pressure seems to come from the idea that when large amounts of water used , sodium is removed from the body and thus the pressure drop.
After all, different types of diuretics are very effective in reducing pressure. These diuretics work by increasing the loss of sodium from the body and an increase in urine volume. Thus, the loss of sodium in the blood and reducing blood volume results in a decrease in blood pressure.
Therefore, if drugs that effectively lower blood pressure in most people , work by increasing the amount of urine and the amount of sodium in the urine , then drink more water should do the same thing ?
Unfortunately, there is a problem with this reasoning. To understand why, we must understand that the body handles very well the levels of ions such as sodium and calcium liquid. For optimum performance , the organization has developed a wide range of control processes involved in the maintenance of many ions and fluid levels within a narrow range .
Diuretics act on parts of the system controlling sodium . For example , thiazide diuretics bind to and inhibit a protein called / Cl cotransporter Na (Na = sodium chloride = Cl ), which controls the amount of sodium to be reabsorbed into the blood in the urine is shaped .
The result is that the body gets less sodium in the urine , as they are formed, and therefore more sodium is lost in the urine and there is a slight increase in volume. While diuretics affect the control system and change a part of it.
The water has no impact on the control system of liquid sodium or so will not change the total amount of sodium in the urine, or change the volume of blood. Drink more water to increase the volume of urine and body fluid levels are regulated to maintain steady blood volume.
Moreover, the same amount of sodium (and other ions, etc. ) in a larger volume will be more dilute urine .
Consider the color of the urine. If you have not eaten a lot of liquid , or there was a lot of sweat , there will be a small amount of urine with a yellow box ( urobilin ) . If a person is well hydrated, urine a pale color. The same with sodium. In a healthy individual , the greater the amount of urine due to increased fluid intake , the higher the concentration of sodium .
So the conclusion is that, in general , increasing the amount of water consumed will not increase the amount of sodium in the blood loss , so that the blood pressure is not reduced .
In fact , drinking water can actually cause short-term increases in blood pressure in some people , especially those with some sort of very low blood pressure . This is only temporary and has no long-term impact on blood pressure .
Staying hydrated is good for health, but overhydration no advantage in lowering blood pressure.
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