Not all recommendations are equally useful
Over the years of development of medicine people have learned many things that help to prevent or effectively counter all kinds of diseases. Wash hands before eating, breathe deeply in stressful situations, to sleep at least eight hours a day, drink plenty of fluids — the list goes on. However, not all advice is equally useful.
Here are the top 7 myths about medicine and health, which it’s time to say goodbye.
Myth 1. Wounds and scratches should be treated with hydrogen peroxide
It is believed that the peroxide disinfects and speeds up healing. In fact, a three percent solution of hydrogen peroxide (H2O2), which is often found in home first aid kits from the standpoint of the treatment of wounds is almost useless.
Evidence that peroxide is effective as a healing agent, scientists have found. With regard to germicidal properties, studies are still being conducted. However, there is evidence that peroxide (as, incidentally, and iodine) antiseptic point of view is not the best choice. The fact that many microorganisms contain enzymes, fast-breaking action of H2O2, therefore reducing the number of bacteria is only temporary.
However, to completely write off the hydrogen peroxide from the accounts is not: it is effective for mechanical cleaning of wounds. About the same as that of pure running water.
Myth 2. A Mantoux test can not be wet
This is one of the most common misconceptions. It is believed that the water that gets on the skin, can affect the reaction of the body, causing a spot of injection will increase in size and give a reason to suspect tuberculosis. But it is not.
The injection of tuberculin is injected into the deeper layers of the skin. To get there, and hence to affect the reaction water can not. That is why the recommendations of the experts, there are no restrictions regarding bathing after the skin test. Physicians are asked only not to RUB or scratch the injection site.
Myth 3. Antiviral drugs protect from cold
Unfortunately, no. Antiviral agents that could prevent or alleviate the course of SARS and the flu, to date, does not exist. The effectiveness of a limited number of drugs is confirmed only in influenza type A. They ease the symptoms and shorten the duration of illness by about a day, which, agree, not so much. However, respiratory infections too tough for them.
In addition, antiviral pills may be unsafe for health, and it is also necessary to take into account.
Myth 4. Have blurry vision from reading in dim light
Eyes reading in the twilight is not really like is the fact. In low light you have to strain your eye muscles and take a closer look into the text. Because of this, the frequency of blinks becomes lower, and mucosa — land. The eyes get tired more quickly. Reading in low light really uncomfortable. But this does not lead to any irreversible consequences to the visual system.
Myth 5. Before training need stretching
If you are going to run the hundred meters faster than Usain Bolt or today to raise a record weight, additionally you should prepare the muscles to extreme loads will not be superfluous rated.
But by and large, the stretching is useless. She does not have a significant effect either on the intensity of pain after exercise or to prevent injuries. And in some cases, if the stretching is too intense, it also impairs muscle strength and training.
All of the above relates solely to the stretching, not warm up before training in General. The preheating of the muscle is still desirable. Only further pull them well, not necessarily.
Myth 6. Fresh fruit contains more nutrients than frozen
Frozen fruit and vegetables have the same beneficial properties as fresh. The reason is that they are frozen immediately after harvesting, when the nutritional value greens are the highest. And some frozen fruits: for example, corn, blueberries and green beans — even better than fresh from the point of view of vitamin content.
In any case, frozen fruits and vegetables more useful than that of “svezhachka”, which lay on the counter or in the pantry at least a day or two: the heat and relative humidity contribute to the loss of nutritional value. For example, green peas lost about half of the vitamin C within 24 to 48 hours after collection.
Myth 7. Foods high in cholesterol harmful
In fact, cholesterol is not harmful, but rather, is vital. It ensures the stability of cell membranes of all living organisms on Earth. And in addition, involved in the production of vitamin D under the action of sunlight, the production of steroid hormones, including cortisol, progesterone, estrogen and testosterone. Popular edition of HuffingtonPost at the time published a long article about how unfairly demonized cholesterol.
Short squeeze (not only articles, but also from other scientific studies): the cholesterol contained in food, is not going to destroy your health and has no slightest effect on the cardiovascular system.
When doctors talk about cholesterol, they do not mean the amount of this substance obtained from food, e.g., chicken eggs. We are talking only about cholesterol circulating in the blood, says the popular American medical resource WebMDThe Dangers of High Cholesterol.
Of violations of cholesterol metabolism in the body — that is the basic evil. And to prevent it, the level of cholesterol in the blood is recommended to control it. This is done not through any dietary restrictions, and preventive methods: through regular blood tests and consultations with a physician watching you.