How much sun to take on vacation

In order to have healthy bones It is recommended to consume calcium and phosphorus sources, such as dairy products, and a exposition of 10 to 15 minutes to direct sunlight, for its photosensitizing effect. Any exposure that exceeds this has no biological justification.

The "badges" and the rosy color that forms when I expose myself to the sun is due to the Blood flow that tries to compensate for the moisture that is being lost by dehydration When it is not possible to recover it becomes a "dead zone" with the consequent beginning of the corresponding wrinkle. Dehydration is an immediate effect and when it is severe it can be converted into burn . The long-term effects are due to an invisible component, radiations.

The ultraviolet radiation (UV), as a result of exposure to the sun, has "memory", and remember all the occasions that you sunned yourself in excess, during your whole life. This forces us to talk about probabilities, the more times you expose yourself and the longer you do it, higher is the probability of having a hurt .

Although there are 6 different forms, most of the ultraviolet radiation that reaches the Earth does so in the forms UV-C, UV-B and UV-A; The first two, which are the most harmful, almost do not affect because they are absorbed by oxygen and ozone in the atmosphere. The earlier and later it is, the radiations have to pass through more atmosphere, and therefore are less harmful. This means that during the period of 12:00 and 16:00 hours the sun's rays are more dangerous . If we add the thinning of the ozone layer and even the formation of holes that change place on the earth's surface, expose the sun too much in the critical schedules , significantly increases the probability of present irreparable damage (from irritation, loss of elasticity or can also trigger systemic lupus erythematosus).

UV radiation is highly mutagenic , that is, that induces mutations (skin cancer). In DNA, it causes damage by forming pyrimidine dimers (usually thymine dimers) that shorten the normal distance of the bond, generating a deformation of the chain.

The more exposure to the sun, the greater the probability of presenting mutations and the greater number of these. People with the darker skin they can endure more time in the sun , which is an additional problem since they are exposed to a greater amount of radiation. On the other hand, people with clear skin support less, but due to the lack of melanin in the skin, the level of protection is lower and they tend to present greater damage due to the formation of wrinkles at younger ages. A consequence of overexposure to the sun is the cloth and the appearance of moles, which can turn into cancer. It is recommended that the population stay in the shade, wear blouses or shirts with long sleeves and light colors, go out with cap or hat , use sunblock (FPS) of 50 , to prevent burns, as well as drinking water continuously to avoid dehydration.

The organ that receives more radiation is the eye and will be unprotected if lenses are not used with lenses designed to filter out ultraviolet radiation timely and properly.

You decide when, how, how, you will be exposed to the sun with your due precautions.

Dr. Francisco Quintanilla Guerrero . Coordinator of the Bachelor's Degree in Pharmaceutical Chemistry Biotechnology.

UVM Campus Querétaro.

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