In the presence of male twins in the woman's chances of having children drops considerably. These conclusions were British scientists have analyzed the family history of twins. Check out supermodel for additional information. To study used data collected between 1734 and 1888 years. This period was chosen deliberately: scholars interested in the statistics is not affected by modern methods of treating infertility. As researchers found, the presence of twin brothers linked to 25% increased risk of infertility in comparison with same-sex pairs of twins, girls. Identified patterns are also explained by the less chances for marriage: Mothers with twin brothers, married to 15% less.

But scientists believe an increased risk of Infertility is also associated with the harmful effects of the hormone testosterone in the body of female embryos. Scientists say the effect of testosterone brother, who can penetrate into the female fetus through the placenta, can lead to the formation of disadvantageous from the standpoint of sexual selection masculine appearance, and to increase the likelihood of influencing the likelihood of infertility diseases of the female reproductive system. According to experts on Infertility last hypothesis is also confirmed by the results of experiments on animals. For example, in sheep hormone testosterone exposure in utero led to polycystic ovaries – a rather common cause of infertility in humans.

Polyunsaturated fatty acids are divided into two groups – a family of polyunsaturated fatty acids omega-6 (linoleic and gamma-linolenic fatty acids) and Omega-3 (alpha-linolenic, eicosapentaenoic, docosahexaenoic fatty acids). The main sources of omega-6 fatty acids are sunflower, corn, soybean and cottonseed oil (60-80% PUFAs). Sources of Omega-3 fatty acids are flax, camelina and soy oil and fish oils (60-90% PUFAs). Unique in its properties is mare's milk, which contains fatty acids like Omega-3 and Omega-6. Mare's milk markedly initiate immunity, both antibodies (specific protection against viruses and bacteria) and non-specific factors that provide protection against the penetration into the body of infections. Mare's milk and mare's milk is traditionally used as a treatment for tuberculosis, but only in the 21 th century, scientists discovered the secret of this tool. We must remember that all must be respected balance.

Surplus of one or another type of pufa as unacceptable as the shortage. The correct ratio of pufa family of omega-6 to omega-3 is important for providing the desired level of immunity, prevention atherosclerosis and hypertension. The optimal ratio is 5:1 to 10:1. If the body lacks pufa may cause a number of unfavorable changes associated primarily with metabolic disorders fats have adverse effects on other types of metabolism (protein, water and salt, phosphorus-calcium). As a result of these disorders in children can form disorders of the nervous system. They lag behind in physical and neuro-psychological development, there are persistent, hard to treat allergic skin diseases. In adults, the lack of pufa leads to the development of hypertension, atherosclerosis, obesity, diabetes during acute diabetes, immunodeficiency develops.

The top layer of skin, the epidermis, normally consists of basal proliferating cells and 5-6 layers of epidermal cells, which are 'moving' to the skin surface, are gradually losing their 'cell shape' and reborn as keratin keratinized plate, then peel and disconnected from the skin surface. Basal layer of the epidermis plays another important role. It defines our tan. It is the pigment melanin, which depends on the number and color. Than produce more melanin, the more intense and darker color of skin Pigment cells on the skin surface evenly distributed. In the area of the face on each square centimeter has twice as many melanophores than in inside of the arm.

Therefore, a person tans much faster and stronger. Below is the dermis, which contains muscles, small blood vessels supplying blood, the basal cell layer of the epidermis, and a framework of collagen fibers and elastin. The main content of the dermis – the gel substance, the main component of which – hyaluronic acid. She fills the space between the fiber bundles of connective tissue cells and blood vessels. Aging skin depends on several factors. Development of the epidermal cells at the age of 25-35 basal cells slow the rate of division, because of this, the number of layers of dead cells increases. This is due to a gradual decrease the concentration of various hormones in the blood. However, the intensity of this process can be sustained with exfoliation with fruit acids, or microdermabrasion. This removes the upper layers of keratinized cells, with exposing the lower lying, younger layers.