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Winter sex is more likely to produce weak individuals who never have to worry about their weight, according to a study cited Monday by the Press Association. On the other hand, children designed during the summer must make every effort to keep their lives alive.
Scientists have associated the cold season concept with an increased amount of brown fat that burns calories in both mice. as well as people. In adults, only small amounts of brown fat, especially under the tongue, are around the clavicle and along the spine. But people who have more of this precious fabric can be considered lucky. Unlike white fat, which promotes heart disease, cancer and diabetes, brown is generally considered beneficial. It burns calories, generates heat and reduces the risk of overweight or metabolic disorders.
Swiss scientists have computerized tomograms for 8,400 adults, comparing those designed in a cooler year, and born between July and November with those born between January and June. They found that the first group had brown fat much more active than the second. Tests on mice encouraged to mate at warmer or lower temperatures confirmed the results and showed that the difference in temperature affects only sexually active males
Cubs of male mice kept at 8 degrees Celsius during several days before mating, they have a greater amount of brown fat. They were also more protected against weight gain and metabolic disorders when they were getting a high fat diet. Previous studies have suggested that people living in the coldest regions of the world tend to have higher levels of brown fat.
"Until now, the assumption was that this had to do with the temperatures that people faced during but our observations suggest that pre-design temperatures could also affect subsequent levels of fat Brown, "said Professor Christian Wolfrum of ETH Zurich University.
However, further research is needed before couples to receive advice based on this study, scientists say. Study, published in the journal Nature Medicine, showed that temperature affects the chemical changes in sperm DNA that can be inherited, a process known as "epigenetic programming."
"We must to study more closely the correlations. But it is likely that exposure to a colder temperature will have to last longer to have an effect on epigenetic programming. A dip of cold water or a short period of time on an ice block will probably not not enough "Professor Wolfrum added.
He drew attention to the fact that average temperatures in the United States have increased in recent decades.Studies have also shown that the temperatures that people have to do in their place of residence are related to their weight. "Our research highlights a possible mechanism for this," said the professor.The team is planning a new study to compare the epigenetic sequencing of human sperm in summer and winter
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