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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 conceived in the summer may have to make every effort to stay alive. Scientists have linked the concept in the cold season to an increased amount of brown fat that burns calories in mice and humans. 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 being overweight or developing metabolic disorders. Swiss scientists performed 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
. 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 temperature difference only affects sexually active males. Chickens of male mice kept at 8 degrees Celsius for several days before mating have a greater amount of brown fat.
They were also more protected against weight gain and metabolic disorders when they received more 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 experience during their lifetime.But our observations suggest that preconceived temperatures can also affect brown fat levels later on." Professor Christian Wolfrum of ETH Zurich University
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