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Blond hair is most common in Scandinavia and the Baltic Sea countries, where true blondism is believed to have originated.
Lighter skin is due to a low concentration in pigmentation, thus allowing more sunlight to trigger the production of vitamin D.
In France, according to a source published 1939, blondism is more common in Normandy, and less common in the Pyrenees and the Mediterranean seacoast; 26% of French population has blond or light brown hair.
A 2007 study of French females showed that by then roughly 20% were blonde, although half of these blondes were fully fake.
In this way, high frequencies of light hair in northern latitudes are a result of the light skin adaptation to lower levels of solar radiation, which reduces the prevalence of rickets caused by vitamin D deficiency.
The darker pigmentation at higher latitudes in certain ethnic groups such as the Inuit is explained by a greater proportion of seafood in their diet and by the climate which they live in, because in the polar climate there is more ice or snow on the ground, and this reflects the solar radiation onto the skin, making this environment lack the conditions for the person to have blond, brown or red hair, light skin and blue, grey or green eyes.