Melatonina, hormonul pe care organismul oamenilor, dar și cel al animalelor îl produce pe timpul nopții, este responsabilă pentru reglarea metabolismului. Studiul arată că utilizarea luminii artificiale în timpul nopții afectează eliberarea acestui hormon, ceea ce are consecințe nefaste asupra sănătății.
Cercetarea a fost realizată folosindu-se datele obținute prin satelit. Astfel, s-a putut vedea în ce țări populația folosește mai des lumina artificială. Cei care auirealizat studiu au luat în calcul și alți factori, precum data nașterii, obiceiurile alimentare și procentul de populație urbană în raport cu cea rurală.
Aceste date au fost comparate cu cele privind nivelul obezității în acele țării și s-a ajuns la concluzia că lumina artificială este un factor important al acestei afecțiuni.
Organizația Mondială a Sănătății arată că aproximativ 1, 9 miliarde de adulți au probleme cu greutatea, iar dintre aceștia 600 de milioane sunt obezi.
Mai mult, spun cercetătorii, suprimarea nivelului de melatonină poate duce la cancer mamar sau cancer de prostată.
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