We examined whether brown adipose tissue density (BAT-d), estimated by the total hemoglobin concentration in the supraclavicular region ([total-Hb]sup), and the season of conception, classified into warmer (SW) and colder (SC) seasons, were linked to body mass index (BMI) in adult humans (108 men and 178 women). BMI was significantly higher in low BAT-d participants than in their high BAT-d counterparts, but was not significantly different between SC and SW subjects. BAT-d was significantly higher in SC subjects than in SW subjects. In conclusion, the level of BAT-d is related to the season of conception and BMI in adult humans.
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