Season of conception may influence how your body stores fat
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New research published in the journal Nature Metabolism suggests that the month in which you were conceived could have a lasting impact on your body fat levels later in life. Researchers found that people conceived during colder months tend to store fat differently than those conceived in warmer months. Specifically, those conceived in colder seasons may have a lower body mass index (BMI) and reduced fat around internal organs. This may be linked to brown adipose tissue, a type of fat that generates heat and helps regulate body temperature, especially in cold environments and in newborns.
Source
Yoneshiro, T., Matsushita, M., Fuse-Hamaoka, S. et al. Pre-fertilization-origin preservation of brown fat-mediated energy expenditure in humans. Nat Metab 7, 778–791 (2025). https://doi.org/10.1038/s42255-025-01249-2
Additional Reading
https://www.sciencealert.com/your-body-fat-may-be-shaped-by-the-month-you-were-conceived
https://www.independent.co.uk/news/science/bmi-lower-body-fat-birthday-month-b2731582.html