Is our mean body temperature decreasing and why? What can we learn from it?
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[1]https://www.sciencedaily.com/releases/2020/10/201028171432.htm
[2]https://en.wikipedia.org/wiki/Human_body_temperature
[3]https://advances.sciencemag.org/content/6/44/eabc6599
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Problems with Carl Wunderlich's temperature measurements
[1]Mackowiak PA, Wasserman SS, Levine MM. A Critical Appraisal of 98.6°F, the Upper Limit of the Normal Body Temperature, and Other Legacies of Carl Reinhold August Wunderlich. JAMA. 1992;268(12):1578–1580. doi:10.1001/jama.1992.03490120092034 https://jamanetwork.com/journals/jama/article-abstract/400116

Not global warming
[1]https://www.jci.org/articles/view/135006
[2]https://theconversation.com/how-rising-temperatures-affect-our-health-123016

I don't think its population getting older
[1]https://ourworldindata.org/grapher/age-dependency-breakdown
[2]https://ourworldindata.org/world-population-growth
[3]https://www.prb.org/2020-world-population-data-sheet/#:~:text=The%20world%20population%20is%20projected,as%20in%20the%20United%20States.
Maybe the hypothalamus?
[1][1] D. Grimaldi et al., “Evidence of a diurnal thermogenic handicap in obesity,” Chronobiol. Int., 2015.
[2][1] F. Bastardot, P. Marques-Vidal, and P. Vollenweider, “Association of body temperature with obesity. The CoLaus study,” Int. J. Obes., 2019.
Progressive increase in global iron deficiency

[1]https://www.who.int/vmnis/anaemia/prevalence/summary/anaemia_data_status_t2/en/
[2]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5112924/
[3]https://www.nature.com/articles/pr19871174.pdf?origin=ppub
[4]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6531837/

A bit of everything
Other environmental factors (if not global warming)


How about prostaglandins and IUD?
[1] "Eicosanoid Synthesis and Metabolism: Prostaglandins, Thromboxanes, Leukotrienes, Lipoxins". themedicalbiochemistrypage.org. Retrieved 2018-09-21.
[2] Mary Anne Koda-Kimble (2007). Handbook of Applied Therapeutics (8th ed.). Lippincott Williams & Wilkins. p. 1104. ISBN 9780781790260.
Reduced number of infections or physical activity
[1]https://jamanetwork.com/journals/jama/fullarticle/768249
Ambient temperature in the clinic might explain the differences in the average body temperature
[1]Mackowiak PA, Wasserman SS, Levine MM. A Critical Appraisal of 98.6°F, the Upper Limit of the Normal Body Temperature, and Other Legacies of Carl Reinhold August Wunderlich. JAMA. 1992;268(12):1578–1580. doi:10.1001/jama.1992.03490120092034 https://jamanetwork.com/journals/jama/article-abstract/400116
Measurements were taken in different climate zones



Great for the lifespan
[1] Conti, B.; Sanchez-Alavez, M.; Winsky-Sommerer, R.; Morale, M. C.; Lucero, J.; Brownell, S.; Fabre, V.; Huitron-Resendiz, S.; Henriksen, S.; Zorrilla, E. P.; De Lecea, L.; Bartfai, T. (2006). "Transgenic Mice with a Reduced Core Body Temperature Have an Increased Life Span". Science. 314 (5800): 825–828.
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