More testosterone and less estradiol in coffee drinkers
People who drink a few cups of coffee a day have more testosterone and less estradiol in their blood than coffee abstainers. Epidemiologists from Harvard University write this in the American Journal of Clinical Nutrition. A noteworthy publication for those who still doubt whether coffee is a superfood.
The researchers used the data of 17,881 women and 8,848 men who were collected within the Nurses' Health Study and the Health Professionals Follow-Up Study.
The researchers looked at the intake of coffee in general, but also separately at coffee with and without caffeine. All these analyses came to the same conclusions. The effects of coffee covered by this piece are therefore independent of the effects of caffeine. They may be the work of the phenols in coffee, such as chlorogenic acid.
The researchers found more testosterone and less estradiol in the blood of the study participants who drank at least 1 cup of coffee daily than in the blood of the study participants who did not drink coffee. Those differences were statistically significant.
The researchers also looked at the 'good fat hormone' adiponectin and the inflammatory factor CRP. In the blood of the study participants who drank 4 cups or more of coffee per day, they found 16.6 percent less CRP and 9.3 percent more adiponectin.
"Our study indicates that coffee consumption is associated with a favorable profile of plasma biomarkers or metabolic [...] pathways," the researchers conclude. "Future prospective and interventional studies are warranted to confirm our findings."
Am J Clin Nutr. 2019 Mar 1;109(3):635-47.
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