@Kilgore said in 6+ cups of coffee a day cuts suicide risk by 80%.:
@Ecstatic_Hamster said in 6+ cups of coffee a day cuts suicide risk by 80%.:
I can drink only about 3 cups of very strong coffee daily. After that it starts affecting my sleep quality.
I have read that if coffee impacts your sleep quality it is a sign of a glycogen depleted liver.
Not sure about this. I can easily sleep with coffee, no problem. But sleep quality seems universally affected.
https://www.sciencedirect.com/science/article/abs/pii/S1389945702000151
Methods: In the first part of the study, six volunteers drank either decaffeinated or regular coffee in a double-blind fashion on one day, and the alternate beverage 7 days later. Sleep parameters were assessed by actigraphy. In the second part of the study, the subjects again drank either decaffeinated or regular coffee, and they then collected urine every 3 h for quantitation of 6-sulphoxymelatonin (6-SMT), the main metabolite of melatonin in the urine.
Results: We found that drinking regular caffeinated coffee, compared to decaffeinated coffee, caused a decrease in the total amount of sleep and quality of sleep, and an increase in the length of time of sleep induction. Caffeinated coffee caused a decrease in 6-SMT excretion throughout the following night.
Conclusions: The results of our study confirm the widely held belief that coffee consumption interferes with sleep quantity and quality. In addition, we found that the consumption of caffeine decreases 6-SMT excretion. Individuals who suffer from sleep abnormalities should avoid caffeinated coffee during the evening hours.
Also habitual coffee drinking shrinks pineal gland over lifetime
https://academic.oup.com/sleep/article-abstract/41/10/zsy127/5053876?redirectedFrom=fulltext
We found that smaller VPP was associated with higher cumulative lifetime coffee consumption. Participants who consumed more than 60 cup-years of coffee had VPPs that were smaller by about 20% than individuals who consumed less than 60 cup-years of coffee. The VPP mediated the association between lifetime coffee consumption and sleep efficiency and quality.
Conclusions
Our findings suggest that high lifetime coffee consumption may reduce VPP, and that this reduction in VPP may impair the quality of sleep in late life.