Coffee is a potent diuretic.
The stimulant effect of coffee can act as a slight diuretic, however the overall volume of water you consume while enjoying your cup of coffee will more than make up for the small amount lost in your urine.
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Caffeine has no health benefits
Caffeine adversely affects the health of children
Caffeine causes cancer
Caffeine increases the risk of heart disease
Caffeine is a risk factor for osteoporosis