Decaf coffee won’t cause dehydration, although it should not be your main source of hydration.Click to see full answer. Likewise, does decaf coffee count as water intake?True or false: Coffee and tea count toward hydration. So even caffeinated beverages such as coffee and tea have a net hydrating effect. Sure, plain water and decaf beverages will hydrate you more, but you can still count that iced coffee as a quencher as much as it is an afternoon pick-me-up.Also Know, does coffee cause dehydration? No, Coffee and Tea Aren’t Actually Dehydrating. But despite what you’ve heard, coffee and caffeinated tea are not dehydrating, experts say. It’s true that caffeine is a mild diuretic, which means that it causes your kidneys to flush extra sodium and water from the body through urine. Thereof, is decaffeinated coffee bad for you? Decaffeinated coffee, or “decaf,” is similar in taste and appearance to regular coffee but contains very little caffeine. There is no evidence to suggest that drinking decaf is bad for a person’s health, and it may even share some of the health benefits of regular coffee.What are the side effects of decaffeinated coffee?Excess caffeine may overwhelm the central nervous system, cause restlessness, anxiety, digestive problems, heart arrhythmia or trouble sleeping in sensitive individuals. People who are very sensitive to caffeine may want to limit their intake of regular coffee, or switch over to decaf or tea.