I read somewhere that tea has tannin in it, may be coffee does too.
A Diuretic is a chemical that makes you have to go pee. Examples are caffeine and Alcohol.
Yes. Alcohol inhibits anti-diuretic hormone (ADH) release in your brain. ADH aids in water reabsorption in the kidneys, so when ADH release is inhibited by alcohol your body cannot retain as much water so you will urinate more which can lead to dehydration.
Caffeine has two major effects on the human body. One, it acts as a stimulant, ramping up heart rate, dilating blood vessels, etc. Two, it acts as a diuretic, causing the kidneys to put more water into the urine than normal, filling the bladder faster. Caffeine does make you pee more often than if you drank decaf beverages. Try it some time: drink caffeine free alternatives for a day, and see how your bathroom time compares. Excess or just a little bit, caffeine will make you pee.
Directly or indirectly, mostly sympathetic nervous system. The sympathetic nervous system is responsible for the 'flight or flight' response which was first studied by Walter Canon. The role of the sympathetic nervous system is to prepare the body for action, and in the case of caffeine, it makes you more alert, raises your blood pressure, and increases your heart rate.
digitalis
A diuretic. "water pill" makes you pee
Yes, chocolate in large amounts can be a diuretic (makes your stool soft or runny).
Caffeine
It won't stop hunger. Coffee is a diuretic it pulls the water out of your body. The hunger you feel is from the caffeine and hose down lose. Caffeine makes your body burn more energy and the wet lose dehydrates your muscles. Try drinking more water and working out. But from my own experience, no. Coffee fills you up. Your basically drinking a meal. Coffee is a stimulant, it does what is said above.
Caffeine is a stimulant, and therefore makes the processes in you brain work faster.
there is so much sugar in caffeine it makes your blood pump!
makes you hiper