Caffeine Effects: Withdrawal, Sleep & Health Impact

Caffeine impacts everything from sleep quality to concentration and heart rate. Learn how long withdrawal takes, the diuretic effects on the body, and the potential risks of taking caffeine tablets with medication or alcohol.

How Much Caffeine Is In Tim Hortons Coffee?

Published Jul,08 2011 | By Graham Ulmer

Caffeine is a mild stimulant that sparks the body's natural "fight or flight" response. Caffeine causes the adrenal gland to secrete fluid, which is why you feel a sudden rush after drinking a cup of coffee.