If you're a heavy coffee drinker, you can start cutting down by mixing decaffeinated coffee in with your regular coffee. Then after a week switch to drinking half decaf and half regular. Then switch to drinking only decaffeinated coffee. Another Tip is to wait as long as you can before having your first cup of coffee each day and experiment with teas or other drinks that contain less caffeine. The bottom line is to be sensible.
Caffeine is a stimulant and it does have effects.
And, if you stop taking it, it has effects. Don't abuse it, and if you're going to cut down, do so gradually. Movie popcorn is no low-fat treat. Try a baked pretzel instead. Stay away from Godzilla-size confections.