However, this isnt an excuse to drink sugar laden coffee drinks.But its an excuse to drink black coffee
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Anyway
A summary
Caffeine does a fine job of goading the nervous system into action, resulting in additional fat burning through a complex process called lipolysis (encourages fat cells to release fat into the bloodstream for fuel). It also provides a decent energy boost that spurs performance
Caffeine, which speeds metabolism, is the most-active ingredient in many "diet pills."
Caf breaks down fat, freeing fatty acids which are immediately burned. Conversion of fat to energy is about 30 percent more efficient when caffeine is consumed prior to exercise. Which brings up another caf caveat: The break-down, and the burning, occur only when you're in action!
While the fat is being burned, the glycogen, glucose, and amino acids (blood sugars) are being reserved -- so blood sugar levels remain higher for longer. Low blood sugar = hunger; high glucose staves starving. This is why coffee is popular among students and think-tankers. The brain functions exclusively on glucose, and higher blood sugar levels facilitate thinking.
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http://www.ultimatefatburner.com/natural-weight-loss/guarana.html
http://www.fitwise.com/Benefits_Caffeine.asp