However, this isnt an excuse to drink sugar laden coffee
drinks.But its an excuse to drink black coffee
.
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