Demi Moore -- Red Bull Addiction for Years

Demi Moore was obsessively drinking Red Bull in weeks preceding her 911 emergency, but we've learned her addiction to Red Bull is a decade old.

Moore -- a recovering addict -- had cases and cases of Red Bull delivered to her home as early as 2002. Sources connected with Red Bull North America tell us ... Demi was so dependent on the energy drink, the company used her to market the product.

Sources from the Red Bull company tell us ... the delivery schedule was frequent enough to ensure Demi was never without Red Bull.

The Sun published a story today reporting ... in the months before Demi was hospitalized ... she was using Red Bull in place of food.

Our sources say ... two weeks before Demi was hospitalized, she went to a Hollywood party and consumed a massive amount of Red Bull ... but never touched alcohol.