Hungry Lions

There are 25 hungry and extremely smart lions in a cage into which a portion of food is thrown. The following rules, known by the lions as well, apply:

• One portion of food can either fully be eaten by a lion or it can remain untouched, but it cannot be shared between two or more lions.
• If a lion eats the food, he gets satisfied and falls asleep.
• A sleeping lion is considered as one portion of food, just the same portion of food he has eaten. Thus, a sleeping lion can be eaten by another lion (in which case that lion will fall asleep, and so on).
• The lions are hungry, but they are fed properly, so they won't die if they don't eat extra food.
• All the lions like to eat extra food and they don't care if a fellow dies in the process.
• They are smart: a lion will not eat any extra food if it can be known that he would be eaten if he ate it.

Question is: what happens when the extra food is thrown in?