Some activities take longer to perform and can be dangerous in the middle of a gunfight. Fortunately, most animations can be interrupted to quickly ready yourself for an incoming enemy.
To stop an eating or healing animation, press the right mouse button while the animation is playing. The effect will not be applied, and no charge will be consumed.
To stop a weapon, magazine, or chamber check animation, press the right mouse button while the animation is playing. The animation will be interrupted immediately.
To stop a long reload animation (for weapons with an integrated magazine, such as shotguns), press the left mouse button while the animation is playing. The reload will be interrupted after the current round is loaded, and your character will return to a ready-to-fire state.