Deus Ex: Human Revolution/Gameplay

Play-style
Deus ex can be played aggressively, stealthy or both. Upgrades called augmentations that support different play styles can be very useful in certain areas of the game. This guide will assist you in choosing the appropriate augmentation for your play style.

Health and Energy
No matter the difficulty you play on, Adam can take very little damage. He's also extremely sensitive to fall damage. Health regenerates, but energy doesn't.

Energy is what allows take-downs, invisibility, picking up large objects, breaking walls, etc. It regenerates naturally but can take a long time. Eating food or drinking will give you one or more bars of energy.