A power filet is the most powerful of the four health-oriented consumables in the game. Each filet restores 4 hearts of health. For information on the other consumables, see jerky, power jerky, or filet.
How to Obtain
You can only get power filets by either looting them or by crafting them from regular filets. You can also trade for them in a market world.
How to Use
There are a couple ways to consume a power filet. You can hit F to bring up the Power-Ups panel and then click on the power filet icon. You can also put power filets into your hotbar, in which case you need to select it, then click anywhere on the screen to consume it. With the hotbar method, it is possible to consume a power filet even if your health isn't low enough to make use of the full number of hearts it gives.
Note that using the Z key does NOT automatically consume a filet or a power filet. The Z key appears coded only to jerky and power jerky.
Also, as of January 2016, on v3 (the only version for PC users), the F key does NOT yet bring up the Power-Ups panel.