From Minecraft Wiki
The icon for the Saturation effect.

Saturation is a Status Effect found in Minecraft that was added in 1.6. This status effect works in a similar way to Regeneration, except that it affects the hunger bar instead of the health bar. For every level, it restores (File:Half Shank.png) per tick, which amounts to the full hunger bar per second on level 1.

Like all status effects, it can be removed by drinking Milk.

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