Add half a hunger point?

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How would I add half a hunger point to a player when they are in a certain area?
I have got the detection part right I just don't know how to add exactly half a hunger point. Here is what I have tried so far: /execute @p ~ ~ ~ detect ~ ~-1 ~ grass 0 effect @p 23 but I know this is not the best way to do such a thing.
Best Answer
To add half a hunger point, give the player a level 0 saturation for 1 second.
/effect @p minecraft:saturation 1 0
The levels are offset by 1 so that giving a level 0 effect with /effect actually gives the player a level 1 effect.
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How do I give myself more hunger bars in Minecraft?
Peaceful mode is too easy in my opinion. Running around gathering food, making farms, etc is part of minecraft. But anyone who plays on peaceful never experiences this.Do you lose hunger in peaceful mode?
If you own a server with Multiverse (plugin) you can do /mvm set hunger false or back to true if you want to. And everyone in the world will not be affected by hunger!How to Remove Hunger in Minecraft WITHOUT Peaceful Mode
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