Make sure your mouth is closed completely.
You can bite slowly, which might sound quieter, though it is really just enlongating the sound.
lifehacks.stackexchange.com/users/2281/Doug Watkins
This trick only really works with chips, and might also be a bit unappetizing.
Put the chip in your mouth, and don't bite it right away.
Let it soften a little from your saliva.
It won't taste quite as crunchy, but it also won't sound so crunchy.
After that, bite more slowly with your mouth fully closed, as Doug said .
lifehacks.stackexchange.com/users/141/Scimonster
Blend it in a blender.
Chips require you to also add some salsa or in general a "wet" component, celery or carrots don't.
Carry it to work in a container of some kind and use a spoon to eat.
lifehacks.stackexchange.com/users/1600/Pieter B
To me, this is more of a manners question, as crunchy foods are meant to be crunched.
So, offer some chips (etc.) to your workmates before snacking.
Explain they are welcome to any and apologize for any 'ravenous munchings' they might overhear from your cube.
Then devour like a Cookie Monster.
They'll find you charming & amusing.
In my cube environ, I used to slowly pour my water from bottle to mug, gradually increasing the distance for volume, then topping it all off with little splooshing sounds.
It's a great (rare occasion) groggy-Friday-afternoon activity that always got some giggles.
Then I'd watch to see who was the first inspired to hit the bathroom.
lifehacks.stackexchange.com/users/14000/user146399
You don't mention if the foods must be raw.
If you can cook them first it will soften foods like carrots and other crunchy vegetables and they will no longer be crunchy.
lifehacks.stackexchange.com/users/18624/SumGuy
For chips, crisps, tortillas and etc, press them against the roof of your mouth using your tongue.
The softness of the tongue will help to suppress the crunch noise.
Then eat normally.
Those foods shapes are specially engineered to do the crunch sound, so that's a quiet way to get rid of the shape first, then eating.
For celery, first slice in pieces.
Place a piece in between your last teeth, empty the air from your mouth, then bite slowly.
Same theory as above, get rid of the crunchy shape.
Just be careful to not bite your cheek.
After the first bite, finish it normally.
lifehacks.stackexchange.com/users/15487/Paulo Amaral
it really works with the chips.
If you are taking it out from a packet then open it wide.
so that you dont mess your hand with the salt.
take single piece and put it completely inside your mouth.
wait..
dont just start biting it.
close your mouth completely and try to make your tongue as close as possible to the lower layer of the chips slice.
then crush it by pressing it upwards with your tongue.
this will make the slice more moist and also the sound produced by biting it with tooth is much higher then that of tongue.
so once it is crushed for the first time.
then you can eat it how ever you want. enjoy munching.......
lifehacks.stackexchange.com/users/15635/Sagar Nayak
I like munching celery at work, but I don't want to annoy my co-workers. Today, I cut my celery into 1-inch (bite-sized) pieces so I don't have to loudly bite it off from the stalk. How else could I eat celery (or carrots or tortilla chips) quietly?
How to eat loud food (chips, celery) quietly
lifehacks.stackexchange.com
<food><sound><snack-food>
lifehacks.stackexchange.com/questions/7178
lifehacks.stackexchange.com/users/4198/BrettFromLA
There are a few things to bear in mind when trying to eat loud foods quietly. You should try to keep your mouth completely closed, bite slowly and try pressing the food against the food of your mouth with your tongue. Alternatively, you could cook them a little first to soften them or simply put them in a blender. The options are to keep your mouth closed and bite slowly, soften chips with saliva in your mouth before biting, put the food in a blender, offer some to your workmates so you can all crunch together or cook the food to soften it.
Keep your mouth closed and bite slowly. With chips allow them to soften in your mouth with saliva before biting. Blend the food in a blender. Offer some to your workmates so you can all crunch together. Crunchy vegetables can be cooked first to soften them. Press chips etc against the roof of your mouth with your tongue for a bit first - eat celery sliced with your back teeth.