Are you allowed to eat salt and vinegar crips or any other soury stuff while on your period?? PLZ HELP?

honey, you can eat what ever you want when you have your period.
No rules here. No laws against it.

You can eat anything you like during menstruation.

You can eat salt and vinegar crisps at any time. Unless you need to cut down on salt and unhealthy snacks specifically. Go for it!

You are allowed to (there is no law against it), but whether you are on your period or not, it's best not too eat too many crisps.

Of course. you can eat whatever you like.

Of course you can.

It has nothing to do with being allowed to or not. You are expected to know at that age what your parents allow you to eat and what you shouldn't eat, but they can't stop you.
Chetak

You can eat anything you like...

Of course

You can eat whatever you want!