I'm going to pretend to be an appletarian (eating only apple derived foods/drinks) for 3 weeks as a prank causing my friends to have an intervention for me
Why would you prank your friends like this?
I've heard that some people can die of starvation (appletarian) and some people will be forced into a mental ward if they keep eating apples.
That sounds like an interesting prank, but you are still lying to your friends. They don't deserve to worry so much like that and have anxiety over something so fake.
Why do you assume my friends will be overreacting.
Because you're goal is to get them to intervention you, and it would all be for a prank. This is a good way to make your friends not like you, find some other way to have fun with them.