When you appeal, it's best to gather as much evidence as you possibly can, a letter from your GP is a fantastic start. You could also ask nicely if you could see a specialist in the field of allergies and maybe ask him politely to also write you a letter giving proof. After you've gathered as much ...

Hi guys,

I have seen on here before that people have asked about whether or not they should appeal against their deferral. That is why I have come to ask this. When I was 16 (2010) I applied to the army and was deferred due to not being clear of asthma and an apparent allergy to aspartame, I know ...