My mum says my skin is going yuck because im eating too many fatty food. is this true?
No. Actually acne can be a side effect of prednisone which I know you were on recently. Your mum is scared and she loves you. She sees you in pain and just wants you to be OK. She may also be slightly in denial and hoping for a simple solution of a nice tidy medicine from a nice friendly doctor to fix you right up. It's not that easy or all AS patients would be doing that.
The problem she is overlooking is that most of the drugs offered do more harm than good in the long run. The diet seems a safer option to me than the rather scary list of side effects that come with long term drug use. Just google the side effects of methotextrate, prednisone, sulphasalzine etc and you will see what I mean.
Yes, you may lose some weight but the hard core drugs can do a lot worse for some people. Just have a look on the main support board here and read the number of people on all manner of meds and STILL in pain every single day and getting worse every year! How is that a better option than the NSD? For some people they have no choice and for various reasons cannot or will not do the diet. But you have a choice and it seems the diet DOES work for you.
The "professionals" don't believe in it because they have no knowledge of it. They can't go recommending something they know nothing about. They have no dietary training unfortunately. Their forte is medicines and so that is what they offer...and fair enough.
I'm sorry Seb, I hope you can find a way to get thru to your Mum.