My Unexpected Questions After Starting the Sapropterin Trial

Starting the Sapropterin (BH4) trial has brought up some questions and challenges that I hadn’t expected. I embarked on this journey with a low expectation, as I am borderline classic PKU, so I knew my chances were slimmer than others.
My levels hadn’t been below 1000 umol (micromoles per litre is the unit used to measure Phenylalanine (Phe), in the blood) for years now. I had previously been content with being consistent, despite my levels being much too high. The first stage of the trial is to get a baseline. This is done by getting your Phe readings at a stable level, it is then used as a benchmark to evaluate the results of Sapropterin. I began my baseline by focusing on getting my levels down, to 600 umol, (the optimal window being 400 – 600 umol).
Starting on the strictest diet I had done for many years, my levels very quickly dropped to 600, and then further still into the low 500s. Having managed to drop them by over 600 umol the change in how I was feeling was incredible. I had switched from my standard, more negative mindset, into one of pure positivity. I can’t remember when I last felt this alert, or alive. I was feeling so hungry, not for food, but for life.
If I ever contemplated having more protein available in a day, my mind goes straight to being able to eat high protein foods. I don’t know if this is because I spent so much time off the diet in the past, or if this is just the natural response to the idea of having more exchanges (grams of protein). In reality though, this thought isn’t very realistic, because even if I doubled my daily intake of protein, having PKU would still mean high protein foods would be off the table! This left me pondering as to what I would be able to do with my extra allowance, if indeed I were to be a responder to the treatment?
If you told me 10 years ago how challenging this question would’ve been, If I was ever fortunate enough to need to answer it, I would never have believed you.
When I opened that first message on the MyChart App and saw my results and my levels had hit 325 umol, and only after my first week of taking Sapropterin, I was speechless; I had to pinch myself. Reading the message that followed the result to see my exchanges had been increased by 2, was nothing short of joyful! I was amazed at how quick this had all happened.
My choice on how to use the extra 2 exchanges for the first time was easy, a pint to celebrate! It was then to my surprise, I was finding myself with spare exchanges at the end of the day. Initially, I used these to have a coffee and a couple of biscuits in the evening. I was finding this challenging because I didn’t want to have to increase my portion sizes, but I was struggling to find new things that would naturally take my newfound increase in protein, without having to eat more food.
As I have talked about before, I have struggled previously with an overeating disorder, which has been under control for a while now. Starting this trial had given me the bonus of losing two and a half stone in the three months since strictly returning to the diet for the baseline. I am very eager to not go backwards and put it all back on again.
My amazing wife Donna suggested I make a list of the amber protein foods from the PKU traffic light system (rather than spending my time ogling all the red ones!). And it made total sense to me that those should be my initial focus of investigating new options. I started this straight away by introducing peas and sweetcorn into my meals. A simple and easy fix for the extra 2 exchanges, and far healthier than the biscuits I was consuming in the evenings.
Within a week I was being increased again, by another 2 exchanges. This allowed me to introduce a small amount of bread into my diet, after discovering a whole French stick from Asda is 20 exchanges. Armed with a bread knife and several sandwich bags I equally divided it up into 4 pieces. Putting 3 in the freezer, I then loaded the remaining one up with Violife cheese, salad and a drizzle of sweet chilli sauce for lunch that day. That was quite the treat. I also managed a single slice of bread toasted one day that week. The thought of maybe not needing to bake loaves of bread every week, seemed like a lottery win on the horizon. It was hard not to start getting excited now!
My focus has really changed from wanting/being able to eat high protein foods (which would obviously be a dream fulfilled), to making the diet less work and less reliant on prescription foods.
I’m now totally focused on how Sapropterin can make my life easier. Being able to cook and eat more in tune with the rest of my family would be life changing and so much simpler. What could be better than removing the need to cook different meals, stopping the struggle to make food to take out and removing the need to batch cook in the same way, if at all.
Three weeks after I started the trial and I am now on 6 exchanges more than before I started this trial. This has opened the door further; If I am blessed enough that my exchanges increase further, I will start looking at the possibility of adding rice into my diet.
Despite my excitement over responding, I am fully aware that some of our community members will not be responders and I can’t imagine how disappointing that must be. But please, if this is you there is still hope for the future. There are more treatments in the pipeline, with better results than Sapropterin and with much higher response rates.
If you would like to share your experiences, whether relevant to Sapropterin or not, please leave a comment below. I always encourage you to share your stories with me. Your stories motivate me to keep writing this blog and pushing to raise awareness, wherever you live in this world of ours.
Take care of yourself.
Dan
Enjoy this post?
Read next ‘What is PKU’































