Hi Daniela,
Welcome to Kickas!
For the most part I am pain free... but I will cheat now and again on the diet and at times will have some stiffness. I cheat with what I call "fringe foods" that cause me a bit of stiffness. Some of those foods are ice cream, eggplant, cheese, pistachios...
I did not need the 3 days of apples to clear me of pain entirely... but I am a big believer that it is of great help, for me personally in assimilation of food (improved digestion).
Couple of items...
1. How many processed foods are you eating? If quite a bit, this is a lot of opportunities for a modified starch of some sort to sneak into diet.
2. Are you taking any supplements? I have taken supplements at times that have caused problems.
3. List out your foods here for us... at times someone is unaware of something that may indeed be somewhat starchy.
Hope you can find some answers to the stiffness and the diet continues to improve.
Tim