I was getting these quite a bit during stage 2-3ish. I too though it must have been diet related. Apparently not.
Foam rolling and stretching before and after made the spasms stop. For me it was my calves that are particularly tight. Hydration and caffeine also seem to maybe contribute as well.
I've found what Leigh said about imbalances to be true for me. I was doing none of what she recommends when my troubles began - cramps, weird knees pains and now patellar tendinitis and what I saw referred to as "gluteal amnesia."
