@mustard – yes, the basal changes are hormonal. Mine are a very specific level each month, but not always (or indeed ever) at the same time each month (which are variable in length as well) – 100% for a couple of days, 110% for a couple of weeks, 120% for a few days, 130% for a week, sometimes 140% for a few days (depending on the month’s length – and I’m not talking calendar months, obviously), then back down in fits and starts over about a week to 100%. All timings and lengths totally variable, but not levels. At least they follow the same pattern each cycle, so I can take best guess at when I have to up my basal rate to the next level.
Sugar free pie charts also available