I have found both times on WW that the bill initially went up, but then tended to drop. I put this down to the “once offs” in the first week; purchasing the oil sprayand lots of canned stuff (which we normally don’t get).
Like the Nod, we’ve found that we are spending more on fruit and veg (often up to $70 a week at the market!!!) but weigh less (pun intended) on stuff like chocolate, chippies, and, well, choclate chip cookies! As well as meat, etc.
We do the whole week’s shopping in one hit, and, overall, it tends to be a bit cheaper when we are on WW than when we are not.
This time around, the amount of money we are spending has been distorted by baby stuff…