A friend of mine (we run cattle together) recently built and opened a vegetable/fruit market in the corner of his highway frontage. He notes some customers come in several times a week to buy one or two tomatoes or potatoes or whatever. He suspects their mindset is that they are buying fresh when in fact they may be buying from the same pile of stuff all week and may as well save the extra trips and buy a weeks worth at a time.

We try to shop weekly with longer intervals being good for non-perishables but typically we do food shopping about once a week.

Pat