It was nice to find a discussion about this in The Starch Solution. Here, John McDougall states that a plant-based diet averages $4,000 savings per person per year. Or savings of $333 per month. You can read his discussion on pages 203-206 or search for “Food Costs” on your digital device.
For our household (just the two of us) that means saving about $650 per month. That, by the way is about what we currently spend each month. In other words if we started eating animal based products we would double our monthly food costs. Just in case I need another reason to stay on a plant-based diet that would work!
