Will Prescribing Vegetables Reduce Health Costs?

Recently, Tufts University published a research paper that looked at the effect of price incentives on health cost savings. (Paper: here).

This was brought to my attention via a new headline that read:

"“Prescribing” fruits and veggies would save $100 billion in medical costs" 

-Fast Company January 2021: LINK

$100 billion sure seems like a lot! And these are the kinds of statements that get my inner actuary all fired up.  Where did this number come from?  I will unpack this bit by bit (or maybe bite by bite?) and please allow me a few rants.