The cost of eating a WFPB diet

I volunteer and serve on the task force for my local soup kitchen. I also lead the Internet effort. I came across this video by Jeff Novick in an ad for his Fast Food DVD. He has calculated here that the whole food, plant-based meals he makes in the DVD cost about $4 per person per day or less. Extremely healthy food, extremely inexpensively.

uploaded February 11, 2011 (4:11)
So I got to thinking. Wouldn't it be possible to introduce a whole food, plant-based diet to those extremely economically disadvantaged who face health challenges and see what happens? So I looked around and saw that Earthsave did it with the Sacremento Food Bank in 2011. This was the video they put up to raise funds for the project in March 2011. It describes who is going to be involved. These were some of the results, the video uploaded in November of 2011.
I am new to all this. I know the terrible challenges of hunger in New York City with a population greater than Dallas (1.4 million New Yorkers) relying on soup kitchens and pantries and a population greater than Chicago (2.9 million New Yorkers) experiencing difficulty affording food.
I am going to investigate this further. Surely someone has connected the dots if they are there to be connected? But I don't know because I don't have the expertise to know for sure. Perhaps somebody else does.