Stigler diet - an early rigorous approach to nutrition

There's been a huge amount of discussion here about "Soylent", be that a company, a project, or whatever.

https://www.hnsearch.com/search#request/all&q=title%3Aso...

What I'm a little confused about is why people aren't doing this "properly", in the sense that the problem was formulated by Stigler over half a century ago, and George Dantzig produced the algorithm to solve a large, complex version of it over 30 years ago.

If you're really interested in producing an adequate diet for minimal price, why not actually use the work done decades ago?