I would answer that in two parts.
One is that when we refer to bringing more food to more people, that's around local agriculture and supporting local producers. It's easier if you shorten the chain to have fresher and healthier food available locally.
I would also posit that in fact it's not necessarily true that you can grow more food for more people using monocultural approaches. In fact, if you look at studies done internationally, in a diverse resource base where you have fuel, fodder, and food being grown in the same place, the yields are actually higher, so there is some analysis to be done around the basic premise that you brought forward.