There will likely be a reconditioning of the biologic and genetic makeup of humans and animals. There are broken genes in humans and animals that could contribute to nutrition if they were functional.
http://en.wikipedia.org/wiki/Pseudogene
Pseudogenes are dysfunctional relatives of known genes that have lost their protein-coding ability or are otherwise no longer expressed in the cell. Although some do not have introns or promoters (these pseudogenes are copied from mRNA and incorporated into the chromosome and are called processed pseudogenes), most have some gene-like features (such as promoters, CpG islands, and splice sites), they are nonetheless considered nonfunctional, due to their lack of protein-coding ability resulting from various genetic disablements (stop codons, frameshifts, or a lack of transcription) or their inability to encode RNA (such as with rRNA pseudogenes). Thus the term, coined in 1977 by Jacq, et al., is composed of the prefix pseudo, which means false, and the root gene, which is the central unit of molecular genetics.
The L-gulano-γ-lactone oxidase gene, the gene required for Vitamin C synthesis, was found in humans and guinea pigs. It exists as a pseudogene, present but incapable of functioning. In fact, since this was originally written the vitamin C pseudogene has been found in other primates.