Given that even individuals don't have a good understanding of their insulin response to various macronutrients I'm not expecting enough GWAS (genome-wide association studies) data for a person's genetic readout to say much about what they should eat.
That said, an individual can get their *own* data: an understanding of their own insulin-reactivity to those varied macronutrients and how other factors (poor sleep, stress) affect that by wearing a CGM (continuous glucose monitor) for at least a few weeks and logging what they eat. Once people start doing that (and are willing to answer GWAS questionnaires, release their genetic data) we'll *start* to be able to suggest diets based on genetics. But even if you aren't willing to participate at least you'll know what to beware of so it's a win, just not a win for everybody.
I believe both medicare and medicaid are covering the costs of CGMs for diabetes (both types). Anyone know if that's true? If it is, I hope some researcher writes a grant proposal and at least gets some funding for a GWAS there.