It appears that there are several scientists studing the way foods interact wich each individual genes. It's somehow a new science that is beggining:
nutrigenomic . Maybe one day we all will have ways to test exactly what we can eat and cannot eat.
Check this sites:
http://www.healthtech.com/newsarticles/issue56.asp Nutritional genomics nutraingredients There is going to happen a international conference on this subject in Auckland, New Zealand:
International Conference of Nutrigenomics Are there any ASers there who want to go?
If you want to learn more, there is plenty of information on the net about this subject.
Zélia