What you eat can influence your gene expression.
A post titled Eat Your Grains says:
RNA from our food can survive digestion, sneak into our cells, and control our genes
Researchers studied MicroRNAs from rice that affect cholesterol levels in mice. The effect appears harmful, which is a kind of defense against predation I’d expect from something that hasn’t evolved to cooperate with animals. (Grains have probably evolved some traits that help humans, but only where farmers have long been aware of the traits). Oddly, the researchers say “miRNAs may serve as a novel essential nutrient”, but I expect them to be harmful on average, except in fruits (which have evolved to attract animals).