Loaded question I know, but this is a really interesting piece on DNA being changed by the foods we eat.
DNA is not being changed, you read it wrong and the title is stupid. Its about miRNAs, very short nucleotide sequences that suppress specific gene. So you may get your DNA expression changed for some short time since miRNAs are degraded by the cell.
The fact that "MicroRNA is also used in the genetic engineering of crops, as a method of RNA interference." has nothing to do with this. To be constantly prohibiting, miRNA gene has to be inserted into the organism's genome which is done via virus or bacterial plasmid.
But the Chinese eat rice with virtually every meal. I eat it >1x per every other week, and even then only a serving's worth. Not enough to make a difference ;)
I think my DNA is already done changed... I grew up eating lots of 'healthy whole grains' and I ate a crappy grain-based diet until just 2 years ago. And low LDL runs in my family, anyway. Mine is in the 80s. I need starch, so. I'm sure any vegetation leaves it's mark - I'm probably just full of spinach (my favorite).
Epigenetics is fascinating, isn't it?