Affects of nanotechnology on foods

We have been using nanotechnology to boost the productivity of crops for the last few years to ensure that they grow faster, larger, and last longer.  Most of that technology has been used to in soil in things like fertilizer and growth enhancers.  Now the question is what kind of impact does this have on the animals and humans that feed and eat these foods that were initially affected by the nanotechnology.  To be honest it will probably take researchers years to come up with any real data to analyze the impact.