I became very interested in the role of epigenetics after listening to a podcast about the emerging field. I found it to be a fascinating expansion of the mechanics of natural selection, albeit one I am not intimately familiar with.
The methylation of DNA to control gene expression has been well established and understood for years but the transmission of methylated DNA was not something researchers had considered. Anyone interested might want to check out the following study just published in Nature: http://www.nature.com/news/2010/101020/full/news.2010.553.html
I have not seen the entire study and it was done using Mice and a "high fat" diet but none the less I suspect there is an indication here that an obese parent could be setting up their progeny for metabolic derangement. In fact a good deal of the people reading this are likely the RESULT of this effect.