I'm looking at one of your citations now, and it lumps all households below about $20k into the 'poor' bracket.
That's actually very likely the right thing to do. Thanks to various wealth transfer programs, anyone with earned income <$20k has consumption of approximately $20k.
ftp://ftp.bls.gov/pub/special.requests/ce/standard/2009/income.txt
We don't need to see people literally starving to death to accept that people have a problem getting enough food.
Are people even becoming slightly less fat? That will happen long before anyone starves.