So "Shame on You" right back at you!!
Going beyond that, the United States Census Bureau provides statistics on net household worth, which seems to be the type of "wealth" information you're looking for. They're not all that up-to-date, though:
http://www.census.gov/hhes/www/wealth/1998_2000/wlth98-5.htmlBasically, the net household worth in 1998 was $136,171. According to a google search, this value had increased to $341,300 in 2002 (perhaps being greatly inflated by the stock market bubble and somewhat inflated by inflation itself).
Then, according to the TV Ratings People, there are about 101,000,000 households in the USA, giving the "wealth" of the USA as about $34 trillion dollars. If this value could be magically converted into food for the poor, that'd supply about $15 per person per day for each of this planet's people for a year, surely enough to feed them all. However, what about the second year when all the wealth is gone? Clearly, "wealth" as you define it is utterly irrelevant to considerations such as supplying food to the world's poor. After all, they can't eat diamonds, real estate, or even the $$'s themselves (or maybe they could, but the nutritional value is rather low and the net benefit would be abysmal). Consequently, the influx of all this "wealth" into the food system would do little or nothing to ensure the world's people get fed if there's an underlying food shortage. All that would happen is that the cost of a meal at McDonald's would incrase from $4.39 to $439 or $439,000 (or whatever).
The key parameter to consider is the ability to produce ample food for everyone without triggering bidding wars that will price out hundreds of millions of the poorest people. Believe it or not, every country on earth has this ability (of course, in some cases "Acts of God" cause local or short term crises that require international intervention) provided that the political situation makes it a priority that the poor get fed. Hunger is not a problem of wealth - the earth has plenty of wealth - and it is rarely a problem caused by Nature in a broad sense (at least in Modern Times when food from Afar can be easily supplied) - instead it is a problem specifically of Human Nature.