5% of our population is starving/malnourished children... http://feedingamerica.org/hunger-in-america/hunger-facts/chi... Everyone reading this forum has probably never come close to actually dealing with the poverty levels that afflict a surprisingly large amount of people in America. The level of accepted inequality with almost no social welfare net is atrocious.
I'm about to say something which is indelicate, but probably true.
Poor Somalis look like poor Chinese look like poor Brazilians look like poor peasants from the Middle Ages, because human physiology reacts to starvation in predictable ways. Poor Americans do not resemble any of the above, because to the extent they have a problem with food, it is that they consume far too much of it. You can measure the nutritional consumption of poor Americans. We have. It is statistically virtually indistinguishable from that of rich Americans. Poor American kids? Same story.
(Some people might phrase poor folks' food problems as "too much of the wrong food", but I think this conflates the problem with a moral judgment about food-as-values-signaling. One of the reasons we stigmatize e.g. Coke over e.g. fresh squeezed orange juice is precisely because poor people drink Coke and rich people drink fresh squeezed orange juice. Both would be better off with switching more of their beverage consumption to tap water.)
See generally :
http://www.heritage.org/research/reports/1990/09/how-poor-ar...
or you can make anecdotal observations by going to any high-poverty region of America and, well, looking.