Saturday, November 28, 2009

Reality check on American "hunger"   posted by Razib @ 11/28/2009 12:12:00 AM

Hunger here vs. hunger there:
There has been a fair amount of buzz lately (examples here, here, here, here) about "food insecurity" in the U.S. According to the Reuters headline, one in seven Americans is short of food. In looking into the data, what has surprised us is how different the meaning of "hunger" is when we're talking about the U.S. vs. the developing world.

Developing-world hunger: 30% of children underweight


The "food insecurity" categories are derived from people's answers to questions like "We worried about whether our food would run out before we got money to buy more" and "We couldn't afford to eat balanced meals" (full list on pg 3). The details of the answers are found on page 45:


Note in particular the difference regarding children. In the developing world, as shown above, severe child hunger is rampant. In the U.S., even in "food insecure" families, it's extraordinarily rare for children to go hungry even temporarily. And indeed, World Bank data estimates that 1.3% of U.S. children under 5 are "underweight" - less than the 2.3% that would be expected in a fully normal distribution.

On the one hand the poor supposedly live in "food deserts" and so get fat. On the other hand, there's a lot of hunger in America. Something doesn't make sense. As someone whose family is from Bangladesh I have seen plenty of hungry people face to face. They look really hungry. If you're really chronically hungry you can't mask it with a stiff upper lip, you just look starved out, and a bowl of rice with salt is a luxury. They're really short too. When I went to Bangladesh in the late 1980s for a visit I was much taller than many adult beggars despite being a pre-teen, and I was always around the 50th percentile on the height distributions in elementary school.

The fact that fewer American children are very light than would be expected under a normal distribution is also interesting. Assuming weight is a quantitative trait, like height or IQ, one would expect the deviation from the normal distribution to produce a "fatter tail", not an attenuated one.