Today's New York Times reports the conclusion of an eight-year-long study of millions of schoolchildren completed by economists at the University of California and Columbia University: "ninth graders whose schools are within a block of a fast-food outlet are more likely to be obese than students whose schools are a quarter of a mile or more away."
This study is particularly significant since it adjusted for variables like income, education, and race, thereby making it easier to accurately pinpoint the effect of fast food restaurant proximity to weight.
More specifically, "obesity rates were 5 percent higher among the ninth graders whose schools were within one-tenth of a mile of a pizza, burger or other popular fast-food outlet, compared with students attending schools farther away from fast-food stores."
In a not-at-all surprising move, the National Restaurant Association is shrugging this off since "it did not take individual diet and exercise into account." The argument falls rather flat when you consider that the location of these fast food restaurants clearly had an effect on students' diets.
I have long been a supporter of zoning laws regarding fast food restaurants and schools, and this only strengthens my belief.