Another negative feedback: Obesity causes global warming, which causes drought, which causes smaller food portions, which reduces obesity, which reduces global warming

Drought is leading restaurants to raise prices, cut portions - latimes.com

The effects of the Midwest drought on prices for corn, meat and poultry are showing up on restaurant menus. Small eateries are being hit hardest.

2010:  'Super-sized' fits even regular food portions at restaurants - USATODAY.com

Many hamburgers, steaks, bagels and pasta entrees are at least two times bigger than the government's definition of a serving, according to nutritionists with the Center for Science in the Public Interest, a Washington-D.C.-based consumer group.

This is a trend that diet experts have been noticing for years, and it hasn't gotten any better, the group says. "The super-sized portions are super-sizing our bodies," says Bonnie Liebman, the center's nutrition director.

"With two-thirds of adults and one-third of kids obese or overweight, you'd think restaurants would shrink their portion sizes, but they haven't, " she says.

"Eating half of what the restaurant serves is often just about right. Half is the new whole."

2009:  Being fat causes global warming, say scientists | Mail Online

Being overweight is bad for the environment as well as your health, according to a study released today.

Researchers at the London School of Hygiene and Tropical Medicine found that overweight people were likely to be more responsible for carbon emissions than slim people because they consume more food and fuel.