Highly educated women have a healthier average weight than less educated women, but the meaning of what is healthier changes with nations relative wealth, according to a new comparison of multi-national data.
The data showed that in countries where malnutrition is prevalent, better-educated women weigh more.
However, in wealthier countries, with rapidly growing rates of obesity, better-educated women weigh less.
"As a population moves through the nutrition transition, it is the most educated, and highest income, who are the first to exit under-nutrition. They are also the first to adjust their diet and physical activity to avoid the deleterious effects of being overweight. It appears that it is women who tend to lead this transition," said John Strauss, professor of economics at the University of Southern California.
In Bangladesh, the poorest country analysed by Strauss and Duncan Thomas (Duke University), more than half of the adult population is underweight.
The study showed that average female body mass increased with every additional year of schooling in Bangladesh
On contrary, only 1 percent of people in the United States are underweight.
The researchers found that in the United States, the wealthiest country in the study, better-educated women had a lower average body mass index.
"Obesity rates rise with economic development which is troubling given the relationship between obesity and cardiovascular disease, stroke, diabetes and possibly cancer," Strauss said.