Poor people—and poor women in particular—are more likely to be overweight and obese. But what makes the obesity epidemic such a tough problem to solve is that the poorest Americans are also less likely to use proven weight-loss strategies, relying instead on quick fixes like diet pills.

For a new study published in the American Journal of Preventive Medicine, researchers from Concordia University looked at the incomes and health habits of more than 3,000 children and teens between the ages of 8 and 19 and more than 5,000 adults over the age of 20.

At least two-thirds of the study subjects reported attempting to reduce food intake or exercising in order to lose weight in the past year. Despite these efforts, the adults in the study gained an average of three pounds, while the youths gained about 12 pounds. The people in the lower income brackets gained about two pounds more than those in the highest one.

One reason for the disparity might have to do with the tactics they used to try to shed pounds: Compared to adults making $75,000 or more, those making less than $20,000 were 50 percent less likely to exercise, 42 percent less likely to drink a lot of water, and 25 percent less likely to eat less fat and sweets. And adults making between $20,000 and $75,000 were about 50 percent more likely to use over-the-counter diet pills, which aren't proven to work.