Women are already discriminated against in the workplace for their gender, but research has shown that they're also discriminated against for their weight.

In a 2011 report, the Federal Reserve Bank of St. Louis analyzed data from multiple studies on weight bias in the workplace, concluding that "heavier women tend to earn less," and that "these penalties have not only increased over the past few decades, but continue to increase as women age."

Economist David Lempert conducted his own analysis, finding that for every 10 percent increase in a woman's body mass, her wages decrease 6 percent. For women executives who are overweight, he noted a penalty up to 16 percent.

"So, when you add the penalty for being a woman, plus the penalty for being overweight, for instance, that net penalty is quite large," Lempert said via NPR. "The other side of the coin is that there's an increasing premium for thin women."

Data has not found the same bias among men -- in fact, reports suggest that white males who are overweight actually tend to earn more.

Between 2007 and 2016, a Harvard University study found that while biases towards sexual orientation, race, and gender have decreased in those years, weight bias increased by 40 percent. This comes at a time when 42 percent of the United States population is classified as obese, up from 34 percent in 2008, according to the CDC.

Tessa Charlesworth, researcher at Harvard who worked on the report, said that "it's very disturbing that weight bias is increasing as the number of people who are experiencing it are also increasing."

As weight is not a protected category under the Equal Employment Opportunity Commission, people can even be fired for being overweight. Some states are currently pushing to rectify that, as Massachusetts, New Jersey, and New York have all recently introduced bills to prohibit discrimination based on weight. In Michigan and Washington, such laws already exist.