According to a study by an international team of researchers, your thoughts about marriage equality and racial justice could be linked to your affinity for steaks and sausages. In other words, if the idea of killing another living being for dinner doesn’t leave a bad taste in your mouth, then you’re probably not too bothered by other social injustices, either.

The study, “Rationalizing Meat Consumption. The 4 Ns,” published in the journal Appetite, found that people who justify eating animals by claiming that it is “natural,” “normal,” “necessary” or “nice”—even though it is none of these things—are more tolerant of social inequality in general.

Historically, these same “Ns” have been trotted out to justify everything from slavery to homophobia. For instance, as the study notes, “In defense of male-only voting practices in the U.S. opponents of women’s suffrage often appealed to the necessity of denying women the vote … to the natural superiority of male intelligence, and to the historical normalness of male-only voting as ‘designed by our forefathers.’ … Today, most people find such arguments in support of male-only voting ludicrous at best.”

This confirms what PETA has long maintained: The mindset that condones the oppression of other humans—whether Jews, women, gays or people of color—is the same mindset that permits the exploitation of animals. Prejudices of any stripe arise when we start to believe that “I” am important and “you” are not, that my interests somehow trump those of other living beings.

It’s not surprising that meat-eaters find it necessary to defend their behavior, which is increasingly coming under public scrutiny. In this day and age, anyone who’s been paying attention knows that raising and killing animals for food is destroying the planet, jeopardizing our health and causing tremendous suffering to billions of sentient beings. In today’s meat and dairy industries, animals know little else but pain, fear, injury and disease. Piglets have their tails and testicles cut off without being given painkillers, chickens and turkeys have their throats cut while they’re still conscious and calves are taken away from their mothers within hours of birth.

And the United Nations reports that a global shift toward a vegan diet is vital if we want to combat the worst effects of climate change.

It’s simpler to make excuses—”I grew up eating meat; it’s normal,” or “A plate of spare ribs is so nice after a hard day”—than it is to change behavior. It’s easy to shake our heads in disbelief at what others before us have done but not so easy to examine honestly the biases and prejudices that we hold today.

But there’s hope. As more consumers begin to question the status quo and reject the inherent violence of eating animals, the world will become a kinder place for all of us.

A previous study found that vegans and vegetarians have more empathy than meat-eaters do—for both animals and their fellow humans. Researchers in Europe placed volunteers in an MRI machine and showed them a series of random pictures during scanning. The scans revealed that when observing animal or human suffering, the “empathy-related” areas of the brain are more active among vegetarians and vegans. The researchers also found that there are certain brain areas that only vegans and vegetarians seem to activate when witnessing suffering.

Compassion begets compassion. Change can happen when we begin to recognize that all oppression, prejudice and cruelty are wrong—and that all are connected. We can start with dinner.