Everyone knows how stressful a negative relationship can be, whether it’s with a mean friend or a hyper-critical parent. These people are doing more than just raining on your parade, they’re making your pants a little tighter, too. Fighting with frenemies can cause your self-esteem to plummet, leading to negative health choices, such as skipping out on the gym and grabbing fast food.

Rather than letting the Negative Nancys of the world get you down, start spending time with people who make you feel good. If you can’t always avoid the negetive person (parents, coworkers, roommates…), choose not to engage. Misery loves company, so if you refuse to let bad moods bring you down, your stress levels—and your waist—will be shrinking in no time.

MORE: Get Rid of Frenemies