By now, many of us have heard about “good” versus “bad” fats. But a new study, published in the journal Molecular Psychiatry, suggests that stress eradicates the positive effects of choosing good fats.

“It’s more evidence that stress matters,” says lead author Jan Kiecolt-Glaser, professor of psychiatry and psychology at Ohio State University in Columbus.

She says their study is the first to show how stress can cancel out the benefits of eating healthier fats.

The American Heart Association (AHA) provide guidelines for consuming fats and note that dietary fats are crucial for the body’s energy and cell growth. In addition, dietary fats protect the organs and keep the body warm.

However, certain fats are better than others. Saturated and trans fats are the ones that can raise bad cholesterol levels in the body, while monounsaturated fats and polyunsaturated fats can lower bad cholesterol levels. These have been deemed the “good” fats.

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