Most healthy eating advice focuses on eating a variety of foods to ensure you’re sampling from a range of different food groups. That way, health experts say, you’re more likely to get everything that your body needs.

But in the latest review of the topic, scientists found that having a diverse diet may not necessarily lead to better health.

In a statement published in the journal Circulation, the American Heart Association reviewed the available studies and reported that there is little scientific support for the idea that a varied diet leads to good health outcomes — especially when it comes to lowering risk of chronic conditions like obesity, heart disease and diabetes. In fact, more diverse diets, according to some of the latest studies the AHA committee reviewed, were linked to worse outcomes on these measures.

That’s because existing studies defined diversity in different ways, the scientists found, and also because people interpreted the need to eat a variety of foods in different ways.