We all know that a nutritious meal can help us feel better — both physically and mentally (especially when enjoyed with friends and family).

However, is it true that a specific food or nutrient can benefit our mental health? Does eating more blueberries lessen anxiety, or will eating a candy bar worsen depression? 

I asked Dr. Peter Clark, an associate professor of food science and human nutrition at Iowa State University (ISU), to answer questions about the connection between food and mental health.

Clark leads ISU’s...