As people across the globe grappled with higher levels of stress, depression and anxiety this past year, many turned to their favorite comfort foods. But ... the sugar-laden and high-fat foods we often crave when we are stressed or depressed, as comforting as they may seem, are the least likely to benefit our mental health. Instead, whole foods such as vegetables, fruit, fish, eggs, nuts and seeds, beans and legumes and fermented foods like yogurt may be a better bet. Historically, nutrition research has focused largely on how the foods we eat affect our physical health, rather than our mental health. But ... a growing body of research has provided intriguing hints about the ways in which foods may affect our moods. A healthy diet promotes a healthy gut, which communicates with the brain through what is known as the gut-brain axis. Microbes in the gut produce neurotransmitters like serotonin and dopamine, which regulate our mood and emotions, and the gut microbiome has been implicated in mental health outcomes. "The gut microbiome plays a shaping role in a variety of psychiatric disorders, including major depressive disorder," a team of scientists wrote in the Harvard Review of Psychiatry. "Mental health is complex," said Dr. Jacka ... at Deakin University in Australia. "Eating a salad is not going to cure depression. But there's a lot you can do to lift your mood and improve your mental health, and it can be as simple as increasing your intake of plants and healthy foods."