Back in the day, when "health food" became in vogue, it was common to hear the phrase, "You are what you eat."

Now there's research that takes that truism to a scientific level, sister station KOAT health expert Dr. Barry Ramo said.

"I know that when I have a satisfying meal, I'm much happier, and now there is data that suggests that what you eat could have a profound effect on your mood," Ramo said.

There are certain foods that can make us feel better, such as yogurt, cottage cheese with live cultures, naturally fermented pickles, sourdough breads and Swiss cheese, Ramo said.

"All increase healthy bacteria in our gut, where much of the inflammation control and mood regulation begins," Ramo said. "An analysis of 44 clinical trials found that fermented foods and probiotics consistently

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