Foods such as milk, canned tuna, turkey, oats, cheddar cheese, nuts, seeds, breads, chocolate, bananas, and apples are enriched in tryptophan and can contribute to increased circulating serotonin.

“So what are some of these foods? These are things like milk, in particular, whole milk, so full fat milk. I know a number of people choose not to drink milk 'cause they're lactose intolerant. I'm raising my hand 'cause I'm one such person, although when I was a kid, I did enjoy milk. Canned tuna. Turkey, as we mentioned before, high in tryptophan. Oats, I am a consumer of oatmeal so that resonates with me. Cheese and here I read, although not as high in tryptophan as meat and other dairy sources, certain cheeses like cheddar cheeses can be rich in tryptophan. Certain nuts and seeds, certain breads. Chocolate, I know a number of people will be relieved to hear that. I know chocolate lovers are always looking for an excuse to eat chocolate. I confess I've never really liked chocolate, except dare I say, I like the smooth 100% percent chocolates. I know many people gag when they hear a hundred percent, but I actually really like them. And some fruits can be highly enriched in tryptophan, things like bananas and apples and things of that sort, although not nearly to the degree of things like turkey, canned tuna and milk.”