I know my mood is always better when I focus on nutrient-dense food. Liver and heart, oysters, seaweed, wild greens, and similar. Yeah, I do okay on steak and eggs, but only for so long. Liver is the best mood lifter I know. Eat a pound, raw if you can, and just try pretending you're depressed. I can't. I just feel like I'm flying for three days.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.