If you live in the Northern Hemisphere, winter doesn’t just bring shorter days and colder temperatures — it brings a measurable shift in light exposure, circadian rhythm, energy levels, and for many people, mood. When the days stay dark for weeks on end, it’s not a failure of willpower if motivation dips or heaviness creeps in. It’s physiology.

If the winter blues are knocking on your door, you’re not imagining it — and you’re not alone.

While light, movement, connection, and rest all play important roles in supporting mental health during the winter months, there’s another piece that often gets overlooked: what your brain is being fed.

We’ve known for a long time that food is medicine — not just for physical health, but for mental health too. The brain is one of the most nutrient-demanding organs in the body, and mood regulation depends on having the right building blocks available.

Researchers Laura R. LaChance and Drew Ramsey set out to explore exactly which foods deliver those building blocks most efficiently. Instead of focusing on individual supplements or single nutrients, they asked a practical question:

Which whole foods provide the highest concentration of nutrients known to support mental health?

Their findings offer a refreshingly grounded way to think about mood support — especially during the long stretch of winter.

The Science (in plain English)

The brain is one of the most energy- and nutrient-demanding organs in the body. Mood regulation depends on a steady supply of specific vitamins, minerals, and fats that support neurotransmitters like serotonin and dopamine, regulate inflammation, and protect brain cells.

Based on existing research linking nutrient deficiencies to depression, the authors identified 12 key nutrients most strongly associated with mental health:

• Folate
• Iron
• Omega-3 fatty acids (EPA & DHA)
• Magnesium
• Potassium
• Selenium
• Thiamine (B1)
• Vitamin A
• Vitamin B6
• Vitamin B12
• Vitamin C
• Zinc

They then scored foods based on how efficiently they delivered these nutrients per calorie, creating what they called an Antidepressant Food Score (AFS)—essentially a “bang for your bite” ranking for mood support.

The takeaway?

Mood support isn’t about superfoods or perfection—it’s about nutrient density.

Top 5 Plant-Based Mood Foods

These foods scored exceptionally high due to their folate, vitamin C, magnesium, potassium, and antioxidant content.

#1 – Watercress (AFS: 127%)

The highest-ranking food overall. Watercress delivers exceptional amounts of folate, vitamin C, vitamin A, and antioxidants. These nutrients support neurotransmitter production and help reduce oxidative stress, which has been linked to low mood and depression.

#2 – Leafy Greens (AFS: ~74–99%)

This category includes spinach, Swiss chard, mustard greens, turnip greens, beet greens, lettuces, chicory, dandelion greens, kale, and collards.

Leafy greens consistently rank among the most antidepressant plant foods thanks to their folate, magnesium, potassium, and vitamin C content. These nutrients support nervous system regulation, energy metabolism, and serotonin synthesis.

If there’s one plant category to prioritize for mood, this is it.

#3 – Fresh Herbs (AFS: ~73–75%)

Herbs like parsley, cilantro, and basil punch far above their weight nutritionally. They provide antioxidants, vitamin C, and polyphenols that support brain health and help buffer inflammation.

A reminder that “a little garnish” can still matter.

#4 – Peppers (AFS: ~39–56%)

Bell, serrano, and jalapeño peppers contribute vitamin C and carotenoids that support dopamine production and stress resilience. They also add brightness and variety — something many winter plates desperately need.

#5 – Cruciferous & Other Vegetables (AFS: ~35–48%)

This group includes broccoli, Brussels sprouts, cauliflower, red cabbage, kohlrabi, pumpkin, and squash.

While their AFS scores are lower than leafy greens, these vegetables still contribute important antioxidants, fiber, and micronutrients that support gut health — an increasingly recognized player in mood regulation.

Top 5 Animal-Based Mood Foods

Animal foods ranked highly because they deliver nutrients that are either absent or harder to obtain from plants alone — particularly vitamin B12, zinc, iron, and long-chain omega-3s.

#1 – Oysters (AFS: 56%)

No surprise here. Of course they make us happy!

Oysters are the richest dietary source of zinc, a mineral essential for neurotransmitter signaling and associated with improved response to depression treatment. They also provide vitamin B12, iron, selenium, and omega-3s.

Eat oysters regularly and you may end up with a contagiously happy you.

Mostly.

#2 – Organ Meats & Giblets (AFS: ~18–38%)

This category includes liver, heart, kidney, spleen, and poultry giblets.

These foods provide highly bioavailable iron, vitamin B12, folate, zinc, and vitamin A — nutrients critical for brain energy metabolism and emotional regulation. From a nutrient perspective, they are unmatched — even if they require some culinary courage.

#3 – Shellfish (AFS: ~24–30%)

This group includes clams, mussels, octopus, and crab.

Shellfish are exceptional sources of vitamin B12, iron, zinc, selenium, and omega-3 fatty acids. Together, these nutrients support oxygen delivery to the brain, neurotransmitter synthesis, and cellular energy production — foundational elements for stable mood and mental clarity.

A strong showing for the creatures of the deep.

#4 – Fatty & Small Fish (AFS: ~15–21%)

This group includes salmon, sardines, herring, trout, tuna, smelt, and bluefish.

These fish deliver EPA and DHA — the omega-3 fatty acids most consistently associated with reduced depressive symptoms — along with vitamin B12 and selenium. When it comes to mood support, smaller fish quietly outperform their more famous cousins.

#5 – Honorable Mention: Salmon (AFS: ~10-16%)

Salmon is often praised for its omega-3 content — and rightly so. It does contribute EPA and DHA and supports overall brain health. But when it comes strictly to mood food, salmon is outrun by its smaller competitors in terms of antidepressant nutrient density.

That said, let’s not underestimate the psychological lift of a beautifully prepared salmon dish. Culinary pleasure counts too — and joy, after all, is part of the equation.

A Gentle Reminder

Mood is shaped by many factors—sleep, stress, relationships, movement, purpose. Food isn’t a cure-all. But it is one of the most consistent, accessible ways to support your brain chemistry day after day, especially during seasons when light and energy run low.

Sometimes the question isn’t “What’s wrong with me?”

It’s “What might my brain be missing?”

Disclaimer

This article is for educational purposes only and does not replace medical or mental health care. If you’re experiencing persistent low mood or depression, please seek support from a qualified healthcare professional.

Resource

https://pmc.ncbi.nlm.nih.gov/articles/PMC6147775/