Diet and Mental Health – How Meals Impact Your Mood

Do you fully realize the impact what you eat has on your mental health? While most of us understand the importance of nutrition for physical well-being, fewer people realize that our dietary choices are just as crucial for our brains as they are for our bodies.

If you’re struggling with depression or anxiety, you’re not alone –  1 in 8 people worldwide are battling mental illness, and in the USA, that number jumps to 1 in 5 adults. Evidence shows while standard of care can be life saving, overall they’re less than 50% effective, and that’s if you’re lucky enough to even get an appointment to get treated!
Tragically, up to a third of those struggling with mental illness turn to substance abuse to cope.  What if you could boost your mental health with something as simple as what’s on your plate? Turns out, you can.

Emerging research is showing that food isn’t just fuel—it can literally change your mind. Let’s dig into how you can use your diet to support your mental well-being.

Understanding the Connection Between Nutrition and Mental Health

The saying “you are what you eat” isn’t just a cliché—it’s scientifically grounded, especially when it comes to mental health. The brain relies on a complex network of neurotransmitters, hormones, and electrical signals to function correctly. Just like any machine, the quality of what we put into it determines how well it runs. Key metabolic pathways such as neuroinflammation, oxidative stress, mitochondrial function, and the gut-brain axis are all influenced by diet. Here’s how:

• Neuroinflammation: Chronic inflammation in the brain has been linked to both depression and anxiety. Certain foods help reduce inflammation and protect brain cells, and certain foods can exacerbate inflammation in the body. 
• Oxidative Stress: Oxidative stress is an imbalance between unstable molecules in the body, called free radicals, and the antioxidants needed to render them harmless. Your body naturally produces free radicals through normal processes like breathing and digestion, but when things get out of whack—due to factors like poor diet, pollution, or stress—those free radicals start to pile up and wreak havoc. An imbalance between free radicals and antioxidants can damage all areas of the body, including brain cells, potentially worsening mood disorders.
• Mitochondrial Dysfunction: The mitochondria are the powerhouse of the cell, including brain cells. Dysfunction in these powerhouses can lead to reduced energy availability in the brain, contributing to anxiety and depression.
• Gut-Brain Axis: The gut and brain are closely connected, with the gut producing about 90% of the body’s serotonin—a key neurotransmitter for mood regulation.

Eating nutrient-dense foods that reduce inflammation, disarm free radicals, support the mitochondria as well as the gut can significantly affect mood, energy levels, and overall mental health. Here are specific nutrients and foods needed to support all these systems and activities in the body:

Key Nutrients for Combating Depression and Anxiety

Certain nutrients have been shown to have a direct impact on brain health and mood regulation. Incorporating foods rich in these nutrients can be a game-changer for those struggling with depression and anxiety. Research has been exploring the impact of nutrients on mood. One research team developed an Antidepressant Food Score (AFS) to rank foods based on their concentration of essential nutrients associated with the prevention and treatment of depressive disorders. Another team took a look at the existing research on nutrients, dietary habits and anxiety. Unsurprisingly, there’s a great deal of overlap!  Here is a summary of the most important foods identified to prevent depression and anxiety and the rationale for their importance:

1. Omega-3 Fatty Acids (EPA and DHA)

   • Omega-3s are essential fats that reduce neuroinflammation and improve neurotransmitter function. They are associated with reduced symptoms of both depression and anxiety.
   • Top Sources: Fatty fish (like salmon, mackerel, sardines), flaxseeds, chia seeds, and walnuts. Note that seafood sources are better absorbed than plant sources. We only are able to utilize about 5% of plant omega-3s through conversion to EPA and DHA.

2. B Vitamins (B6, B9 – Folate, and B12)

   • B vitamins are crucial for synthesizing neurotransmitters such as serotonin and dopamine and norepinephrine, which regulate mood and anxiety levels. Deficiencies in B vitamins have been associated with higher anxiety levels.
   • Top Sources: Here, liver tops the charts, hands down. It took me 5 years to figure out how to make liver a regular part of my life, and I cannot begin to tell you what a difference it made! I know not everyone is keen on pâté, so other quality sources are Leafy greens (spinach, kale), legumes (beans, lentils), eggs, and whole grains. 

3. Magnesium

   • Magnesium plays a vital role in regulating the hypothalamic-pituitary-adrenal (HPA) axis, which is part of the body’s stress response system. Low magnesium levels are linked to anxiety and depression and there are case studies in the literature of magnesium alone being effective at alleviating depression in some individuals.
   • Top Sources: Spinach, Swiss chard, nuts (almonds, cashews), seeds (pumpkin seeds), and whole grains.

4. Zinc

   • Zinc is involved in neurotransmitter synthesis and immune function. Low zinc levels have been associated with increased anxiety, and adequate intake may help alleviate symptoms for some people. Additionally, zinc can help reduce neuroinflammation and oxidative stress, which are major contributors to anxiety.
   • Top Sources: Bivalves such as oysters and mussels are the KING of zinc. I typically consume them canned, as they are less expensive and easier to keep around. My seafood dip includes oysters and is a mega-potent source of all sorts of brain supporting nutrients. If seafood isn’t your thing, beef, chicken, beans, and seeds (pumpkin and hemp seeds, specifically) can give you the zinc you need.

5. Antioxidants (Vitamin C, Vitamin E, Polyphenols)

   • Antioxidants protect the brain against oxidative stress, a key factor in the development of anxiety and depression. Antioxidants scavenge free radicals, protect brain cells, and can help reduce symptoms by preventing cellular damage. The plant world is bursting with antioxidants, but the foods below are shown in research to help reduce oxidative stress in the brain. 
   • Top Sources: Berries (blueberries, strawberries, blackberries), citrus fruits (oranges, lemons), dark chocolate, nuts, and seeds.

6. Amino Acids (Tryptophan, Tyrosine, Glycine)

   • Amino acids like tryptophan and tyrosine are precursors to neurotransmitters such as serotonin and dopamine, which help regulate mood.
   • Top Sources: Turkey, chicken, dairy products, seeds, nuts, and bone broth (rich in glycine).

7. Probiotics and Prebiotics

   • A healthy gut is crucial for a healthy mind. Probiotics (beneficial bacteria) and prebiotics (fiber that feeds these bacteria) help maintain a healthy gut microbiome, which in turn influences the production of neurotransmitters like serotonin and gamma-aminobutyric acid (GABA) and these are directly involved in regulating anxiety and depression.
   • Top Sources: Yogurt, kefir, sauerkraut, kimchi (probiotics); vegetables, fruits, legumes, and whole grains (prebiotics).

Top “Antidepressant” and “Anti-Anxiety” Foods to Include in Your Diet

Now that we know which nutrients matter most, let’s look at this another way and dive into specific foods that pack the biggest punch for supporting mental health:

• Fatty Fish (Salmon, Mackerel, Sardines): Rich in omega-3 fatty acids, these fish help reduce inflammation and improve brain function. Aim for three six ounce (170g) servings a week.
• Leafy Greens (Spinach, Kale, Swiss Chard): High in magnesium, folate, and antioxidants, leafy greens are a must for reducing anxiety and improving overall mood. Aim for 2-4 cups of these dark green veggies (raw or cooked) daily.
• Berries (Blueberries, Strawberries, Raspberries): Loaded with antioxidants, berries help protect the brain from oxidative stress and improve cognitive function. Both your gut and your brain absolutely adore darkly colored berries, so have at them! Fresh or frozen is fine. 
• Nuts and Seeds (Walnuts, Almonds, Pumpkin Seeds, Hemp Seeds, Chia Seeds): Packed with omega-3s, magnesium, and zinc, nuts and seeds are perfect snacks for boosting mood. A handful of mixed nuts and seeds daily is all you need.
• Fermented Foods (Yogurt, Kefir, Sauerkraut, Kimchi): These probiotic-rich foods support gut health, which is directly linked to brain health. Aim for 1/2 cup serving most days. If you struggle to digest fermented foods, reach out, as I can help! 
• Organ Meats (Liver): Although not everyone’s favorite, organ meats, and especially liver, are a powerhouse of B vitamins, iron, and zinc—all essential for mental health. The best way to integrate it is by blending it and mixing it in ground beef at 1 ounce per every 4 ounces of beef. Add lots of garlic and herbs to flavor it and mask any flavor as well. 
• Whole Grains (Quinoa, Brown Rice, Oats): Whole grains provide B vitamins and magnesium which support a balanced mood. Get most of your grains from unprocessed sources like oat groats, brown rice, and quinoa.
• Dark Chocolate (70% Cocoa or Higher): Contains polyphenols that have antioxidant and anti-inflammatory properties which help reduce oxidative stress in the brain. How’s that for good news!?
• Citrus Fruits and Bell Peppers: High in Vitamin C and antioxidants, these foods support immune function and protect the brain against oxidative stress, a key factor in the development of anxiety and depression. Population studies also show citrus consumption reduces stroke risk, so these are important to include frequently for brain health. Enjoy lemons, limes, and oranges as well as bell peppers daily if it suits you!

Do your best to get a sampling of most of these foods most days of the week. Look for opportunities to incorporate them into your meals and build upon habits you already have to make it easier! 

Dietary Patterns to Support Mental Health

While individual foods are important, overall dietary patterns can provide a more holistic approach to managing mental health. It can also make it easier to search for new recipes to try.

1. Mediterranean Diet:
   This diet is rich in fruits, vegetables, whole grains, nuts, seeds, fish, and olive oil. It’s been shown to reduce the risk of depression due to its high content of omega-3s, antioxidants, and anti-inflammatory foods. 

2. Plant-Based Diets:
   Plant-based diets which emphasize fruits, vegetables, legumes, whole grains, and nuts provide a rich source of antioxidants and fiber that benefit both the brain and the gut. The benefit to these diets is not that they lack animal protein, it is that they include more unprocessed produce, nuts and whole grains. Your plant-based diet could be a pescatarian diet, it could be a paleo diet, or something in between. Aim for half your plate from non-starchy plants at each meal.

3. Ketogenic Diet:
   This high-fat, low-carb diet promotes ketone bodies as an alternative fuel for the brain. Ketones have been shown to reduce neuroinflammation and oxidative stress, which can be beneficial for anxiety management. Some emerging research also shows promise for a ketogenic diet in schizophrenia and bipolar disorder as well. Keto is difficult to maintain, but can be a game-changer for some who struggle.

Foods to Avoid for Better Mental Health

Processed Foods and Sugars: Foods loaded with refined sugars and carbs can send your blood sugar on a rollercoaster, which puts undue stress on the body, can increase inflammation and worsen anxiety or depression.

Tip: Swap out sugary or processed snacks for a handful of nuts and fresh fruit or greek yogurt to keep your mood steady.

Trans Fats and Partially-Hydrogenated Vegetable Oils: These sneaky culprits are used in many processed foods and fast food restaurants and can increase inflammation and mess with brain function by disrupting cellular communication.

Tip: Opt for healthier fats like olive oil or avocado oil. Trade Crisco for lard – yes, lard! It’s actually healthier. 

Alcohol and Caffeine: Too much caffeine can mess with your sleep and make you jittery, while alcohol can be a major downer.

Tip: Limit to one cup of coffee a day and opt for herbal teas in the afternoon; enjoy alcohol in moderation or skip it altogether for a clearer mind.

Artificial Additives and Sweeteners: These can disrupt your gut-brain connection and affect your mood. One study on the impact of Aspartame (a common non-caloric sweetener) had to be halted early due to the severity of depression symptoms in participants!

Tip: Read labels and choose whole, unprocessed foods. If you need sweetness, go for honey or maple syrup in small amounts. Aim to wean yourself off sweeteners as much as you can to keep blood sugar stable, as this also helps mood. 

Practical Tips for More Mood Balancing Meals