Leena Watts
The relationship between diet and mental health is a complex one. Research shows that certain foods can help with depression and stress. A healthy, balanced meal can give you an energy boost, while a heavy, greasy meal can leave you feeling tired and irritable. Eating meals with other people has many psychological, social, and biological benefits. The bidirectional relationship between nutrition and mental health means that the foods we eat affect our mental health, and our mental health status affects what and how well we eat.
| Characteristics | Values |
|---|---|
| Diets with fatty fish and seafood | Rich in omega-3 fatty acids, which have anti-inflammatory effects and boost production of mood-boosting neurotransmitters like dopamine and serotonin |
| Fermented foods | Improve gut microbiome by populating it with healthy bacteria that balance out the bad bacteria |
| Refined sugars | Impair brain function and worsen symptoms of mood disorders |
| Processed foods | Enhance inflammation |
| Healthy fats | Found in olive oil, rapeseed oil, nuts, seeds, oily fish, avocados, milk and eggs |
| Whole grains, fruits and vegetables | Improve mental health and reduce symptoms of depression |
| Hydration | Improve mood and energy levels |
| Antioxidants | Found in berries and leafy green vegetables, help fight inflammation |
| Folate | Found in leafy greens, lentils and cantaloupes, helps produce dopamine |
| Vitamin D | Found in salmon, tuna, egg yolks, vitamin-fortified milk and orange juice, helps produce serotonin |
| Magnesium | Found in cacao nibs, almonds, cashews, spinach, bananas and beans, vital to the food-mood connection |
| Mediterranean diet | Shown to have a positive impact on mental health |
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What You'll Learn
Fermented foods improve gut health and boost mood
The relationship between diet and mental health is complex, and while there is no "magic food" that can prevent mental health issues, certain foods can help with depression and stress. Fermented foods, in particular, have been linked to improved mental health.
Fermented foods are preserved using an age-old process that boosts their nutritional value and shelf life. They are made with or contain live, active bacteria, such as sauerkraut, kombucha, tempeh, and yogurt. Fermentation breaks down natural sugars in foods, yielding new compounds like alcohol, carbon dioxide, and lactic acid, which influence flavour, texture, and nutrition.
Fermented foods are high in prebiotics and probiotics, which increase the amount of glucagon-like peptide 1 (GLP-1). They directly impact the enteroendocrine system, affecting hormones such as ghrelin, neuropeptide-Y, and GLP-1, which is involved in regulating blood sugar. By improving the health of the intestinal barrier, fermented foods prevent bacteria and toxins from entering circulation and reduce the risk of leaky gut syndrome.
The gut-brain axis is a well-established concept, and the gut microbiome has been linked to various health conditions, including obesity and neurodegenerative diseases. The intestinal microbiome contains billions of "good" bacteria that protect the lining of the intestines, improve nutrient absorption, and activate neural pathways that travel directly between the gut and the brain. These bacteria produce substances that can travel or send signals to the brain, influencing mood, behaviour, memory, and cognition.
Fermented foods have been shown to improve mood and emotional well-being by populating the gut with healthy bacteria, improving the gut microbiome, and reducing anxiety. They can also help regulate blood sugar, lower allergy risk, and support immune function.
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Omega-3 fatty acids found in fish and seafood
Omega-3 fatty acids are essential for brain development and mental health. They are involved in a wide range of physiological functions related to neurogenesis, neurotransmission, and neuroinflammation, playing a fundamental role in the development, functioning, and aging of the brain.
Omega-3 fatty acids are found primarily in fish oil and certain marine algae. Fatty fish, such as salmon, sardines, tuna, mackerel, and certain types of seafood, are rich sources of omega-3 fatty acids. These polyunsaturated fats have been linked to improved brain function and development throughout all life stages, with a potential emphasis on the developing baby's brain during pregnancy.
The two primary omega-3 fatty acids found in fish oil are eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). EPA and DHA are critical components of cell membranes and possess potent anti-inflammatory properties. They are also crucial for human development and heart health. EPA and DHA can easily pass through the brain cell membrane and interact with mood-related molecules, making them promising candidates for treating mood disorders.
The anti-inflammatory actions of omega-3 fatty acids may help alleviate depression. Meta-analyses suggest that omega-3s are effective in treating mood disorders, although the findings vary due to differences in doses and ratios of EPA to DHA. The most effective preparations seem to contain at least 60% EPA relative to DHA. While DHA may be less effective as an antidepressant, it could have protective effects against suicide.
Additionally, omega-3 fatty acids may help prevent brain aging and cognitive decline. Studies indicate that lower levels of DHA in the blood are associated with smaller brain sizes in older adults, suggesting accelerated brain aging. Omega-3 fish oil supplements may improve memory in individuals with cognitive impairments, such as Alzheimer's disease.
It is important to note that randomized clinical trials investigating the therapeutic effects of omega-3 fatty acids have yielded inconclusive results, and more high-quality trials are needed to establish their efficacy in preventing and treating mental disorders. While omega-3 fatty acids show potential in promoting mental health and treating specific conditions, they should not be relied upon exclusively. A holistic approach to mental health should be considered, including physical activity, time in nature, healthy sleep habits, and a balanced diet.
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The Mediterranean diet
In addition, the Mediterranean diet promotes the consumption of foods rich in omega-3 fatty acids, such as fatty fish and certain types of seafood. Omega-3 fatty acids have been shown to boost the production of mood-enhancing neurotransmitters like dopamine and serotonin.
While the Mediterranean diet has been associated with improved mental health, it is important to note that it is not a magic solution for preventing or treating mental health disorders. Instead, it should be considered as one aspect of a holistic approach to mental well-being, alongside other factors such as physical activity, social connections, and healthy sleep habits.
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Sugar and refined carbs impair brain function
A healthy diet is one way to improve your mental health. Research shows that certain foods can help with depression and stress. For example, fermented vegetables like kimchi are thought to improve your gut microbiome, which in turn can bolster your mood. Fatty fish like salmon, sardines, tuna, and mackerel are rich in omega-3 fatty acids, which have anti-inflammatory effects and can boost the production of mood-boosting neurotransmitters like dopamine and serotonin.
However, a diet high in refined sugars and carbohydrates can impair brain function and even worsen the symptoms of mood disorders, such as depression. Carbohydrates are the preferred energy source for the brain, but the brain cannot store glucose like other organs and muscles in the body. As a result, the brain is dependent on when and what you eat to sustain it for energy. High glycemic index foods can have a detrimental impact on overall brain function, causing a spike in blood sugar, which can be good for immediate functioning, but inevitably leads to a blood sugar crash that can leave the brain starved for more energy. This can make you feel foggy, fatigued, forgetful, anxious, and depressed.
A high-carbohydrate diet has been linked to a higher risk of developing mild cognitive impairment. People 70 and older who eat food high in carbohydrates have nearly four times the risk of developing mild cognitive impairment, and the danger also rises with a diet heavy in sugar. Those with the highest sugar intake were 1.5 times likelier to experience mild cognitive impairment than those with the lowest levels.
A ketogenic diet has been found to be beneficial for people with bipolar disorder, schizophrenia, traumatic brain injury, and Alzheimer's disease. Once the body has adapted to a very low-carb or carb-free diet, the brain uses ketones to meet a large portion of its energy needs, and the liver makes enough glucose to meet the remainder. This results in stable blood sugar levels and the brain gets all the fuel it needs, even though carbs aren't being consumed.
Overall, while a healthy diet is important for mental health, it is not the only factor. Staying physically active, spending time in nature, avoiding cigarettes and alcohol, and developing good sleep habits can also improve mental health.
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Hydration improves mood and energy levels
A healthy diet is one way to improve your mental health. Research has shown that certain foods can help with depression and stress. For example, fermented vegetables like kimchi can improve your gut microbiome, which in turn can improve your mood. Fatty fish like salmon, sardines, and tuna are rich in omega-3 fatty acids, which have anti-inflammatory effects and can boost the production of mood-boosting neurotransmitters like serotonin and dopamine.
Hydration is an important aspect of a healthy diet and can have a significant impact on mood and energy levels. Even mild dehydration can affect your mood, energy levels, and ability to concentrate. Dehydration can trigger physiological responses that mimic anxiety symptoms, such as increased heart rate, irritability, and difficulty concentrating. It can also augment headaches and impact cognition, perception, and energy levels.
A study on the effects of changes in water intake on mood found that reduced water intake led to a decrease in vigor and positive emotions. Another small study on healthy young women found that mild dehydration led to negative shifts in mood, increased perception of task difficulty, and a reduced ability to concentrate.
To maintain proper hydration, men should aim for approximately 13 cups of water per day, while women can stay adequately hydrated with 9 cups. It's important to be aware of any cues signaling potential dehydration and drink accordingly. Staying hydrated can help regulate cortisol levels, as water is essential for hormone production and regulation. Proper hydration can also improve productivity, help you feel more prepared for the day, and boost your confidence.
In addition to staying hydrated, there are other ways to improve your mental health through diet. Eating meals with others can provide psychological, social, and biological benefits. It gives us a sense of rhythm and regularity and helps with digestion. Including whole grains, fruits, and vegetables in your diet, as well as healthy fats found in olive oil, rapeseed oil, nuts, seeds, oily fish, avocados, milk, and eggs, can also contribute to better mental health.
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Frequently asked questions
Yes, research shows that diet has a role in psychological health. A healthy diet can improve your mental health, and your mental health status also affects what and how well you eat.
Eat regularly to keep your blood sugar stable. Stay hydrated—even mild dehydration can affect your mood, energy level, and ability to concentrate. Eat healthy fats like olive oil, rapeseed oil, nuts, seeds, oily fish, avocados, milk, and eggs. Include more whole grains, fruits, and vegetables in your diet.
Foods with Omega-3 fatty acids like salmon, sardines, tuna, mackerel, and black chia seeds are good for mental health. These foods help fight inflammation and support your overall physical and mental well-being. Fermented foods like yogurt, kefir, kombucha, sauerkraut, and kimchi are also good for mental health as they improve your gut microbiome.
The Mediterranean diet has been shown to be beneficial for mental health. The DASH diet (designed to reduce hypertension) and the MIND diet (a combination of the Mediterranean and DASH diets) are also recommended for mental health.
