We are what we eat! Food impacts our physical and mental health in a big way. According to research healthy eating patterns are associated with better mental health than unhealthy eating patterns. Joseph Firth and colleagues find that bad nutrition could cause the experience of low mood while eating better might not just help the body but also the mind.
The effects of certain foods or dietary patterns on glycaemia, immune activation, and the gut microbiome may play a role in the relationships between food and mood.
Depression and anxiety are the most common mental health conditions worldwide, making them a leading cause of disability. Even beyond diagnosed conditions, subclinical symptoms of depression and anxiety affect the well-being and functioning of a large proportion of the population. Therefore, new approaches to managing both clinically diagnosed and subclinical depression and anxiety are needed.
Relationship between nutrition and mental health
In recent years, people have become more interested in how food affects mental health. Studies show that sticking to healthy or Mediterranean diets—lots of fruits, veggies, nuts, and legumes, with only occasional red meat—might lower the risk of depression. But it’s not straightforward. Sometimes, our mood affects what we eat, like craving “comfort foods” when we’re down or losing appetite due to stress. And for those dealing with long-term mental issues, it’s even tougher to stick to a healthy diet. Things like money, surroundings, and even medications can make it harder.
Though it’s a complicated relationship, in this study, the focus was on how certain foods and diets might impact mental health.
Mood and carbohydrates
Eating a lot of refined carbs can up the chances of obesity and diabetes. The glycaemic index measures how fast carbs in food affect blood sugar and insulin levels. Diets with high glycaemic index and load, like ones heavy on refined carbs and sugars, might also affect mental health. Studies link higher dietary glycaemic index to more depressive symptoms over time. Even controlled experiments show that diets with a lot of these carbs can increase depressive feelings in healthy people.
These refined carbs could mess with mood by causing quick ups and downs in blood sugar. This triggers hormones like cortisol and adrenaline. These ups and downs might lead to changes in feelings like anxiety and irritability. Low blood sugar has also been tied to mood issues.
It seems likely that these rapid changes in blood sugar might explain how refined carbs affect mood, considering how quickly they affect depressive symptoms in studies. But other reasons might explain this link too. High-glycaemic diets are linked to diabetes, which often comes with depression. They share similar issues like insulin problems and brain changes, suggesting they might be connected. Plus, these diets can spark inflammation, which might tie into mental health problems.
Diet, immune activation, and depression
Studies show that sticking to a Mediterranean-style diet can lower inflammation in people. But meals with lots of calories and saturated fat seem to make the immune system more active. This might be a way the Western diet harms the brain, leading to problems like memory decline and damage to the brain’s protective barrier.
Inflammation is linked to many mental health issues, like mood disorders. People with depression often eat foods that promote inflammation, like trans fats and refined carbs, while skimping on anti-inflammatory foods, like omega-3 fats. But we’re not sure if this directly causes depression.
Some treatments that fight inflammation, like certain medications, also help with depression. Certain nutrients and diets, like those in the Mediterranean diet, might lower inflammation too, suggesting they could help prevent or ease depression related to high inflammation.
But it’s not simple. Stress from the day before or a history of depression might make healthy eating less effective at reducing inflammation and improving mood. Plus, not everyone with depression has high inflammation, so these anti-inflammatory treatments might only help some people. More research is needed to see if improving the immune system through diet can really help people with depression linked to inflammation.
Brain, gut microbiome, and mood
The potential link between food and mental well-being might be attributed to the gut microbiome, a collection of tiny organisms residing in the gut. These microorganisms communicate with the brain through various pathways, such as nerves and hormones. Some evidence suggests that alterations in these microbes could be associated with emotions and depression. For instance, manipulating the gut microbes in rodents changes their behaviour, and individuals with depression exhibit different gut microbes compared to non-depressed individuals.
Diet plays a role in shaping these gut microbes. Consuming a Western-style diet high in fats and sugars may disrupt the gut barrier, leading to a condition termed ‘leaky gut.’ Conversely, a diet abundant in fibre, healthy fats, and compounds found in the Mediterranean diet can promote the growth of beneficial microbes. These microbes produce substances that combat inflammation in the body.
A study even indicates that taking probiotics, which are beneficial microbes, could alter how the brain responds to emotions and potentially alleviate depression. However, conclusive evidence linking specific microbes or their byproducts directly to human emotions is lacking. Further research is necessary to ascertain whether dietary changes impacting the gut microbiome can effectively address depressive symptoms and the duration required for such effects to occur.
Eating healthier food and avoiding junk might be good for both our bodies and minds
Moving forward in the research, it’s crucial not to get too caught up in tiny details and forget the big picture. While discovering how certain nutrients or gut-brain connections affect mood is cool, it is important to consider what we already know about how food impacts mental health.
For instance, bad diets can lead to obesity and diabetes, which makes mental health worse. It’s essential to recognise that fixing these health problems is a big deal for making people healthier overall. That’s a priority for making sure everyone stays healthy.
Researchers want to know more about how food affects our brains. They think understanding this could help improve mood and anxiety using food. However more studies are required to figure out if changing the diet can really help prevent mental issues or make them better.
Some studies show that eating a Mediterranean-style diet might help with depression. But other studies didn’t find big benefits from this diet for people feeling a bit down. People’s beliefs about their food can also affect how they feel, so one needs to be careful about how we interpret these results.
People with mental issues often have more heart problems, so a better diet could help with that too. But mental health is complex, and food isn’t the only cause of problems. Mental Health should not be judged only on what one eats. Doing that might even make mental health worse.
The study supports the idea that creating environments and developing measures that promote healthy, nutritious diets, while decreasing the consumption of highly processed and refined “junk” foods may provide benefits even beyond the well-known effects on physical health, including improved psychological well-being.
Source: https://www.ncbi.nlm.nih.gov/
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