Madeleine Hull
There is a bidirectional relationship between diet and anxiety. While anxiety can influence eating behaviours, certain foods can also increase or decrease anxiety. Research has shown that a diet high in fat and sugar can boost anxiety in animals, and may do the same in humans. In contrast, a well-balanced diet with adequate fruits and vegetables, lean meats, and healthy fats is recommended for those struggling with anxiety.
How does anxiety affect diet?
| Characteristics | Values |
|---|---|
| High-fat diet | Linked to higher anxiety levels in animal studies, possibly due to the disruption of resident gut bacteria and the production of serotonin |
| High-sugar diet | Linked to higher anxiety levels, possibly due to blood sugar dysregulation leading to increased adrenaline and an anxious state |
| Processed foods | Linked to higher anxiety levels, possibly due to a lack of nutrients and blood sugar dysregulation |
| Whole foods | Can positively impact mental health by providing essential nutrients for the brain's neurotransmitters |
| Fruits and vegetables | Associated with lower anxiety levels, possibly due to their antioxidant and anti-inflammatory properties |
| Omega-3 fatty acids | May help reduce anxiety, as seen in a 2011 study on medical students |
| Magnesium | Diets low in magnesium have been linked to increased anxiety, while foods rich in magnesium may promote a sense of calm |
| Zinc | Foods rich in zinc have been associated with lowered anxiety levels |
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What You'll Learn
High-fat diets and anxiety
While there is a clear link between nutrition and mental health, the relationship between diet and anxiety is not yet fully understood. However, there is mounting evidence that a high-fat diet can contribute to anxiety.
A review of the literature found that foods high in fat and/or sugar, or that are highly palatable, can affect behaviour in animal models and may do the same in humans. Animal studies have shown that a high-fat diet can disrupt resident gut bacteria, alter behaviour, and influence brain chemicals in ways that fuel anxiety. Specifically, a high-fat diet has been linked to increased neuroinflammation, decreased autophagy and BDNF levels, and higher expression of genes involved in the production and signalling of serotonin, a neurotransmitter associated with stress and anxiety.
In one study, male adolescent rats were divided into two groups: one group was fed a standard diet of about 11% fat for nine weeks, while the other group was fed a high-fat diet of 45% fat, consisting mostly of saturated fat from animal products. The high-fat diet group gained weight, showed less diversity of gut bacteria, and exhibited anxiety-like behaviour. Another study found that mice fed a high-fat diet for eight weeks developed metabolic disorders, including obesity and hyperlipidemia, and exhibited anxiety-like behaviours.
While more human studies are needed, some research has shown that replacing a high-fat, high-sugar, ultra-processed diet with a healthier one can reduce anxiety. It is important to note that not all fats are bad, and healthy fats like those found in fish, olive oil, nuts, and seeds can be anti-inflammatory and good for the brain. However, exposure to an ultra-high-fat diet, especially at a young age, could boost anxiety in the short term and make the brain more prone to it in the future.
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Diets high in sugar and anxiety
Diets high in sugar can have a significant impact on anxiety levels, and there is a clear link between excessive sugar consumption and negative mental health outcomes. Firstly, it is important to understand the physiological effects of sugar on the body. When sugar rushes through the bloodstream, it causes a feeling of being 'high', but as insulin is secreted to manage the sugar, this often leads to a crash and feelings of being 'low', along with cravings for more sugar. These extreme fluctuations can leave an individual feeling unstable and more vulnerable to anxiety.
The gut-brain connection is an important area of research in understanding the link between sugar and anxiety. It has been found that a high sugar diet can negatively affect gut bacteria, triggering dysbiosis, an imbalance of bacteria in the gut, leading to an overgrowth of bad bacteria. This is significant as approximately 95% of serotonin, a neurotransmitter influencing happiness, is produced in the gut, and a healthy gut corresponds to a positive mental state.
Research has also shown a direct link between diets high in sugar and anxiety. A 2019 study found that regular consumption of saturated fats and added sugars was correlated with higher feelings of anxiety in adults over 60. Another study found that healthy individuals in their 20s experienced worse memory and difficulty with appetite control after just seven days of a high-sugar diet. Furthermore, animal studies have shown that a diet high in sugar can affect behaviour, and it is hypothesised that a similar effect may be seen in humans.
It is worth noting that quitting sugar cold turkey may not be advisable for those with anxiety. Dr Uma Naidoo, a mood-food expert at Harvard Medical School, explains that quitting sugar can lead to physiological withdrawal symptoms, which may trigger a panic attack, especially in those with an anxiety disorder. Therefore, it is recommended to cut back on processed sugar gradually and to focus on a well-balanced diet with adequate fruits, vegetables, lean meats, and healthy fats.
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Nutritional deficiencies and anxiety
Nutritional deficiencies are the most overlooked biological element of someone's mental well-being. Nutritional interventions have demonstrated an antidepressant effect, and there is increasing evidence of the beneficial effects of a healthy diet on mental health. However, the amount of research on anxiety disorders lags behind that of mood disorders.
A healthy balance of sugar, carbohydrates, fats, and proteins is essential for the body to function. Consuming sugar through natural sources like fruit is healthier than consuming candy or hidden sugars in processed foods. A sugar rush can mimic a panic attack, and a diet high in fat and sugar can affect behaviour and increase anxiety.
B vitamins are crucial in hormonal balance, neurotransmitter synthesis, and brain function. Deficiencies in B vitamins, particularly B12, B6, and B9, have been linked to symptoms of depression and anxiety. Vitamin B12, B6, B7, B1, and B complex are all associated with a disruption in the nervous system as well as the circulatory system. B12 and B9, or folate, are at the forefront of mood management.
Magnesium is necessary for most functions in our bodies and is very important in mood regulation. Low magnesium levels alter the body's ability to cope with the physical and emotional effects of stress and anxiety. Magnesium intake has been effective in treating anxiety and related disorders in clinical trials.
Other nutritional deficiencies that have been linked to anxiety include:
- Iron, which is essential for the production of serotonin
- Probiotics, which promote a healthy response to stress and a positive mood
- Omega-3 fatty acids, which regulate dopaminergic and serotonergic neurotransmission, decreasing anxiety
- Vitamin D, which has been associated with mood disorders, including anxiety and depression
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Processed foods and anxiety
A person's diet can have a significant impact on their mental health and anxiety levels. While a healthy diet can help reduce feelings of anxiety, consuming processed foods has been linked to an increased risk of anxiety and other mental health issues.
Processed foods, particularly ultra-processed foods, have been associated with adverse effects on mental health. Ultra-processed foods are formulated to be highly palatable and satisfying, often resembling addictive substances. They are characterized by the presence of substances rarely used in homemade recipes, such as high-fructose corn syrup, artificial flavors, color enhancers, anti-caking agents, emulsifiers, and preservatives. These foods include packaged cereals, snack bars, frozen meals, sweets, and fast-food meals.
Research has found that a higher consumption of ultra-processed foods is associated with increased odds of experiencing anxiety symptoms. A meta-analysis of prospective studies showed that greater intake of ultra-processed foods was linked to a higher risk of subsequent depression. Additionally, a French study found that adhering to a Mediterranean diet in mid-life was associated with a lower risk of depression, particularly in men.
The relationship between diet and mental health is complex and bidirectional. Emotional symptoms can drive eating behaviors, and "comfort eating" is a common phenomenon where individuals consume foods high in calories, sugar, and fat to mitigate negative emotions. However, consuming processed foods high in sugar can lead to blood sugar highs and lows, which can further exacerbate feelings of anxiety.
To manage anxiety effectively, it is recommended to focus on a well-balanced diet with adequate fruits, vegetables, lean meats, and healthy fats. By avoiding processed foods and refined sugars, individuals can stabilize their blood sugar levels and reduce the likelihood of experiencing anxiety symptoms.
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Natural sources of sugar and anxiety
While sugar does not cause anxiety, it can create changes in your body that may worsen anxiety symptoms or trigger anxiety attacks. A sugar rush can mimic a panic attack, and sugar withdrawal can also produce physical symptoms of anxiety, such as shaking and nervousness. Furthermore, sugar consumption can lead to a stomach ache, which can also trigger or worsen anxiety.
Sugar stimulates various sensations in the body. Glucose and the insulin released to counter glucose can cause fatigue, blurry vision, trouble thinking, and general ill feelings. These sensations can make individuals with anxiety more worried about a panic attack, increasing the likelihood of experiencing one.
Natural sources of sugar, such as fruit, affect the body differently than candy or hidden sugars in processed foods. Consuming sugar through natural sources can help maintain a healthy balance of sugar, carbohydrates, fats, and proteins, which is essential for the body to function optimally.
To reduce the impact of sugar on anxiety, it is recommended to cut back on processed sugar and opt for natural sources. This can help stabilise blood sugar levels, reducing the highs and lows that can influence anxiety. Additionally, it is important to be aware of hidden sugars in foods, including savoury items, and to substitute high-sugar beverages like soda with plain water or sparkling water.
While reducing sugar intake can be beneficial, going cold turkey from sugar may not be advisable for those with anxiety. Suddenly stopping sugar intake can mimic withdrawal and trigger panic attacks. Instead, gradual dietary changes are recommended, and it is always a good idea to consult a doctor or nutritionist for guidance.
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Frequently asked questions
A diet high in fat and sugar can increase anxiety. A high-fat diet can alter the gut bacteria, which in turn influences brain chemicals that fuel anxiety. A high-sugar diet can cause blood sugar to dysregulate, which can also contribute to stress and anxiety.
Foods rich in antioxidants, such as turmeric and ginger, may help ease anxiety. Foods with high levels of magnesium, such as leafy greens, legumes, nuts, seeds, and whole grains, may also have a calming effect.
"Comfort eating" is the term used to describe the phenomenon where individuals consume foods high in calories, sugar, and fat in response to negative emotions.
The relationship between diet and anxiety is bidirectional. Emotional symptoms may drive eating behavior because of their immediate effects on mitigating emotional symptoms.
A well-balanced diet with adequate fruits and vegetables, lean meats, and healthy fats is recommended for those with anxiety.
