Milly Gaines
There is increasing evidence of a link between diet and anxiety. Research suggests that a diet rich in fruits and vegetables, omega-3 fatty acids, whole grains, lean meats, and healthy fats can help reduce anxiety symptoms. On the other hand, diets high in sugar, refined carbohydrates, and processed foods may contribute to higher levels of anxiety. While the relationship between diet and anxiety is still being explored, it is clear that what we eat can impact our mental well-being. Some studies also suggest that caffeine, alcohol, and nicotine withdrawal can contribute to anxiety.
| Characteristics | Values |
|---|---|
| Number of people analyzed in the study | Small |
| Comparison between two groups | Did not indicate whether the relationship between diet and anxiety is causal or correlative |
| Food frequency questionnaire | Does not allow for perfect recall |
| Alcohol consumption | Not included in the analysis |
| Foods to avoid | Caffeine, sugar, artificial sweeteners, white bread, pre-packaged dressings and marinades loaded with sugar, "light" or "sugar-free" dressings, gluten, processed meat, fried food, refined cereals, candy, pastries, high-fat dairy products |
| Foods to eat | Whole-grain bread, fruits, vegetables, whole fiber-rich grains, fish, lean meats, healthy fats, whole foods, protein, zinc, magnesium, selenium, probiotics, phytochemicals |
| Diets to follow | MIND diet, ketogenic diet |
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What You'll Learn
High-sugar diets and blood sugar dysregulation
A high-sugar diet can cause blood sugar dysregulation, which in turn can lead to anxiety. The glycemic index (GI) is a system that ranks foods and diets according to their potential to raise blood sugar. High-GI foods include white rice, white bread, crackers, and baked goods. Diets high in these foods can cause drastic spikes in blood sugar, leading to a heightened risk of anxiety.
When we consume too much sugar or high-GI carbohydrates, the rapid increase in blood sugar prompts a sharp rise in insulin. This can result in blood sugar levels that dip below where they started, known as acute hypoglycemia. This dip in blood sugar triggers the release of adrenaline and noradrenaline, which work to restore blood sugar to the appropriate level. However, adrenaline also influences how we feel, and its release can manifest as anxiety, fear, or aggression.
Observational studies have found a link between high-GI diets and the development of anxiety symptoms. One case study found that a 15-year-old female with a diet primarily consisting of refined carbohydrates experienced a substantial decrease in anxiety symptoms when protein, fat, and fiber were added to her diet. When she returned to her previous diet, her anxiety symptoms worsened again.
To stabilize blood sugar levels and optimize mood, it is recommended to reduce sugar and carbohydrate intake and make low-GI carbohydrates dietary staples. Low-GI carbohydrates include parboiled rice, whole-grain bread, and al dente pasta. Eating carbohydrates earlier in the day can also help mitigate blood sugar spikes, as carbohydrates eaten earlier in the day produce a smaller blood sugar spike compared to those eaten later.
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Caffeine and sleep disruption
Caffeine is known to have a significant impact on sleep. It is a common ingredient in many sodas, and its high consumption has been labelled a "rising public health problem in the US". Caffeine affects the brain by blocking adenosine, a sleep-promoting chemical that is produced in the brain during our waking hours. Adenosine buildup in the brain makes us feel sleepy, but when caffeine blocks this process, we remain alert and vigilant. This is why caffeine can disrupt sleep, even when consumed up to six hours before bedtime.
Caffeine can be effective in sustaining performance in the context of sleep deprivation, sedation, and sleep restriction. However, it can also create a vicious cycle, exacerbating sleep deprivation and leading to increased caffeine consumption to cope with the resulting sleepiness. Caffeine intake can reduce total sleep time by 45 minutes and sleep efficiency by 7%, with an increase in sleep onset latency and wakefulness after sleep onset.
The impact of caffeine on sleep is particularly notable when consumed in the afternoon, early evening, or close to bedtime. It is recommended to avoid caffeine in the hours leading up to bedtime to minimize the risk of insomnia and promote better sleep quality. People with chronic insomnia may find it helpful to reduce or eliminate caffeine intake or only consume it early in the day.
The effects of caffeine on sleep can vary depending on individual factors such as nicotine use, pregnancy, and age. For example, nicotine use can shorten the half-life of caffeine, while pregnant people metabolize caffeine more slowly. Additionally, younger individuals tend to consume caffeine later in the day, increasing the likelihood of sleep disruption.
Overall, understanding the temporal effects of caffeine on sleep is crucial. While caffeine can provide a temporary boost of energy, it is not a substitute for adequate rest, and its disruptive effects on sleep can have negative consequences on overall health and well-being.
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Gluten sensitivity
While there is limited research on gluten's effects on the brain, studies have found a connection between gluten and anxiety. Gluten sensitivity and celiac disease can affect the brain, causing psychiatric or behavioural issues, mood disorders, cognitive issues, and psychological effects such as stress and difficult emotions.
Celiac disease is an immune-mediated disease dependent on gluten, which occurs in about 1% of the population. It is generally characterised by gastrointestinal complaints such as postprandial bloating, steatorrhea, and weight loss. Gluten sensitivity, on the other hand, is distinct from celiac disease, with an estimated prevalence six times higher. People with gluten sensitivity do not experience villous atrophy or the presence of antibodies found in celiac disease, but they can test positive for antibodies to gliadin.
The best-characterised neurologic complication related to gluten sensitivity is ataxia, now termed "gluten ataxia". Gluten ataxia is characterised by positive anti-gliadin antibodies, changes in the cerebellum, and ataxic symptoms including upper or lower limb ataxia, gait ataxia, and dysarthria. In one study, 41% of 143 patients with sporadic idiopathic ataxia had anti-gliadin antibodies, compared to only 12% of control subjects.
Research has found mixed results regarding the connection between gluten and anxiety. Some studies show that a gluten-free diet can decrease anxiety in those with celiac disease. One study found that 13% of participants reported reduced feelings of anxiety after adopting a gluten-free diet. Another study found that consuming gluten for three days led to increased feelings of depression in people with non-celiac gluten sensitivity. However, other studies have found that a gluten-free diet did not significantly improve anxiety in those with celiac disease.
It is important to note that a gluten-free diet is not a substitute for traditional mental health treatments such as therapy or medication. If you experience anxiety or other negative symptoms after consuming gluten, it is recommended to consult a healthcare professional to determine if a gluten-free diet is appropriate for you.
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Nutritional deficiencies and inflammation
Nutritional Deficiencies
Nutritional deficiencies can contribute to anxiety and stress. The brain, which regulates mood, relies on optimal fuel from nutrients in food. Whole foods, protein, and healthy fats can positively impact mental health. The brain's neurotransmitters, such as serotonin and dopamine, depend on amino acids from protein and nutrient cofactors (vitamins A, D, C, B, etc.) from other nutrient-dense foods.
A diet high in fat and sugar or highly palatable foods can negatively impact behavior and contribute to anxiety. Sugar, in particular, can cause energy spikes and crashes that can exacerbate anxiety and depression. Caffeine, commonly found in soda and coffee, can also increase heart rate, cause jitters, and disrupt sleep, all of which can worsen anxiety.
Inflammation
Inflammation is another factor that can contribute to anxiety. While the exact mechanism is not fully understood, there is a growing emphasis on gut health in relation to mental health. The microbiome in the digestive tract (the gut) plays a role in mood regulation, and an imbalance in this microbiome may contribute to anxiety.
Dietary Interventions
Dietary interventions are considered low-risk and cost-effective ways to manage anxiety. The MIND diet, developed by Martha Clare Morris at Rush University, is associated with lower levels of anxiety. This diet emphasizes whole, nutrient-dense foods and includes fruits and vegetables, lean meats, and healthy fats. Additionally, caloric restriction, breakfast consumption, a ketogenic diet, and broad-spectrum micronutrient supplementation have all been linked to reduced anxiety levels.
While dietary changes may not lead to immediate improvements in anxiety, they can be a valuable part of an integrated treatment approach that includes therapy, mindfulness techniques, stress relief, and good sleep hygiene.
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Alcohol consumption
Alcohol is a sedative and a depressant that affects the central nervous system. While drinking can help you relax, it can also make you feel anxious. Mild amounts of alcohol can stimulate GABA and cause feelings of relaxation, but heavy drinking can deplete GABA, causing increased tension and feelings of panic. Alcohol use disorder and anxiety disorder are common co-occurring disorders that can cause serious distress and impair your daily functioning.
Alcohol use disorder can exacerbate an existing anxiety disorder or may lead to new anxiety symptoms and vice versa, meaning that a pre-existing anxiety disorder can contribute to an alcohol use disorder. Many individuals use alcohol as an unhealthy coping mechanism to reduce symptoms of anxiety. However, the longer one depends on alcohol to help treat their anxiety, the more at risk they are for developing an alcohol use disorder.
Limited evidence suggests that low-volume alcohol consumption is associated with lower long-term anxiety. Despite the high prevalence and comorbidity of alcohol consumption and anxiety, it is unclear whether alcohol consumption influences long-term anxiety. The significance and direction of the relationship between alcohol consumption and long-term anxiety in studies to date have varied.
It is important to note that the amount and frequency of alcohol use, rather than the type of alcohol, can affect anxiety levels. Alcohol tolerance occurs when an individual needs more alcohol over time to induce the same feelings of euphoria. This can become a vicious cycle because one may initially use alcohol as an unhealthy coping mechanism to help relieve their underlying anxiety, but over time, they will need more alcohol to produce the same effects. Dependence, different from tolerance, develops when the body adapts to regular alcohol use.
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Frequently asked questions
There is evidence that suggests a link between diet and anxiety. A review of the literature found an association between higher levels of anxiety and a high-fat diet, inadequate dietary protein, high intake of sugar and refined carbohydrates, and "unhealthy" dietary patterns.
Foods associated with higher levels of anxiety include caffeine, sugar, alcohol, nicotine, artificial sweeteners, and highly processed foods.
The MIND diet is associated with lower levels of anxiety. It was developed in 2015 by Martha Clare Morris, ScD, at Rush University to delay cognitive decline.
Foods associated with lower levels of anxiety include fruits, vegetables, whole grains, lean meats, omega-3 fatty acids, whole foods, protein, and healthy fats.
In addition to diet, an integrated treatment approach including talk therapy, mindfulness techniques, stress relief, good sleep hygiene, and regular exercise are all important parts of managing anxiety.
