Leena Watts
Several diets have been shown to reduce cognitive decline, including the Mediterranean diet, the DASH diet, and the MIND diet. The Mediterranean diet emphasizes fruits, vegetables, and lean proteins, while the DASH diet is designed to treat or prevent hypertension. The MIND diet, which stands for the Mediterranean-DASH Intervention for Neurodegenerative Delay, combines elements of the Mediterranean and DASH diets and was specifically designed to combat cognitive decline. It includes 10 brain-healthy food groups, such as green leafy vegetables, nuts, berries, and whole grains, and limits intake of unhealthy foods like red meat, butter, and sweets. Research has shown that adhering closely to the MIND diet is associated with a lower risk of cognitive impairment and slower rates of cognitive decline, especially in women and Black individuals. In addition to these diets, increasing flavonoid intake by consuming colorful fruits and vegetables, such as strawberries, oranges, peppers, and apples, may also help to lower the risk of cognitive decline.
| Characteristics | Values |
|---|---|
| Name of Diet | MIND Diet |
| What it is based on | The Mediterranean and DASH diets |
| Food Groups | Green leafy vegetables, other vegetables, nuts, berries, beans, whole grains, seafood, poultry, olive oil, wine |
| Food Groups to be limited | Red meats, butter, cheese, fried and fast foods, pastries and sweets |
| Benefits | Reduce intake of trans and saturated fats, reduce systemic inflammation, facilitate weight loss, improve the health of the microbiome, ameliorate insulin resistance, lower elevated blood lipids (fats), and slow atherogenesis (clogging of arteries) |
| Other Benefits | Lower risk of cognitive impairment and slower rates of cognitive decline |
| Other Diets | Mediterranean Diet, DASH Diet |
| Other Dietary Components | Antioxidants, fatty acids, B vitamins, vitamin E, vitamin B12, vitamin C, vitamin D |
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What You'll Learn
The MIND diet
Research has shown that adhering to the MIND diet is associated with a reduced risk of cognitive impairment and a slower rate of cognitive decline. A study found that participants with the greatest adherence to the MIND diet had a 4% reduced risk of cognitive impairment compared to those with the lowest adherence. Additionally, the MIND diet was found to have greater effects on cognitive decline than either the Mediterranean or DASH diet alone.
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Flavonoid-rich foods
Flavonoids are plant nutrients with antioxidant, antiviral, and anticancer properties. They are found in a variety of fruits and vegetables, such as strawberries, blueberries, oranges, peppers, and apples. Flavonoid-rich foods have been shown to reduce the risk of cognitive decline.
A study that followed almost 80,000 middle-aged individuals for over 20 years found that those who consumed the most flavonoids were 20% less likely to experience early signs of cognitive decline in later life, even after adjusting for other risk factors such as physical exercise. Another study of over 75,000 adults showed similar results, with those consuming just half a serving of flavonoid-rich foods per day having a 20% lower risk of cognitive decline.
Some flavonoids appear to provide stronger protection than others. For example, flavones, found in yellow and orange fruits and vegetables, were associated with a 38% reduction in the risk of cognitive decline. Anthocyanins, present in blueberries, blackberries, and cherries, were linked to a 24% reduction in risk.
While taking flavonoid supplements may be beneficial, it is important to note that the dosage can vary widely, and it may not provide the same benefits as consuming whole foods. Eating a variety of flavonoid-rich whole foods ensures the intake of additional nutrients like vitamins, minerals, and fiber, which contribute to overall health.
The MIND diet, which merges key features of the Mediterranean and DASH diets, also emphasizes the consumption of flavonoid-rich foods. It encourages the intake of natural plant-based foods, berries, and green leafy vegetables while limiting animal products and saturated fats. The MIND diet has been associated with slower cognitive decline and reduced risk of impairment, particularly in female and Black participants.
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Mediterranean diet interventions
The Mediterranean diet has been shown to reduce the risk of cognitive decline. This diet emphasizes fruits, vegetables, and lean proteins, and healthy fats such as nuts and extra-virgin olive oil. The Mediterranean diet is also associated with lower blood cholesterol levels and positive changes to the gut microbiome.
Several studies have examined the effects of Mediterranean diet interventions. One study looked at the effects of an isocaloric Mediterranean diet on 82 overweight and obese subjects with a habitually low intake of fruit and vegetables and a sedentary lifestyle. After 8 weeks, the group that followed the Mediterranean diet showed improved metabolic health and increased intake of fibre and animal proteins. Another study examined the effects of a 1-year Mediterranean diet intervention on 612 non-frail or pre-frail older adults across five European countries. This study found that adherence to the diet was associated with specific microbiome alterations and reduced frailty.
The Mediterranean diet has also been compared to other diets, such as the DASH diet and the MIND diet, which is based on the Mediterranean and DASH diets but with some modifications. The MIND diet emphasizes natural plant-based foods, berries, and green leafy vegetables, while limiting intake of animal products and saturated fats. Studies have found that the MIND diet may be more effective than the Mediterranean or DASH diets in slowing cognitive decline, particularly in female and Black participants.
Technology-based nutrition interventions using the Mediterranean diet have also been explored as a way to improve diet quality and nutrition knowledge, especially in military populations and those with overweight and obesity. Overall, the Mediterranean diet and its variations have been shown to be effective in reducing the risk of cognitive decline and improving overall health.
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Lifestyle modifications
Diet
The MIND diet, which stands for Mediterranean-DASH Intervention for Neurodegenerative Delay, has been specifically designed to combat cognitive decline. It combines key features of the Mediterranean and DASH diets, with an emphasis on plant-based foods and limited intake of animal and high saturated fat foods. The diet includes 10 brain-healthy food groups: green leafy vegetables, other vegetables, nuts, berries, beans, whole grains, seafood, poultry, olive oil, and wine. It limits the consumption of five unhealthy food groups: red meats, butter, cheese, fried and fast foods, and pastries and sweets. The MIND diet is designed to reduce systemic inflammation, facilitate weight loss, improve the health of the microbiome, ameliorate insulin resistance, lower elevated blood lipids, and slow atherogenesis (clogging of arteries).
The Mediterranean diet, which emphasizes fruits, vegetables, and lean proteins, has also been shown to be effective in maintaining higher cognitive scores compared to a low-fat diet. This diet is supplemented with either nuts or extra-virgin olive oil.
In addition to these specific diets, some general dietary guidelines to reduce the risk of cognitive decline include:
- Eating a variety of colourful fruits and vegetables, especially those rich in flavonoids, such as strawberries, oranges, peppers, and apples.
- Increasing the consumption of fatty acids, especially omega-3 fatty acids found in fish, which have been shown to reduce beta-amyloid plaques associated with Alzheimer's disease.
- Reducing the intake of saturated and trans fats, which have been linked to blood-brain barrier dysfunction and increased Aβ aggregation.
- Consuming foods rich in antioxidants, such as green tea, which has been found to break apart tangles of the protein tau associated with Alzheimer's disease.
Exercise
In addition to dietary modifications, regular exercise is also important for maintaining cognitive health. Public health recommendations suggest that engaging in 40 minutes of brisk walking three times a week can help to reduce the risk of Alzheimer's disease.
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Vitamins and supplements
While there is no conclusive evidence that vitamin and mineral supplements can prevent cognitive decline, certain vitamins and nutrients are known to be beneficial for brain health.
B vitamins, such as B6, B9 (folic acid), and B12, are essential for brain health. However, unless you are deficient or have a high risk of Alzheimer's, a supplement is unlikely to provide additional benefits. Instead, focus on consuming leafy greens and other food sources rich in these vitamins.
Omega-3 fatty acids, found in fish oil, have been linked to a lower risk of cognitive decline, particularly in those with the APOE4 gene mutation associated with Alzheimer's. However, studies have not shown the same effect for omega-3 supplements. Experts recommend consuming fish as part of your diet instead of taking supplements.
Vitamin E, an antioxidant that combats free radicals, has been the subject of large studies investigating its potential to protect against dementia. While the results have not been significant, at least one study suggests it may slow the progression of Alzheimer's in those already diagnosed. Vitamin E is found in nuts, seeds, and vegetable oils.
Additionally, flavonoids, which are plant nutrients with antioxidant, antiviral, and anticancer properties, have been linked to a lower risk of cognitive decline. Consuming just half a serving of flavonoid-rich foods like strawberries, oranges, peppers, and apples daily may reduce your risk of cognitive decline by 20%. However, taking flavonoid supplements is not the same as consuming whole foods, as the dosage and balance of nutrients differ.
While specific vitamins and supplements may not have conclusive evidence of their benefits, adopting a dietary pattern that includes these nutrients may be beneficial. Diets such as the Mediterranean diet, the DASH diet, and the MIND diet, which merge key features of the Mediterranean and DASH diets, have been associated with a reduced risk of cognitive decline.
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Frequently asked questions
The MIND diet, which stands for the Mediterranean-DASH Intervention for Neurodegenerative Delay diet, has been shown to reduce cognitive decline. It is a heart-healthy eating pattern that merges key features of the Mediterranean and the DASH diets. The diet includes 10 brain-healthy food groups: green leafy vegetables, other vegetables, nuts, berries, beans, whole grains, seafood, poultry, olive oil, and wine.
The MIND diet emphasises the consumption of natural plant-based foods and limits the intake of animal and high-saturated fat foods. It specifies the consumption of berries and green leafy vegetables, and does not advocate for high fruit, dairy, potato, or fish consumption.
In addition to the MIND diet, there are other ways to reduce cognitive decline. These include increasing your intake of fruits and vegetables, and ensuring adequate consumption of vitamins E and B12. Regular exercise, such as 40 minutes of brisk walking three times a week, is also recommended.
Yes, some specific foods have been linked to a lower risk of cognitive decline. These include colourful foods rich in flavonoids, such as strawberries, oranges, peppers, and apples. Additionally, leafy green vegetables like spinach and kale have been associated with slower age-related cognitive decline.
