Leena Watts
Diet and nutrition have been shown to play a role in degenerative diseases, including obesity, cardiovascular disease, diabetes, chronic kidney disease, cancers, osteoporosis, and eye conditions such as cataracts and macular degeneration. A high-glycemic diet is associated with the onset and progression of age-related macular degeneration (AMD), which affects over 2 million Americans aged 50 and older. The Mediterranean diet, which includes plenty of fruits, vegetables, legumes, and fish, has been promoted as a way to reduce the risk factors associated with these diseases. Furthermore, a diet rich in essential vitamins and minerals can help prevent eye conditions, and omega-3 fatty acids found in oily fish may reduce the risk of age-related macular degeneration.
| Characteristics | Values |
|---|---|
| Diets rich in vitamins and minerals | Can prevent eye conditions such as cataracts and macular degeneration |
| Omega-3 fatty acids | Can be found in oily fish such as salmon, tuna, and sardines, and may reduce the risk of age-related macular degeneration |
| Vitamins A and E | Vital in protecting eye health and can be found in dark green vegetables and fruits like blueberries and peaches |
| Lutein and zeaxanthin | Natural pigments that protect the retina and can be obtained through diet |
| Mediterranean diet | Can help reduce the risk of obesity, CVD, CKD, RA, and other CDDs |
| Low carbohydrate diet | Can be used as a strategy for lipoedema treatment, able to reduce subcutaneous limbic adipose tissue and improve quality of life |
| High intake of alkaline foods | Can contribute to a reduction in cardiometabolic disorders |
| High glycemic diet | Can be associated with AMD onset and progression |
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What You'll Learn
Omega-3 fatty acids and age-related macular degeneration
Age-related macular degeneration (AMD) is the leading cause of blindness and visual impairment in developed countries, affecting over half of those with certifications for blindness or partial sight in the UK. It is a disease that leads to vision loss in older adults, causing degenerative changes within the macula, the central area of the retina responsible for detailed vision and colour perception.
Omega-3 fatty acids are believed to lower the risk of AMD, with studies showing that there is an inverse relationship between the dietary intake of omega-3 long-chain polyunsaturated fatty acids (LCPUFAs) and the risk of developing AMD or progressing to advanced AMD. Omega-3s are thought to work by decreasing inflammation within the eye, increasing tear fluid production, and reducing the buildup of triglycerides associated with cardiovascular disease. They are also the main structural components of the retina, providing anti-angiogenic and anti-proliferation protection for the blood vessels, as well as having neuroprotective effects.
The body cannot synthesize omega-3 fatty acids, so they must be consumed through diet or supplements. Oily fish such as salmon, tuna, and sardines are good sources of omega-3s, as are supplements containing eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). These acids can also be derived from alpha-linolenic acid found in flaxseed oil, canola oil, or walnuts. However, it is generally more efficient to obtain omega-3s through diet rather than supplementation.
While there is considerable evidence to suggest the benefits of omega-3 fatty acids in preventing or slowing the progression of AMD, the results of some studies, such as Age-Related Disease Study 2 (AREDS2), have been inconclusive. Nevertheless, the potential of omega-3s in preventing AMD warrants further research, particularly as there is currently no cure for the disease.
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Diets rich in vitamins and minerals for eye health
Many eye conditions, such as cataracts and age-related macular degeneration, may be prevented with diets rich in essential vitamins and minerals. A healthy diet can help maintain eye function, protect your eyes against harmful light, and reduce the development of age-related degenerative diseases.
Vitamins A, C, and E are essential nutrients with antioxidant properties that are beneficial to the eyes. Vitamin A is essential for maintaining the eyes' light-sensing cells, known as photoreceptors. Dark green vegetables like kale, spinach, and collard greens are rich in vitamin A and lower the risk of long-term eye diseases. Orange-colored fruits and vegetables, like sweet potatoes, carrots, and cantaloupe, are high in beta-carotene, a form of vitamin A that aids in night vision and the eyes' ability to adjust to darkness.
Vitamin C is also important for eye health, and a 2017 study found that the levels of vitamin C in the aqueous humor of the eye may be directly proportional to intravenous intake. Vitamin E is another crucial nutrient for eye health, and its benefits can be obtained through diet or supplementation.
In addition to these vitamins, minerals like zinc and selenium are important for eye health. Selenium acts as a preventive antioxidant for several eye conditions, including age-related macular degeneration and cataracts. Lutein and zeaxanthin are also important nutrients for eye health, and they can be obtained through a diet rich in dark green vegetables.
Omega-3 fatty acids, found in fatty fish like salmon, tuna, and sardines, are essential for maintaining eye health. They contribute to the structure of cell membranes in the eyes and support visual function. Omega-3s also have anti-inflammatory properties, which can help reduce the risk of age-related macular degeneration and glaucoma, as well as alleviate symptoms of dry eye syndrome. A proper omega-6 to omega-3 ratio is important, with a 4-to-1 ratio or less of omega-6s to omega-3s being sufficient.
Adopting a Mediterranean diet is a simple way to incorporate many of these eye-healthy nutrients into your daily meals. This diet includes ample servings of fatty fish, whole grains, fruits, and vegetables, providing most of the antioxidants relevant to eye health.
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The Mediterranean diet and chronic degenerative diseases
Chronic degenerative diseases (CDDs) are a leading cause of premature death and prolonged disability worldwide. These include obesity, cardiovascular disease (CVD), diabetes, chronic kidney disease (CKD), inflammatory bowel diseases, osteoporosis, cancers, and many others.
The Mediterranean diet (MD) is one of the best dietary patterns to combat CDDs. It is characterised by a high intake of plant-based foods, including vegetables, fruits, whole grains, nuts, legumes, and olive oil. The MD also includes moderate amounts of fish, poultry, and dairy, and limited amounts of red meat and processed foods. This dietary pattern has been shown to have beneficial effects in preventing chronic diseases due to its anti-inflammatory and antioxidant properties.
Several studies have demonstrated the positive impact of the MD on health and its ability to reduce the risk of CDD development and progression. The EPIC study, for example, found a 12% reduction in cancer incidence among those with greater adherence to the MD over an 8-year period. Another study, focusing on sedentary individuals consuming Western-style diets, found that higher adherence to the MD was associated with a reduced risk of Alzheimer's disease.
In addition to its health benefits, the MD has been shown to improve quality of life. For instance, the MD has been linked to improved sleep quality and a shift towards healthier eating habits and behaviours. Furthermore, when combined with physical activity, the MD has been shown to promote weight loss and reduce cardiovascular and metabolic risk factors, especially in obese individuals and postmenopausal women.
Overall, the Mediterranean diet, along with regular physical activity, represents a priority strategy to combat the burden of chronic degenerative diseases and promote a healthier and longer life.
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Low-carb diets for lipoedema treatment
Lipoedema is a chronic pathology of the subcutaneous adipose tissue that was first defined by Allen and Hines in 1940. It is a fat disorder that has traditionally been thought to be resistant to diet and exercise. However, recent research has shown that a very low-carbohydrate, high-fat diet, known as a ketogenic diet, can be effective in managing lipoedema.
The ketogenic diet involves restricting carbohydrate intake to less than 20 grams per day, which shifts the body from burning sugar to burning fat for fuel. This reduction in carbohydrates results in the production of ketones from fat, a process called ketogenesis. This diet has been shown to minimize the symptoms of lipoedema, such as pain, swelling, and weight gain, and improve the quality of life for those with the condition.
One of the key benefits of the ketogenic diet for lipoedema is its anti-inflammatory effects. By reducing inflammation, the diet can help manage the swelling and pain associated with lipoedema. Additionally, the diet's ability to regulate blood sugar can also contribute to its effectiveness in treating the condition.
While the ketogenic diet has shown promising results, it is important to note that it may not be the only effective treatment for lipoedema. Other conservative treatments, such as compression therapy, manual lymph drainage, skincare, and exercise, can also be incorporated into a comprehensive management plan for lipoedema. It is recommended to work with a trained therapist familiar with lipoedema to develop a personalized protocol for treatment and management.
Furthermore, it is worth mentioning that nutritional programs for lipoedema should not solely focus on weight loss. Instead, they should aim for long-term management of the condition and improving the overall quality of life for those affected. The Mediterranean diet, for example, has been found to be partially effective in managing lipoedema due to its glycemic control and the simultaneous intake of vitamins and polyphenols.
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High-glycemic diets and age-related macular degeneration
Age-related macular degeneration (AMD) is a leading cause of vision loss in people aged 50 and older. There are two types of AMD: dry and wet. While there are therapies for the wet form, most people have the dry form, for which there is no effective treatment. Doctors can prescribe certain supplements to slow down damage to the retina, but there is no way to delay the progress of the disease before it impairs vision.
A high-glycemic diet is associated with the onset and progress of AMD. Carbohydrates with a high glycemic load, such as white bread, are rapidly digested, causing spikes in blood sugar. Carbohydrates with a low glycemic load, such as whole-grain bread, take longer to digest and involve the action of gut bacteria, collectively known as the microbiome.
A team of researchers from Tufts University, led by Drs. Allen Taylor and Sheldon Rowan, explored the impact of dietary carbohydrates on retinal damage, a sign of AMD. They hypothesized that switching middle-aged mice from a high glycemic diet to a low glycemic diet would delay or stop retinal damage. The results showed that mice fed a high glycemic diet developed signs of retinal damage, while those on a low glycemic diet did not exhibit significant retinal changes. When the mice on the high glycemic diet were switched to a low glycemic diet, the build-up of certain harmful metabolic factors in eye tissue was delayed, stopped, or even reversed.
Inspired by these findings, the team conducted a study on humans, feeding groups of mice the same number of calories but varying the type of carbohydrate. They fed 19 mice a low glycemic diet and 40 mice a high glycemic diet. After six months, 17 mice were switched from the high to the low glycemic diet. Six months later, the researchers analyzed the differences in the three groups of mice, which had reached old age. The results confirmed that a high-glycemic-index diet is a risk factor for early AMD, and that low-glycemic-index foods may protect against it.
In addition to a low-glycemic diet, a diet rich in green leafy vegetables, such as spinach, kale, and collard greens, as well as fish (such as salmon, sardines, tuna, or mackerel, eaten twice a week), can also help reduce the risk of AMD. Omega-3 fatty acids, found in oily fish, may reduce the risk of AMD by decreasing inflammation within the eye, increasing tear fluid production, and decreasing the buildup of triglycerides associated with cardiovascular disease.
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Frequently asked questions
Yes, diet can have an effect on degeneration. For example, a high-glycemic diet is associated with the onset and progression of age-related macular degeneration (AMD).
Age-related macular degeneration is a disease that leads to vision loss, particularly in people over 50. It affects the macula, a small area near the center of the retina, which is needed for sharp, central vision.
Population studies have found that, in addition to diet, metabolic changes and the gut microbiome can also contribute to the development of AMD.
Yes, increasing your intake of omega-3 fatty acids may help slow macular degeneration and prevent cataracts. Omega-3 fatty acids can be found in oily fish such as salmon, tuna, and sardines.
Yes, diet can also play a role in preventing chronic degenerative diseases (CDDs) such as cardiovascular disease, diabetes, and inflammatory bowel diseases. For example, the Mediterranean diet is often recommended to reduce the risk factors associated with these conditions.
