Dante Carrillo
Diet and nutrition play a significant role in the development of various diseases, with unhealthy diets and malnutrition being major drivers of non-communicable diseases globally. The consumption of certain foods and nutrients can increase the risk of specific ailments, while deficiencies in essential vitamins and minerals can also contribute to health issues. For instance, diets high in sodium and low in vegetables, whole grains, and fatty acids are associated with hypertension, cardiovascular disease, stroke, and type 2 diabetes. Additionally, inadequate vitamin D and calcium can impact bone development and maintenance, while insufficient vitamin K can affect blood coagulation. Recent studies have also found that plant-based diets may alleviate pain and symptoms in neurological and rheumatological disorders.
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What You'll Learn
Dental diseases
Diet plays a crucial role in oral health and can significantly impact the development and progression of dental diseases. Dental diseases, such as dental caries, periodontal issues, and enamel erosion, can be influenced by the types of food and nutrients consumed.
Dental caries, commonly known as tooth decay, is a multifactorial disease strongly associated with sugar intake. The bacteria in dental plaque metabolize fermentable carbohydrates, particularly sucrose, leading to the production of organic acids that lower the pH in the mouth. When the pH drops below 5.5, enamel demineralization occurs, resulting in dental caries. The frequency and amount of free sugar intake directly contribute to the development of dental caries. Additionally, refined foods and other fermentable carbohydrates increase the risk of dental caries. In contrast, starchy staple foods and fresh fruits are associated with lower caries activity.
Malnutrition, including undernutrition and overnutrition, can also exacerbate dental and periodontal diseases. Nutritional deficiencies can lead to oral health issues such as delayed tooth eruption, salivary gland dysfunction, impaired tooth formation, enamel hypoplasia, and bleeding gums. For example, vitamin C deficiency can result in delayed wound healing, dentin malformations, and defective collagen formation. Similarly, vitamin D and calcium deficiencies can cause hypomineralization and delayed tooth eruption.
To maintain good oral health and prevent dental diseases, it is essential to limit the consumption of free sugars and refined carbohydrates. A well-balanced diet that includes starchy staple foods and fresh fruits can help reduce the risk of dental caries. Additionally, incorporating foods like cheese and peanuts can help counter the effects of acid attacks on tooth enamel. Maintaining proper oral hygiene practices, such as brushing twice a day with fluoride toothpaste, flossing daily, and regular dental visits, is also crucial for preventing dental diseases.
In summary, dental diseases are closely linked to diet and nutrition. Excessive sugar intake and malnutrition can increase the risk of dental caries, periodontal issues, and other oral health problems. By adopting a balanced diet, limiting sugar consumption, and practicing proper oral hygiene, individuals can effectively maintain good oral health and reduce the occurrence of dental diseases.
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Nutritional deficiencies
Macronutrient and Micronutrient Deficiencies
Nutrients are substances that our bodies need to function properly and maintain good health. They can be categorised into macronutrients and micronutrients. Macronutrients are required in larger quantities and include proteins, carbohydrates, and fats. Micronutrients, on the other hand, are needed in smaller amounts and include vitamins and minerals like iron, zinc, and iodine.
Macronutrient deficiencies can cause health issues such as kwashiorkor, marasmus, ketosis, growth retardation, impaired wound healing, and increased susceptibility to infections. Micronutrient deficiencies can lead to intellectual impairment, poor growth, perinatal complications, degenerative diseases associated with ageing, and increased morbidity and mortality.
Common Nutritional Deficiencies
- Vitamin B12: Found mainly in animal-based foods like meat and dairy, vegans and vegetarians are at a higher risk of B12 deficiency. Deficiency can lead to mild cognitive impairment and issues with balance, constipation, and dry skin.
- Iron: Iron is essential for red blood cell production and oxygen transport in the body. Deficiency can lead to anaemia, causing symptoms like tiredness, weakness, impaired immune function, and impaired brain function.
- Vitamin D: Vitamin D is crucial for bone health, and its deficiency can cause bone pain.
Dietary Patterns and Chronic Diseases
Unhealthy dietary patterns and nutritional deficiencies are linked to various chronic diseases. These include:
- Cardiometabolic Diseases: Heart disease, stroke, and type 2 diabetes. These are influenced by dietary factors such as insufficient intake of nuts, seeds, omega-3 fats, and whole grains, as well as excessive consumption of processed meat, sugar-sweetened beverages, and red meat.
- Chronic Conditions: Obesity, hypertension, cardiovascular disease, some cancers, and neurological diseases. These are influenced by dietary factors such as high intake of calories, salt, sugar, and fats, coupled with low intake of fruits, vegetables, and high-fibre foods.
Preventing Nutritional Deficiencies
To prevent nutritional deficiencies, it is essential to adopt a balanced diet that includes whole, nutrient-dense foods. In some cases, supplementation may be necessary, especially for those with specific dietary restrictions or medical conditions. Additionally, consulting with a healthcare professional can help individuals determine their particular dietary needs and make informed decisions about their nutrition.
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Hereditary metabolic disorders
There are hundreds of metabolic disorders, and most are extremely rare. Metabolic disorders are classified by the specific building block that is affected. Broad categories include disorders of carbohydrate metabolism, amino acid metabolism, organic acidemias, lysosomal storage diseases, fatty acid metabolism, and mitochondrial disorders. Many of these disorders are associated with neurological issues, and some affect virtually all parts of the nervous system.
Before birth, certain hereditary metabolic disorders, such as phenylketonuria and lipidoses, can be diagnosed in the fetus through prenatal screening tests like amniocentesis or chorionic villus sampling. After birth, many disorders are detected by routine newborn screening tests, but less common disorders may be missed and require specific tests if suspected.
Symptoms that may indicate a hereditary metabolic disorder include sweet-smelling urine (suggestive of maple syrup urine disease) or a body odour resembling sweaty feet (a sign of isovaleric acidemia). Other indicators include eye problems, an enlarged liver or spleen, heart issues, or muscle weakness. Acute crises, lethargy, seizures, persistent vomiting, poor feeding, hypotonia, hypertonia, and developmental delays in infancy and early childhood may also signal a metabolic disorder.
Laboratory testing for metabolic disorders includes hypoglycaemia, jaundice or other signs of liver disease, and hypoglycaemia or low blood sugar. Early diagnosis of these disorders is crucial for improved outcomes, and enzyme replacement therapy and gene therapy offer promising treatment options.
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Food allergies and intolerances
The prevalence of food allergies varies between self-reported and physician-diagnosed cases. In Canada, approximately 7% of individuals self-report food allergies, while the estimated prevalence of physician-diagnosed food allergies is 5-6% for young children and 3-4% for adults in westernized countries. While any food can trigger an immune response, a few foods are responsible for the majority of allergies. Celiac disease, a genetic condition triggered by gluten consumption, is an example of a food allergy. The only current treatment for celiac disease is to maintain a strict gluten-free diet, avoiding cereal grains as the main sources of gluten.
Food intolerances, on the other hand, do not involve the immune system. They occur when the body cannot properly digest a food or when a food irritates the digestive system. Food intolerances generally require a more typical portion size to trigger symptoms, which can be mistaken for those of a food allergy. However, food intolerances are more likely to originate in the gastrointestinal system, with symptoms such as nausea, gas, cramps, abdominal pain, diarrhoea, irritability, or headaches. Lactose intolerance, caused by the lack of the enzyme lactase needed to digest lactose in milk, is one of the most common food intolerances.
The distinction between food allergies and intolerances is essential, as it guides the management and treatment of these conditions. While food allergies require strict avoidance of the offending food, food intolerances may allow for some tolerance of the triggering food in smaller amounts. Consulting a healthcare professional and a dietitian is crucial to determine whether an adverse reaction to food is an allergy, intolerance, or another type of food sensitivity.
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Cardiometabolic diseases
Dietary patterns play a crucial role in the development of cardiometabolic diseases. A poor diet, characterized by excessive calories, sugar, sodium, and fat, leads to nutritional deficiencies, physiological imbalances, chronic inflammation, and disease. Specifically, a high intake of processed meat, sugar-sweetened beverages, and unprocessed red meat increases the risk of heart disease, stroke, and type 2 diabetes-related deaths. On the other hand, a diet rich in plant-based foods, such as fruits, vegetables, legumes, whole grains, nuts, and seeds, is associated with a lower risk of developing cardiometabolic diseases. This is because these foods provide essential nutrients and contribute to maintaining a healthy body weight.
In addition to plant-based foods, certain animal products can also be beneficial in preventing cardiometabolic diseases. For example, dairy intake may be protective against type 2 diabetes, and seafood provides important omega-3 fats. However, it is important to note that a high intake of red meat is associated with an increased risk of cardiometabolic diseases. This may be due to meat consumption being a marker of an overall less healthy diet and lifestyle.
To improve cardiometabolic health, dietary interventions and personalized dietary strategies are often recommended. The Mediterranean Diet, characterized by a high intake of plant-based foods and a lower omega-6/omega-3 fatty acid ratio, has been shown to have positive effects on cardiometabolic health. Additionally, the traditional Japanese diet, which includes a variety of seafood and plant-based foods, has been associated with improved cardiovascular risk factors and a reduced risk of death from CVD, stroke, and ischemic heart disease.
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Frequently asked questions
Many diseases are related to diet, including heart disease, stroke, type 2 diabetes, and some cancers. However, genetics and physical activity levels also play a role in disease risk. For example, osteoporosis is a disease that affects bone fragility and can lead to illness, disability, and premature death, primarily due to aging.
Yes, genetics and physical activity levels are also factors that contribute to an individual's risk of developing various diseases.
An unhealthy diet can lead to malnutrition, which includes undernutrition, overweight, and obesity. Poor nutrition can also cause diet-related non-communicable diseases (NCDs) such as cardiovascular disease, stroke, and type 2 diabetes.
Yes, a diet high in sodium (salt), sugar, and fats, especially industrial trans fats, is linked to an increased risk of cardiometabolic diseases. Ultra-processed foods are also inflammatory and can cause health issues over time.
Yes, the World Health Organization (WHO) recommends eating more fruits, vegetables, legumes, nuts, and grains while reducing salt, sugar, and fat intake. Choosing unsaturated fats over saturated fats is also advisable. Small changes, such as replacing processed foods with healthier options, can significantly impact health over time.
