Jeffrey Salazar
The words diet and nutrition are related, but distinct. Diet refers to the food and drinks that a person consumes, and the practice of modifying this to achieve a specific goal. This could be for health reasons, such as weight management or the treatment of chronic conditions, or due to personal beliefs, such as morality or environmental concerns. Nutrition, on the other hand, refers to the process of providing or obtaining the necessary food required for growth and health. A balanced diet is one that provides proper nutrition, including all the necessary nutrients such as protein, iron, calcium, zinc, and vitamin B12.
Characteristics of "diet" and "nutrition"
| Characteristics | Values |
|---|---|
| Definition | Diet: Food and drinks considered in terms of their health and nutritional value. |
| Nutrition: The process of providing and obtaining the food necessary for health and growth. | |
| Synonyms | Diet: Food, meal, eats, nourishment, sustenance, bread, foodstuffs, meat. |
| Nutrition: Nutritive, RDA (recommended daily allowance), regimen, staple diet, well-balanced. | |
| Antonyms | Diet: Rich, heavy, fat, fatty, oily, caloric, greasy, calorific. |
| Diet types | DASH, Mediterranean, vegetarian, vegan, ovo-lacto vegetarian, ovo-vegetarian, paleo, pescetarian, starvation, sugar-free, weight loss. |
| Dietary choices | Exclusionary diets: Avoiding certain foods due to health or personal reasons, e.g., flexitarianism, vegetarianism, veganism. |
| Sustainable diets: Reducing environmental impact by consuming less meat and dairy, and choosing sustainably farmed foods. | |
| Religious diets: Kosher in Judaism, Halal in Islam, vegetarianism in Buddhism. | |
| Nutritional components | Nutrients: Proteins, fats, carbohydrates, vitamins, minerals, fibre, amino acids, herbs, botanicals. |
| Healthy fats: Monounsaturated fats found in avocados, nuts, and olive oil help lower cholesterol. | |
| Electrolytes: Sodium, potassium, magnesium, and chloride maintain body fluid balance. | |
| Glycemic index: Measures how carbohydrates increase blood sugar levels. | |
| Gluten: A protein found in wheat, rye, and barley, also in supplements and cosmetics. | |
| Social factors | Nutrition involves relationships with family, friends, nature, our bodies, and the community. |
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What You'll Learn
Diets for weight management
Weight management is a complex issue that depends on factors such as the amount of food eaten, the type of food eaten, and the timing of meals. Diets for weight management aim to address these factors to promote a healthy weight.
One key factor in weight management is the amount of food eaten. Creating a calorie deficit is the most important factor in weight loss. This can be achieved by reducing the overall number of calories consumed or by increasing physical activity to burn more calories. It is important to note that intentional weight changes should be gradual to avoid potential harm to the body.
The type of food eaten is also crucial. A healthy diet for weight management typically includes a variety of natural, unprocessed foods, with an emphasis on plant-based options. Reducing the consumption of meat and dairy products can have environmental benefits as well. Specific diets, such as the DASH diet or the Mediterranean diet, can be used to manage weight and treat chronic conditions. Additionally, certain dietary compositions, like the ketogenic or high-protein diets, may be considered in consultation with a healthcare provider.
Macronutrient composition plays a significant role in weight management. A low-calorie diet with reduced fat or carbohydrate content is often recommended. However, it is important to note that not all fats are detrimental to health; monounsaturated fats, found in avocados, nuts, and olive oil, for example, can help lower cholesterol and reduce the risk of heart disease. On the other hand, saturated fats, like butter, may contribute to weight gain if consumed in excess. Fiber, a type of carbohydrate, is beneficial as it helps with satiety, digestion, and preventing constipation.
Meal timing is another important strategy for weight management. Intermittent fasting and time-restricted eating have gained popularity as effective methods for weight loss. Higher-calorie breakfasts in combination with overnight fasting may be a useful approach.
It is essential to remember that there is no one-size-fits-all approach to weight management. The best diet for an individual is one that they can consistently adhere to and that promotes a healthy lifestyle. Permanent shifts towards healthier eating habits are more effective than restrictive fad diets. Consulting with a healthcare provider can help determine the most suitable strategies for an individual's specific needs and preferences.
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Exclusionary diets
There are many types of elimination diets, and they should be undertaken with the guidance of a medical professional, especially if there is a known or suspected food allergy. Some common foods that are eliminated include dairy, wheat (including gluten), peanuts, chicken eggs, and cow's milk. It is important to ensure that other foods providing the same nutrients are included in the diet during the elimination phase. For example, if dairy is being eliminated, individuals should consume other calcium-fortified foods or approved alternatives like soy.
Elimination diets can be helpful for managing chronic conditions and identifying food triggers for various symptoms. They are particularly useful for individuals with IBS, ADHD, migraines, eosinophilic oesophagitis, and skin conditions like eczema. However, restrictive diets can also be harmful and lead to nutritional deficiencies, so it is important to consult with a doctor or registered dietitian before starting an elimination diet.
In addition to health considerations, exclusionary diets may also be practised for personal or moral reasons, or to reduce one's environmental impact. For example, some individuals choose to exclude meat and dairy from their diets to lower their carbon footprint and promote more sustainable food choices. Others may adopt vegetarian or vegan diets due to ethical concerns surrounding the treatment of animals. These diets can provide adequate nutrition but may require specific attention to consuming certain nutrients like protein, iron, calcium, zinc, and vitamin B12.
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Religious diets
Religious dietary restrictions can be challenging to navigate, especially when one is unfamiliar with the traditions of a particular faith. Many religions have specific dietary requirements that their followers must adhere to for spiritual reasons, health and wellness purposes, or to achieve a certain ideal.
Judaism
Jewish dietary laws, known as kosher, require that all foods be prepared in a certain way. The most common restriction is the separation of dairy and meat products, meaning dishes containing dairy cannot also contain meat or poultry. Shellfish, pork, and other non-kosher animal species are also prohibited. To follow kosher eating habits, one can eat fruits, vegetables, grains, and legumes while avoiding processed meats and cheeses. Jewish slaughtering procedures may increase the risk of iron deficiency.
Islam
Islamic dietary laws, known as halal, dictate what foods are permissible to be eaten. Most of the rules are derived from the Quran and Hadith (sayings and teachings of Prophet Muhammad). These religious guidelines prohibit alcohol, pork, certain types of seafood, birds of prey, unclean animals (such as rabbits), blood or blood products, and food mixed with animal-derived ingredients. In Islam, meat must be sourced from animals that have been slaughtered using a specific method called dhabiha. The consumption of blood and alcohol is also prohibited, falling under the term 'haram'. Islamic slaughtering procedures may also increase the risk of iron deficiency.
Hinduism
Hindus generally avoid foods they believe hinder spiritual development, such as garlic and onion, and other foods that stimulate the senses. While eating meat is not prohibited, many Hindus avoid it, and beef is strictly forbidden as cows are sacred. Pork and alcohol are also prohibited, with the latter only allowed in moderation on special occasions. A vegan diet, observed by some Hindus, may result in vitamin B12, calcium, iron, zinc, selenium, and n-3 fatty acids deficiencies.
Buddhism
Buddhism does not recognize any formal dietary laws, but the Five Precepts act as loose ethical standards. The third precept consists of avoiding harming any living beings, which may entail refraining from eating meat. While meat is not forbidden, most Buddhists tend towards a vegan diet. Alcohol is generally disallowed, and vegetarianism is common among followers. A vegan diet, as observed by some Buddhists, may result in vitamin and mineral deficiencies.
Seventh-Day Adventists
Seventh-Day Adventists follow a strict lacto-ovo vegetarian diet, abstaining from meat, fish, poultry, alcohol, tobacco, and caffeine. Their diet consists mostly of whole grains, fruits, and vegetables, with legumes, low-fat dairy products, and eggs used sparingly.
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Sustainable diets
A sustainable diet focuses on reducing the environmental impact of an individual's food choices. This can be achieved by lowering consumption of animal products, particularly meat and dairy, and increasing the proportion of plant-based foods in one's diet. Some specific diets considered more sustainable than the standard Western diet include vegetarian, vegan, pescatarian, and semi-vegetarian or flexitarian diets. These diets have been associated with a 12% lower overall mortality risk compared to meat-inclusive diets. However, there is no consensus on the exact amount of animal products that can be consumed while still maintaining a sustainable diet.
To make their diets more sustainable, individuals can adopt a step-by-step approach, gradually increasing their consumption of plant-based foods while reducing animal products. They can also focus on seasonal and local foods, reduce food waste, and consume fish from sustainable stocks, further reducing their intake of red and processed meat, highly processed foods, and sugar.
By making these dietary choices, individuals can positively impact their health and the environment, ensuring the planet can continue to provide enough food and resources for future generations. Sustainable diets are not only about the food we eat but also encompass broader issues of food security, cultural acceptability, accessibility, economic fairness, and the optimisation of natural and human resources.
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Nutritional science
The history of nutritional science is marked by key milestones over the last century. Before it emerged as an independent discipline, mainly chemists studied the chemical composition of food. The early 20th century, known as "the vitamin era," witnessed the isolation and production of the first vitamins, addressing nutritional deficits. From the 1950s to the 1970s, nutritional science focused on dietary fat and sugar, leading to modern labeling requirements that help consumers make healthier choices.
In the following decades, from the 1970s to the 1990s, the field shifted its attention to diet-related chronic diseases and supplementation. Scientists worked on developing healthy strategies for weight management and improving nutrition education. During this time, malnutrition was one of the largest human health problems, especially among children. However, the landscape of nutritional challenges has shifted, and today, there are more overweight than underweight individuals globally, with obesity causing a range of health issues.
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Frequently asked questions
Diet refers to the food and drinks that a person consumes, while nutrition refers to the nutrients that these foods and drinks provide.
Yes, a balanced vegetarian or vegan diet can provide adequate nutrition. However, those on these diets may need to focus on consuming specific nutrients such as protein, iron, calcium, zinc, and vitamin B12.
Changing to a diet and lifestyle that allows an individual to burn more calories than they consume may improve their overall health and prevent diseases attributed to weight, such as heart disease and diabetes.
