Diff: Macronutrient
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Macronutrients are essential compounds required by the human body in substantial quantities, serving as the foundational elements necessary for life and optimal health. These nutrients play pivotal roles in sustaining energy levels, fostering growth, and supporting various physiological functions. |
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'''Macronutrients''' are nutrients needed in comparatively large amounts. In human nutrition the main macronutrients are carbohydrates, protein, and fat. They provide energy and material for growth, repair, metabolism, and normal body function. |
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== Types of Macronutrients == |
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Macronutrients encompass three primary categories, each with distinct functions: |
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Water is sometimes discussed alongside macronutrients because it is needed in large amounts, but it does not provide dietary energy. Alcohol provides energy but is not treated as an essential nutrient. |
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=== Proteins === |
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Proteins, intricate molecules comprised of amino acids, serve as fundamental building blocks within the body. They contribute to the formation and maintenance of tissues, muscles, enzymes, and hormones. Proteins are integral for cellular repair, immune system function, and can act as an energy source when needed. |
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== Carbohydrates == |
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Carbohydrates include sugars, starches, and fibre. Digestible carbohydrate is broken down into sugars such as glucose, which can be used for energy or stored as glycogen in the liver and muscles. |
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=== Carbohydrates === |
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Carbohydrates represent the principal source of energy for the body. They are classified into two main types: |
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Health guidance generally favours carbohydrates from higher-fibre starchy foods, whole grains, pulses, vegetables, and fruit rather than frequent free sugars. Fibre is not digested in the same way as starch, but it supports bowel function and is linked with healthier dietary patterns. |
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Simple Carbohydrates: Found in sugars such as glucose and fructose, providing rapid energy. |
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Complex Carbohydrates: Present in foods like grains and legumes, offering sustained energy release. They also support digestive health. |
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Carbohydrates play a vital role in sustaining brain function and facilitating physical activity by replenishing glycogen stores in muscles. |
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== Protein == |
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Protein is made from amino acids. The body uses it to build and repair tissues and to make enzymes, hormones, transport proteins, immune proteins, and many structural components. |
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=== Fats === |
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Fats, or lipids, are crucial for several bodily functions and can be categorised as: |
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Protein can come from animal and plant foods. Sources include beans, pulses, fish, eggs, meat, dairy foods, soya products, nuts, seeds, and some grains. Protein quality and amino acid balance matter most in situations such as childhood growth, pregnancy, illness, older age, or diets with limited food variety. |
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Saturated Fats: Present in animal products, essential for hormone production and cell structure. |
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Monounsaturated Fats: Found in sources like olive oil and nuts, contributing to heart health. |
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Polyunsaturated Fats: Present in fatty fish and vegetable oils, containing essential fatty acids crucial for brain function and overall health. |
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Fats serve as a concentrated energy source, protect organs, maintain cell structure, and facilitate the absorption of fat-soluble vitamins (A, D, E, K). |
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== Fat == |
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Fat is a concentrated source of energy. It also supplies essential fatty acids, supports cell membranes, helps absorb vitamins A, D, E, and K, and contributes to hormone and signalling pathways. |
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== Importance in the Human Body == |
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Macronutrients collectively ensure the proper functioning of the body and overall well-being. They supply the energy needed for metabolic processes, sustain physical activity, and support growth. A balanced intake of proteins, carbohydrates, and fats is vital for maintaining optimal health, preventing nutrient deficiencies, and reducing the risk of chronic diseases. |
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The type of fat matters. Unsaturated fats from foods such as fish, nuts, seeds, avocado, and vegetable oils are generally preferred over high intake of saturated fat. Industrial trans fats are not part of a healthy diet. |
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== Dietary Considerations == |
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Achieving a well-balanced diet involves incorporating an appropriate proportion of each macronutrient. Nutritional guidelines vary based on factors such as age, sex, physical activity level, and overall health. It is essential to choose nutrient-dense foods and monitor macronutrient intake to meet individual nutritional needs. |
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== Energy Values == |
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Standard energy values are: |
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* Carbohydrate: about 4 kcal per gram. |
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* Protein: about 4 kcal per gram. |
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* Fat: about 9 kcal per gram. |
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* Alcohol: about 7 kcal per gram, although it is not an essential nutrient. |
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These figures are useful for food labelling and diet planning, but a healthy diet is not only a matter of arithmetic. Food quality, fibre, micronutrients, processing, portion size, and eating pattern all matter. |
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== Dietary Balance == |
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No single macronutrient ratio is right for everyone. Needs vary with age, body size, health, pregnancy, activity, culture, budget, and personal preference. |
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UK advice through the Eatwell Guide presents a practical pattern: plenty of fruit and vegetables, higher-fibre starchy foods, some beans, pulses, fish, eggs, meat or other proteins, dairy or alternatives, small amounts of oils and spreads, and regular fluids. WHO guidance uses the same broad ideas of adequacy, balance, moderation, and diversity. |
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== Low-Carbohydrate and High-Protein Diets == |
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Low-carbohydrate, high-protein, and high-fat diets are often discussed for weight loss, sport, diabetes management, and body composition. Their usefulness depends on the person and the way the diet is built. A diet can meet a named macronutrient target while still being poor in fibre, micronutrients, or food variety. |
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The better question is usually whether the overall pattern is sustainable, nutritionally adequate, and matched to the person's goal. |
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== See Also == |
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* [[Vitamin_K]] |
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* [[Choline]] |
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* [[Matcha]] |
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== References == |
== References == |
National Health Service (NHS). (2022). Eatwell Guide. |
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* [https://www.nhs.uk/live-well/eat-well/food-guidelines-and-food-labels/the-eatwell-guide/ NHS: The Eatwell Guide] |
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* [https://www.nhsinform.scot/healthy-living/food-and-nutrition/eating-well/eatwell-guide-how-to-eat-a-healthy-balanced-diet/ NHS inform: Eatwell Guide] |
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* [https://www.who.int/news-room/fact-sheets/detail/healthy-diet WHO: Healthy diet] |
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* [https://www.merckmanuals.com/home/disorders-of-nutrition/overview-of-nutrition/carbohydrates-proteins-and-fats Merck Manual: Carbohydrates, proteins and fats] |
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* [https://www.westlondon.nhs.uk/ealing-talking-therapies/move-4-mood/eat-well-feel-well/eatwell-guide West London NHS Trust: Eatwell Guide] |
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U.S. National Library of Medicine. (2022). Macronutrients in Health and Disease. |
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[[Category:Nutrition]] |
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[[Category:Medicine]] |