Jeffrey Salazar
Nutrition is about eating a regular, balanced diet to fuel your body. Nutrients are substances required by the body to perform its basic functions, and they can be divided into two categories: macronutrients and micronutrients. Macronutrients are the primary building blocks of your diet and provide your body with energy. They include protein, carbohydrates, and fat. Micronutrients, on the other hand, include vitamins and minerals, which support the health of your immune system, cells, and metabolism. While there are many essential nutrients, there are six classes of nutrients required for the body to function and maintain overall health: carbohydrates, lipids, proteins, vitamins, minerals, and water. These nutrients are essential for various bodily functions, including growth, the immune system, and the central nervous system.
| Characteristics | Values |
|---|---|
| Macronutrients | Carbohydrates, protein, and fat |
| Macronutrients energy value | Carbohydrates and protein: 4 kcal/g, Fat: 9 kcal/g |
| Micronutrients | Vitamins and minerals |
| Water-soluble vitamins | Needed in a diet: 300 mg/day |
| Fat-soluble vitamins | |
| Microminerals | |
| Trace minerals | |
| Water | Needed for metabolic processes |
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What You'll Learn
Carbohydrates, protein, and fat are macronutrients
Carbohydrates, proteins, and fats are the three main categories of macronutrients. They are the primary building blocks of your diet and provide your body with energy. They are needed in large amounts and are required daily. Macronutrients are needed to maintain the body's structure and systems. They supply 90% of the dry weight of the diet and 100% of its energy.
Carbohydrates are the body's primary fuel. They provide energy for your muscles and the central nervous system during movement and exercise. The recommended dietary allowance is 45% to 65% of calories per day from carbohydrates. However, this may vary depending on individual health goals and medical conditions. Carbohydrates can be simple or complex. Simple carbohydrates include various forms of sugar, such as fructose and sucrose. Complex carbohydrates, on the other hand, are composed of long strings of simple carbohydrates and are found in foods like whole grains, beans, and root vegetables. They provide energy more slowly than simple carbohydrates but still more quickly than protein or fat.
Protein is the second category of macronutrients. It is essential for many processes in the body, including metabolic, hormonal, and enzyme systems. Proteins are made from long chains of amino acids and are necessary for cell building and repair. The recommended dietary allowance for protein is 0.8 grams per kilogram of body weight per day, which is approximately 60 grams for a 150-pound person. However, individual needs may vary based on age, activity level, medical history, and health goals.
Fat is the third type of macronutrient and is vital for the body for several reasons. It serves as an energy reserve, provides insulation, protects organs, and aids in the absorption and transport of fat-soluble vitamins. The recommended daily intake of fat is about 20% to 35% of total calories, with less than 10% coming from saturated fat.
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Vitamins and minerals are micronutrients
Micronutrients are essential to human health and must be derived from food since the body cannot produce them. Vitamins are organic compounds made by plants and animals, while minerals are inorganic elements present in soil and water. Each vitamin and mineral has a specific role in the body, and an adequate intake of all micronutrients is necessary for optimal health.
Vitamins are necessary for energy production, immune function, blood clotting, and other functions. They can be classified as either fat-soluble or water-soluble. Fat-soluble vitamins include vitamin A, vitamin D, vitamin E, and vitamin K, while water-soluble vitamins include vitamin C and the B-complex vitamins such as vitamin B6, vitamin B12, and folate.
Minerals play an important role in growth, bone health, fluid balance, and several other processes. They can be divided into macrominerals and trace minerals. Examples of trace minerals include iron, which helps provide oxygen to muscles, and copper, which is required for connective tissue formation and normal brain function.
A person who eats a healthy, balanced diet that includes lean proteins, vegetables, fruits, complex carbohydrates, and water will typically get the micronutrients they need. However, those with specific dietary restrictions or medical conditions may need to take supplements to ensure adequate intake of vitamins and minerals.
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Water is an essential nutrient
The body has no way to store water and needs fresh supplies every day. Dehydration can happen when the body's fluids are low. It can be life-threatening, especially to babies, children, and the elderly. Dehydration of as little as 2% loss of body weight results in impaired physiological and performance responses. Even slight dehydration can cause headaches and impaired physical and mental functioning.
Water helps maintain the health and integrity of every cell in the body. It keeps the bloodstream liquid enough to flow through blood vessels. Water helps eliminate the by-products of the body's metabolism, excess electrolytes (such as sodium and potassium), and urea, a waste product formed through the processing of dietary protein.
Water also regulates body temperature through sweating, moistens mucous membranes (such as those of the lungs and mouth), lubricates and cushions joints, and helps prevent constipation. It reduces the risk of urinary tract infections (UTIs) by keeping the bladder clear of bacteria. Water moisturizes the skin to maintain its texture and appearance, carries nutrients and oxygen to cells, and serves as a shock absorber inside the eyes, spinal cord, and in the amniotic sac surrounding the fetus in pregnancy.
The best source of fluids is fresh tap water. Solid foods contribute approximately 1,000 mL (4 cups) of water, with an additional 250 mL (1 cup) coming from the water of oxidation. The average sedentary adult man must consume at least 2,900 mL (12 cups) of fluid per day, and the average sedentary adult woman must consume at least 2,200 mL (9 cups) of fluid per day. People who are pregnant or breastfeeding need more fluid each day than usual.
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Calcium, potassium, and vitamin D are vital nutrients
A healthy diet includes a balance of essential nutrients, which are vital to the body's functioning and overall health. Calcium, potassium, and vitamin D are among these key nutrients.
Calcium is a mineral that is essential for bone health. It helps to build and maintain strong bones and teeth, and also plays a role in nerve signaling and muscle contraction. Good sources of calcium include dairy products like milk, yoghurt, and cheese, as well as dark, leafy greens like spinach and kale.
Potassium is another essential mineral. It is necessary for the normal functioning of all cells, including the regulation of heartbeat, muscle function, and nerve function. Potassium also plays a role in protein synthesis and carbohydrate metabolism. A diet rich in fruits and vegetables is a good source of potassium. Bananas, apricots, prunes, orange juice, squash, and potatoes are all good sources.
Vitamin D is also crucial. It is a fat-soluble vitamin that helps the body absorb calcium and promote bone growth. Additionally, vitamin D supports the immune system and may play a role in reducing inflammation. Sun exposure is a significant source of vitamin D, as it is produced by the body in response to sunlight. However, it can also be found in fatty fish like salmon and tuna, as well as in fortified foods like dairy and cereal.
These three nutrients are vital for maintaining bone, nerve, and muscle health, as well as supporting other important bodily functions. A balanced diet, including lean proteins, fruits, vegetables, complex carbohydrates, and water, typically provides the body with the nutrients it needs. However, some individuals may require supplements, especially if they have certain medical conditions or are taking specific medications.
It is important to note that while these three nutrients are highlighted here, there are other essential nutrients that the body requires for optimal health, including other vitamins and minerals.
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Fibre is a dietary nutrient
Nutrients are compounds that the body cannot make on its own, or in large enough quantities. There are two main groups of nutrients: macronutrients and micronutrients. Macronutrients are the primary building blocks of a diet and provide the body with energy. Micronutrients, on the other hand, are required in smaller doses and include vitamins and minerals.
Dietary fibre consists of naturally occurring "edible, non-digestible carbohydrate and lignin components". Functional fibre, on the other hand, is considered "isolated, extracted, or synthetic" and provides specific health benefits. Examples of functional fibres include inulin, beta-glucans, polydextrose, psyllium, and resistant starch. The addition of functional fibre to foods may help some people increase their overall fibre intake. However, this form of fibre may not yield the same benefits as food sources that contain dietary fibre naturally.
According to the National Academy of Medicine, dietary fibres are non-digestible carbohydrates and lignans that occur naturally in plants. Functional fibres, on the other hand, are extracted from plants or synthetically made and are non-digestible with beneficial health effects in humans.
Promoting a healthy dietary pattern that includes a variety of fibre sources, such as fruits, vegetables, whole grains, legumes, nuts, and seeds, can help individuals achieve the daily recommended amount of dietary fibre. A high intake of dietary fibre is associated with a reduced risk of diverticular disease and a lower risk of heart disease and deaths from cardiovascular disease.
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Frequently asked questions
There are six classes of nutrients required for the body to function and maintain overall health: carbohydrates, lipids, proteins, vitamins, minerals, and water.
Macronutrients are nutrients that are needed in large amounts. They include carbohydrates, proteins, and fats. Micronutrients, on the other hand, are needed in smaller amounts and include vitamins and minerals.
A healthy, balanced diet that includes lean proteins, vegetables, fruits, complex carbohydrates, and water will typically provide all the essential nutrients. Meat, eggs, fruits, vegetables, and whole grains are good sources of minerals. Fatty fish like salmon, mackerel, and trout are good sources of protein and omega-3 fatty acids. Leafy greens provide vitamin A, vitamin C, and calcium. Nuts like hazelnuts, walnuts, and almonds are good sources of plant protein.
Nutrient deficiencies can occur when the body does not get enough of these essential nutrients. In some cases, dietary supplements may be necessary to prevent or address deficiencies. For example, strict vegans may need to supplement their diet with vitamin B12, which is primarily found in animal products. It is important to consult with a healthcare professional before taking any supplements.
