Most of it is produced in the body. Lipids or fats are macronutrients that are important in human nutrition. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. In the central and peripheral nervous systems, lipids control fluidity of membranes and aid in electrical signal transmissions. 2) Phospholipids make up only about 2 percent of dietary lipids. Waxes are produced naturally by skin glands as a protection, to keep it lubricated, pliable, and water-proof. Saturated fats are solid at room temperature and are typically derived from animal products such as meat, butter, and cheese. Lipids perform functions both within the body and in food. Phospholipids (Membrane Lipids) 3. Quite often, lipids function alongside proteins. Trans fats, or "partially hydrogenated oils," are artificially made to have a certain texture desired for processed foods. Lipids help stabilize synapses. The five functions of lipids are: acting as an energy source, providing insulation and protection to organs, giving structure to cell membranes, insulation and generating heat when . Overweight and UnderweightWhat are the Risks? There are four major biological macromolecules classes: carbohydrates, lipids, proteins, and nucleic acids. Lipid rafts are characterized by being microdomains of about 10 to 300 nanometers (nm). Vegetable oils also provide some vitamin K, and fatty fish and eggs are good sources of vitamins A and D. Below are images of foods that contain the four fat-soluble vitamins. Fats are composed of a glycerol and three fatty acids and are used for energy storage. Sphingolipids play a role in cytokinesis during interphase. In fact, phospholipids are synthesized in the body to form cell and organelle membranes. Cholesterol is an important component of the cell membrane and is required to synthesize sex hormones, vitamin D, and bile salts. Lipids' function in the body and related risks. When saturated fatty acids combine with triglycerides, this results in solid fats at room temperature. Saturated fats have single bonds, are solid at room temperature, and generally come from animal sources. According to a publication in Molecular Biology of the Cell, these are structural or signaling functions. Dietary fat thus contributes tosatietythe feeling of being satisfied or full. Lipoproteins aid in the transport of cholesterol though the body. Depending on the level of physical activity and on nutritional needs, fat requirements vary greatly from person to person. Vitamins A, D, E, and Kthe fat-soluble vitaminsare mainly found in foods containing fat. So, what foods raise triglyceride levels? Energy reserve is the main function of lipids. They consist of at least one sugar unit, so they are also called glycosphingosides. The blanket layer of subcutaneous fat insulates the body from extreme temperatures and helps keep the internal climate under control. The main biological functions of lipids include storing energy, as lipids may be broken down to yield large amounts of energy. HDL cholesterol is known as the good cholesterol and helps remove cholesterol and transport it back to the liver. They also offer many health benefits. These same lifestyle choices can also help boost your HDL cholesterol, as can including plenty of fish, olive oil, vegetables, legumes, nuts and high-fiber fruits in your diet. Some waxes and oils are also lipids. For eg., fats and waxes. Phospholipids are found in both plants and animals but make up only about 2 percent of dietary lipids. Lipids: Group # 1. Nutrition Through the Lifecycle - Young Adulthood - Middle Age, 22. The liver produces lipoproteins that help carry fat and cholesterol through your bloodstream. The Functions of Lipids in the Body Storing Energy The excess energy from the food we eat is digested and incorporated into adipose tissue, or fatty tissue. Figure 5.10. To provide energy for the organisms, which is greater than whats provided by carbohydrates or proteins. 2007;176(8):1113-1120. doi:10.1503%2Fcmaj.060963. Triglycerides and cholesterol may pose health risks if your levels are too high. Sphingophospholipids They are the important constituents of myelin and are abundantly found in the brain and nervous tissues. Richard N. Fogoros, MD, is a retired professor of medicine and board-certified internal medicine physician and cardiologist. Antiphospholipid syndrome. Emulsions are mixtures of two liquids that do not normally mix (oil and water, for example). Some of this fat is stored within the abdominal cavity, called visceral fat,and some are stored just underneath the skin, called subcutaneous fat. Foods rich in oils include salad dressing, olives, avocados, peanut butter, nuts, seeds, and some fish. Some examples of lipid storage diseases include Fabry disease, Gaucher disease, Niemann-Pick disease, Sandhoff disease and Tay-Sachs. The glyceride in the word triglyceride refers to this glycerol backbone, while the tri refers to the fact that there are three fatty acids attached. Naturally occurring triacylglycerols are found in many foods, including avocados, olives, corn, and nuts. Lipids are hydrophobic. Making dietary choices that limit the intake of saturated (and trans, another type of fat) fats to the recommended levels, replacing saturated and trans fats with unsaturated fats, increasing physical activity, and quitting smoking can reduce the risk of developing heart disease and other ailments. 1) Triglycerides make up more than 95 percent of lipids in the diet and are commonly found in fried foods, butter, milk, cheese, and some meats. lipids have variety of compounds such as fats, phospholipids, and steroids that have vital functions in cell but most common are fat lipids. As a result, it is grainy andflavorlessnothing like its full-fat counterpartand many additives are used to replace the lost flavor. Lipids are made of a triglyceride that is made from the alcohol glycerol, plus fatty acids. Lipids perform three primary biological functions within the body: they serve as structural components of cell membranes, function as energy storehouses, and function as important signaling molecules. When the body has used all of its calories from carbohydrates (which can occur after just twenty minutes of exercise), it initiates fat usage. Lipids also participate in cell division. For eg., phospholipids and sphingolipids. But unlike triglycerides, phospholipids only have two fatty acid molecules attached to the glycerol backbone, while the third carbon of the glycerol backbone is bonded to a phosphate groupa chemical group that contains the mineral phosphorus. Terpenes 9. fatty acids) is only one type of lipid. Lipids are organic compounds that are high in energy and supply energy for a variety of living functions. Fatty acids can be saturated or unsaturated. The phloem, one of the chief transport portions of plants (along with the xylem), contains lipids such as cholesterol, sitosterol, camposterol, stigmasterol and several varying lipophilic hormones and molecules. They help form the epidermis, which serves as the outermost skin layer that protects from the environment and prevents water loss. The various lipids may play a role in signaling when a plant is damaged. For instance, both worms and flies can live longer if their genes for ceramide and sphingolipid . Nutrition in the Lifecycle - Conception to Pregnancy, 18. The three main types of lipids are triacylglycerols, phospholipids, and sterols. Lipids perform functions both within the body and in food. Lipids also help the body produce and regulate hormones for everything from appetite to the reproductive system to blood clotting. Fat also adds texture, making baked foods moist and flakey, fried foods crispy, and adding creaminess to foods like ice cream and cream cheese. Lipids perform three primary biological functions within the body: they serve as structural components of cell membranes, function as energy storehouses, and function as important signaling molecules. High levels of HDL reduce your risk of cardiovascular (heart) disease. Fatty acids are classified by their carbon chain length and degree of saturation. Fats satisfyhunger(theneedto eat) because theyre slower to be digested and absorbed than other macronutrients. True Fats 2. Lipids have a range of functions, including: Lipids are a very important part of your nervous system. When medical professionals refer to lipids as blood fats, this describes the kind of fats often discussed regarding cardiovascular health, particularly cholesterol. As a result, high-fat foods are a convenient source of energy. What are the 3 types of lipids and their functions? AAPS J. Biological lipids are a chemically diverse group of organic compounds which are insoluble in water. APS often happens in people with lupusespecially women. Always remember that fats are important and can be found across the spectrum. In the body, fat functions as an important depot for energy storage offers insulation and protection and plays important roles in regulating and signaling. As discussed in the Carbohydrates chapter, glucose is stored in the body as glycogen. Cosmetics and skincare manufacturers add lipids to products to improve skin moisturization, protection, and repair. Medicines that target sphingolipids are being considered as treatments for ALS patients. 5.8. Simple lipids are esters of fatty acids with various alcohols. The polar heads contact the fluid inside and outside of the cell. Cholesterol is found in every cell in the body and takes part in many important body functions, like making hormones and vitamin D. Cholesterol is also key for making bile salts, the substances that help the body break down fat and absorb vitamins. Steroids Name 3 functions of lipids? Waxes. Every cell in the body is encased in a membrane composed primarily of a double layer of phospholipids (also known as the phospholipid bilayer), which protects the inside of the cell from the outside environment while at the same time allowing for transport of fat and water through the membrane. Lipids are found in higher quantities in fried foods, animal fats, and dairy products like cream, butter, and cheese. These unsaturated fatty acids can help reduce inflammation, blood pressure, and triglycerides in the body. The three main types of lipids are triacylglycerols (also called triglycerides), phospholipids, and sterols. However, cholesterol also has many essential functions in the body. A fat gram is densely concentrated with energy, containing more than double the amount of energy as a gram of carbohydrate. There are two types of phospholipids Glycerophospholipids They are the major types of phospholipids, which occur in the biological membrane. This is found in adipose (fat) tissue, as well as all other organs of the body. Ahmad A, Ahsan H. Lipid-based formulations in cosmeceuticals and biopharmaceuticals. Both prokaryotes and eukaryotes possess lipids, which play many important roles biologically, such as membrane formation, protection, insulation, energy storage, cell division and more. Triglycerides are composed of a single molecule of glycerol bound to three fatty acids (Fig. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. The main biological functions of lipids include storing energy, signaling, and. Steroids 4. Slowing down to appreciate the taste and texture of foods can give your body time to send satiety signals to your brain, so you can eat enough to be satisfied without feeling overly full. Their insolubility can be attributed solely to their long hydrophobic hydrocarbon chains. (MCCCD Competency 1), Discuss the four functions of fat. Structural formula of testosterone, one of the steroid class lipids that function as the body sex hormone (created by the . Oils and fats are built from two different types of subunits: Glycerol. Describe the structure of a lipid that forms membranes. Triglycerides are the main form of lipids in the body and in foods. Their importance in the biological world is immense. They contain no fatty acids and unlike fats, are nonsaponifiable (cannot be hydrolyzed to yield soap). As a result, eating tomatoes with olive oil or salad dressing will facilitate lycopene absorption. Figure 3. They also increase the shelf life of baked goods. The chemical composition of these molecules includes hydrogen, carbon, and oxygen. Lipids: The lipids include triglycerides, phospholipids, cholesterol, and waxes. The groups are: 1. Therefore a balance of lipids is crucial to health. The results of your cholesterol test can help your provider determine your risk for cardiovascular disease, including heart attack or stroke. Dianne features science as well as writing topics on her website, jdiannedotson.com. Yuan G, Al-Shali KZ, Hegele RA. Only foods that come from animal sources contain cholesterol. Triglycerides Triglycerides, the most common, are classified as fats and oils. Unlike other body cells that can store fat in limited supplies, fat cells are specialized for fat storage and are able to expand almost indefinitely in size. In contrast, if a person who leads a sedentary lifestyle eats the same fat-rich foods, they will likely get more fat calories than their body requires. Nematodes, fruit flies, mice, and rats all live longer thanks to numerous lipid-related dietary, pharmacological, genetic, and surgical interventions. Vitamin D. National Institutes of Health, Office of Dietary Supplements. Harvard Medical School Harvard Health Publishing: How Its Made: Cholesterol Production in Your Body. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. The three main types of lipids are triacylglycerols, phospholipids, and sterols. Vitamins and Minerals Involved In Fluid And Electrolyte Balance, Introduction to Vitamins and Minerals Part 2, Calcium: Critical for Bones and Throughout the Body, Vitamin D: Important to Bone Health and Beyond, Vitamins and Minerals Involved in Energy Metabolism, Vitamins and Minerals Involved in Blood Health, Introduction to Nutrition and Physical Activity, Essential Elements and Benefits of Physical Fitness, Introduction to Nutrition Throughout the Lifecycle, Nutrition in Later Infancy and Toddlerhood. They are not stored in large quantities. Fats - These are solid at room . Glycolipids are lipids linked to carbohydrates and are part of cellular lipid pools. Eating foods that contain trans fats can lead to high levels of LDL (bad) cholesterol and can lower your HDL (good) cholesterol. The unique structure of phospholipids makes them both fat- and water-soluble, or amphiphilic. Lipids play important roles in the normal function of the body: However, lipids also serve as biomarkers of certain diseases and play some role in genetic modification and chronic disease. Simple Lipids or Homolipids Simple lipids are esters of fatty acid linked with various alcohols. Like fats but contain a glycerol and 1 fatty acid. If you're concerned about your lipid levels, talk to your healthcare provider. Lipids are considerably smaller than proteins. It also explains what happens when blood lipids are high and how healthcare providers can measure this with a lipid panel test. You might have heard about plant sterols or phytosterols. The rest of the molecule, however, is water insoluble. (MCCCD Competency 5), Identify the types of foods that contain various types of fat. Lipids are a family of organic compounds that are mostly insoluble in water, meaning they do not mix well with water. The three carbons form the backbone of the fat molecule. Triglycerides are mostly derived from your diet, and excess triglycerides are stored as fat. Quick Answer. The kinked structure of unsaturated fats yields a looser, more fluid substance at room temperature. Bement W, ed. Suberin 5. Cholesterol (and triglycerides) are transported through the bloodstream by particles consisting of lipids and proteins, called lipoproteins. Scientists continue to discover new lipids. Sterols have a very different structure from triglycerides and phospholipids. Lipids play three important roles in the body including; they function as the structural components for cell membranes, serve as energy storehouses, and work as key signaling molecules. However, many health problems are linked to excessive dietary fat intake, such as obesity, heart disease, and cancer. Lipids are classified into two types- Simple Lipids Complex Lipids Furthermore, Simple Lipids are classified as- Waxes Fatty Acids Compound lipids are classified as- Phospholipids Glycolipids Lipoprotein Simple Lipids Simple lipids are to substances that do not carry, unlike complete beds. Inflammatory skin conditions may benefit from the consumption of certain lipids such as eicosapentaenoic acid (EPA) and docsahexaenoic acid (DHA). For example, good vitamin E sources are nuts (including peanut butter and other nut butter), seeds, and plant oils such as those found in salad dressings. Hypercholesterolemia (high blood cholesterol) can be acquired or genetic. They are simple, complex, and derived lipids. Lipids are a family of organic compounds that are mostly insoluble in water, meaning they do not mix well with water. Plant sterols occur naturally in vegetable oils, nuts, seeds, and whole grains. There are five main types of lipoproteins: High-density lipoprotein (HDL) is the "good cholesterol." It carries cholesterol back to your liver to be flushed out of your body. Here are some examples of steroid lipids: Waxes Waxes are another type of naturally occurring lipid. Antiphospholipid syndrome. There are different types of fatty acids, and triglycerides can contain a mixture of them. Very hydrophobic. The rest consists of cholesterol, its esters and phospholipids. Large amounts of dietary fat are not required to meet these functions because they can synthesize most fat molecules from other organic molecules like carbohydrates and protein (except for two essential fatty acids). Lipids are a group of biological molecules that include fats, oils and some steroids. 3. Polyunsaturated Fat vs. Monounsaturated Fat: What's the Difference? Simple lipids 2. Fatty acids List and describe the role of lipids in food. Though cholesterol has a notorious reputation, the body gets only a small amount of its cholesterol through foodthe body produces most of it. (Although fried foods are usually cooked in vegetable oils, vitamin E is destroyed by high heat so that you wont find much vitamin E in french fries or onion rings. They are built from fatty acids bonded to a wide range of other compounds. The word lipid is derived from a Greek word "lipos" which means Fat. Within the body there are two types of fat - visceral and subcutaneous. We draw on the energy stored in fat to help meet our basic energy needs when were at rest and fuel our muscles for movement throughout the day, from walking to class, playing with our kids, dancing through dinner prep, or powering through a shift at work. 7.1). It also gives the body the extra padding required when engaging in physically demanding activities such as ice- or roller skating, horseback riding, or snowboarding. Molecular Biology of the Cell: Lipids in Cell Biology: How Can We Understand Them Better? 2014;25(12):1819-1823. doi:10.1091%2Fmbc.E13-09-0516. The three main types of lipids are triacylglycerols (also called triglycerides), phospholipids, and sterols. Simple lipids are esters of fatty acid linked with various alcohols. On the contrary, complex lipids are esters of fatty acids with groups other than alcohol and fatty acids. This greatly increases the risk of heart attack and stroke, with many individuals dying before reaching 50 years of age. Another example of a lipid is cholesterol. Factors that can contribute to high cholesterol include unhealthy eating habits with increased intake of processed and fried foods, lack of physical activity, and smoking. Canadian Medical Association Journal. 3) Insulate and Protect Our bodies are padded with fat, protecting us from everyday friction. The types are: 1. Simple Triglyceride Diagram by Alice Calahan is licensed under. They can be described as having a charged head and hydrocarbon tail. In animals, lipids also serve as insulation from the environment and as protection for vital organs. There are two major types of lipids- simple lipids and complex lipids. A growing body of research suggests that lipid metabolism plays a significant role in aging. Over 10,000 kinds of lipids have been discovered so far, and many work with a huge diversity of proteins for cellular metabolism and material transport. These cerebrosides are important constituents of the brain and other tissues. The narrowing of arteries due to buildup of plaque. High-density lipoprotein (HDL) refers to cholesterol that is a good fat. Sphingolipids 7. The liver and intestines make approximately 80 percent of cholesterol, whereas the rest is obtained from food. Lipids are categorized into three types including triglycerides, phospholipids, and sterols (Murphy 326). As discussed in the Carbohydrates unit, glucose is stored in the body as glycogen. Lipids form a colloidal complex and get dispersed uniformly in water in the form of minute droplets. Figure. Advances in Colloid and Interface Science. MBoC. For instance, infants and growing children require higher amounts of fat to support normal growth and development. Fish has a high oil content. It is clear that lipids, in addition to their known structural and energetic characteristics, play a role in important motor functions and signaling. Examples of saturated fats include red animal meat and fatty dairy products as well as coconut oil and palm oil. Both prokaryotes and eukaryotes possess lipids, which play many important roles biologically, such as membrane formation, protection, insulation, energy storage, cell division and more. An increased intake of lipids is associated with heart disease, obesity, cardiovascular disease, and other problems. Nutrition Through the Lifecycle - Puberty - Adolescence, 21. The liquid nature of cell membranes aids in their function. Two commonly known omega-3 fatty acids are eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) and are commonly found in fatty fish like salmon, sardines, and herring. Unit 2 - Nutrition Science and Information Literacy, Unit 3 - Molecules of Life: Photosynthesis, Digestion, and Metabolism, Unit 7- Energy Balance and Healthy Body Weight, Unit 10 Nutrition and Physical Activity, Unit 11 Nutrition Throughout the Lifespan, Alice Callahan, PhD; Heather Leonard, MEd, RDN; and Tamberly Powell, MS, RDN, Nutrition: Science and Everyday Application, v. 1.0, The Difference Between Triglycerides and Phospholipids, J. Gordon Betts, Kelly A. Two commonly discussed lipoproteins include low-density lipoprotein (LDL) and high-density lipoprotein (HDL). Lipids provide more energy per gram than carbohydrates (nine kilocalories per gram of lipids versus four kilocalories per gram of carbohydrates). But unlike the other macro biomolecules, lipids are not polymers - they aren't composed of monomers. For example, adipose tissue secretes the hormone leptin, which regulates appetite. Neutral or True Fats: In addition, some foods like margarines and dressings are fortified with plant sterols. Ceramides work as precursors for sphingolipid metabolism; active lipid metabolism occurs within the skin. Phytosterols are similar to the main sterol in humans, called cholesterol. Consider fat-free cream cheese; when fat is removed from the cream, much of the flavor is also lost. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Types of lipids. Cholesterol is made up of multiple carbon rings bonded together. Types of Lipids Lipids are mainly classified into three types. Triglycerides 2. Lipids (fats) can't move through the bloodstream on their own. Visceral fat protects vital organssuch as the heart, kidneys, and liver. High triglyceride reduction has also been found in some individuals by medical supplementation via fish oil. This chapter will learn about the three main types of lipids and their functions in our bodies. Lipids are naturally occurring (organic) compounds that are insoluble in polar solvents such as water . The main form of lipids in the body and in foods; made up of three fatty acids bonded to a glycerol backbone. Sterols are a kind of steroid. Low-density lipoprotein (LDL) is the "bad cholesterol." The fatty-acids are hydrophobic (dislike water), and the phosphate group and glycerol are hydrophilic (attracted to water). Lipids include fats, oils, steroids and waxes. 3) Sterols are the least common type of lipid. Waxes, steroids, phospholipids, and fats are the most common types of lipid groups. The outer layer interacts with water while the inner layer exists as a flexible oily substance. 3 Derived Lipids. Examples of such solvents include acetone and ether. Foods contain different proportions of fatty acid types, and this influences disease risks associated with dietary patterns. In the reproductive system, fatty acids are required for proper reproductive health; women who lack proper amounts may stop menstruating and become infertile. Figure 5.9. EPA has been shown to alter skins ceramide profile. Search for Food Sources High in Fat with MyPlate. The three main types of lipids are phospholipids, sterols (including the different types of cholesterol ), and triglycerides (which account for over 95% of lipids in food). Wax also covers hair, feathers, and wool. Actually, it is all of those extra calories we consume from food and drinks, especially from alcohol and carbohydrates, that end up stored in the form of triglycerides in our fat (adipose) tissue. Other essential nutrients, such as essential fatty acids, are constituents of the fats themselves and serve as building blocks of a cell. How its made: Cholesterol production in your body. Of the four molecules of life, lipids arguably . Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, Dietary fat and its function in your body, Foods that contain saturated and unsaturated fats, Health risks associated with too much dietary fat, Recognize the structure of lipids. How Lipids Work. In MNDs, the central nervous systems structural lipids change, and this affects both membranes and cell signaling. Fat-rich foods naturally have a high caloric density. 5.3: Lipid Types and Structures. Glycogen is quite bulky with heavy water content, thus the body cannot store too much for long. Unlike carbohydrates, which can be stored only for a short time in the body, triglycerides are stored in the body in large amounts as body fat, which can last for years. 2023 Dotdash Media, Inc. All rights reserved. Unfortunately, many of these lipid storage diseases result in illness and death at a young age. They are hydrophobic in nature because of the predominance of hydrocarbon chains (-CH2-CH2-CH2-CH2-) in their structures. Like phospholipids, cholesterol is present in all body cells as it is an important substance in cell membrane structure. Here are a few important jobs that hormones have: Lipids are essential for your health. The structure of a triglyceride is often depicted as a simplified drawing of the glycerol backbone and three fatty acids. Omega-3 fatty acids: Fact sheet for consumers. Body fat is a reservoir of chemical energy. Fat provides energy and depending on the classification of lipids, it plays an important role in metabolism. The subtypes include Phospholipids, Chromolipids, Glycolipids and Aminolipids. The phospholipid bilayer consists of two adjacent sheets of phospholipids, arranged tail to tail. Phospholipids 6. Trans-fats are partially hydrogenated plan oils that resemble saturated fats. Identify the following images below as a food high in saturated or unsaturated fat by dragging the images to their correct box. Polyunsaturated fatty acids (PUFAs) are lipids that aid in membrane fluidity. Legal. The reason lipids are hydrophobic is that their molecules have long hydrocarbon chains with 16 to 18 carbon atoms. More than 95 percent of lipids in the diet are in the form of triglycerides, some having a visible presence and some hidden in foods. It pads our hands and buttocks and prevents friction, as these areas frequently come in contact with hard surfaces. Triacylglycerols also help the body produce and regulate hormones. Vitamin K promotes bone health. Unsaturated fats have essential nutrients commonly knowns as omega-3 fatty acids and are found in foods like tuna, salmon, nuts, seeds, avocados, and leafy vegetables. Compare the structure and function of different types of lipids: triglycerides, phospholipids, steroids, and saturated and unsaturated fatty acids. Classification (Types) of Lipids 1. Other individuals with high-energy needs are athletes, people who have physically demanding jobs, and those recuperating from illness. This chain is water-insoluble. Fat plays another valuable role in nutrition. They might also want you to have the test if you are at risk for cardiovascular disease. Lipids perform various functions in the human body. Fat also adds texture to food and helps keep baked foods moist. The three of types of Lipids are: 1. National Institutes of Health, Office of Dietary Supplements. There appears to be a link between nutrition (in this case, not enough lipid calories consumed) and risk for developing ALS. Unlike other body cells that can store fat in limited supplies, fat cells are specialized for fat storage and can expand almost indefinitely in size. Verywell Health's content is for informational and educational purposes only. Lipids are one of the major macromolecules present in our body, and others include nucleic acids, carbohydrates, and proteins.
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