Let’s face it! The concept of micro and macro-nutrients can be a daunting and often times a confusing topic. However, while this may be the case, believe it or not, we are actually familiar with the constituents of the concept. Why? Well, we aware of vitamins, minerals and some, the terminology – macro-nutrients even if we are not able to give an in-depth analysis of their functions and sources. Nevertheless, we have been consuming these nutrients over the course of our lifespan, hence the very reason for being alive and ‘kicking’ at this very moment. As such, the main aim of this article is to breakdown the concepts in ways that will aid in your understanding, so that, going forward, we are able to confidently apply these nutrients to our overall health routine and in so doing, create an even healthier version of ourselves . So, here we go!
Our bodies cannot survive without nutrients. As such, we have to ensure that we feed our cells with the adequate and right foods so that it can strive and function optimally. The nutrients that our bodies yearn are found in the various foods that we eat on a daily basis. These nutrients can be divided into two (2) broad categories – Micro-nutrients and Macro-nutrients. Micro-nutrients are our vitamins and minerals which the body requires in small and in some instances larger amounts especially in the case of macro-minerals. Meanwhile, Macro-nutrients are our Carbohydrates, Fats and Proteins which the body requires in larger amounts. Here is a pictorial illustration of the breakdown of nutrients below:
A Healthy Note
While water is not considered an essential nutrient by some researchers, others agree that it is an essential component of the human diet. Without water, none of the nutrients would be able to function optimally. As such, water provides the biological functions of the body such as providing the body with structure, provide the fluid necessary for cell metabolism as well as regulating the temperature of the body. Therefore, while the body can survive for up to five (5) weeks without the macronutrients of carbohydrates, protein and fat, it can only survive five (5) days without water.
Micro-nutrients are our vitamins and minerals which is available via our diet as well as by supplementation. Further, ‘micro’ equates small, as such, our bodies only require micro-nutrients in small amounts while macro-nutrients are usually required in larger amounts. Needless to say, micro-nutrients are critical to the body in ensuring normal metabolism, growth, physical and mental well-being. Here is a breakdown of micro-nutrients.
These are the micro-nutrients that are essential in small quantities for the health and development of our body’s. Vitamins can be ‘fat-soluble’ or ‘water-soluble.’ Fat-soluble vitamins are our vitamin A, D, E & K which carry out a plethora of functions ranging from keeping our bones strong to helping our muscles to perform properly. In addition, these vitamins are stored in the body’s tissues if they are consumed in abundance which can lead to toxicity, especially in the case of vitamin A. On the other hand, water-soluble vitamins are our B-vitamins such as Thiamin (B1), Riboflavin (B2), Niacin (B3), Pantothenic Acid (B5), Pyridoxine (B6) Biotin (B7), Folate (B9) and cobalamin (B12) as well as Ascorbic Acid (vitamin C). These vitamins support the body’s blood vessels as well as strengthening of the immune system. Unlike fat-soluble vitamins, water-soluble vitamins, with the exception of vitamin B12, are not stored in the body if consumed in excess but is excreted through the urine, sweat or bowels. Therefore, these vitamins must be consumed on a daily basis so as to ensure that the body is adequately replenished. For a more in-depth discussion on vitamins, please visit this article.
Minerals are also considered a micro-nutrient like vitamins and are also essential in small quantities by the body. Minerals are further broken down into two (2) categories, macro-minerals and micro-minerals (trace minerals). Examples of macro-minerals that are vital to our bodies include calcium, potassium, iron, sodium and magnesium. Macro-minerals are termed as such as they are required in greater amounts than its counterpart – micro-minerals. Micro-minerals comprise such minerals like copper, zinc, chromium, selenium and iodine. In general, minerals are essential for the optimal functioning of the body, especially the enzymatic ones (digestion and metabolism). According to research, about 4% of body mass consists of minerals. Please see this article for a more detailed discussion on minerals.
While most of us may be more familiar with the term ‘micro-nutrients’ which are our vitamins and minerals as discussed above. The concept of macro-nutrients is often perceived to be more complex or a scientific phenomenon. However, macro-nutrients are simply our carbohydrates, protein and fat. These nutrients are required in larger amounts to fuel the body. This fuel is ‘energy’ which is measured in calories and is needed by the body for growth, repair, tissue development as well as nerve health. Notwithstanding its seemingly complex nature, we can easily create a healthy diet by simply knowing the macronutrients that comprises our foods, especially the common ones. Take for example, Broccoli, According to research, 1 cup contains about 5% or 11.20 gram of carbohydrates, 7% or 3.71 grams of protein, while almonds contain 70% fat, 15% protein and 15% carbohydrates. Further, 1 cup of plain steamed Callaloo, which is one of Jamaica’s staple breakfasts favourite, contains zero fat, 3 grams of protein, 5 grams of carbohydrates and around 4 grams of fiber, all in all, a healthy way to start any sunny or rainy day. As such, the concept of macro-nutrients can become less daunting if we know the breakdown of macro-nutrients of foods, especially our favourite ones. Now, let’s take a more detailed look at these major nutrients.
Carbohydrates are considered the first major source of fuel to the body as it provides the body with 4 kilocalories per gram. Carbohydrates exist in the form of sugar, starch and fiber and are categorized in two (2) basic forms – simple and complex carbohydrates. Simple carbohydrates represent the various forms of sugars such as fructose (the sugar commonly found in fruits), sucrose (table sugar), lactose (the sugar found in milk) and finally glucose, or dextrose which is found in fruits and honey. Glucose is the major free flow sugar that circulates in the blood and is thus referred to as ‘blood sugar.’ As such, insulin, which is the hormone that prompts the cells to absorb blood sugar for energy or storage, moves glucose from the blood into the cells for energy. Further, glucose is one of the only sugars that provide energy to the brain. When glucose is eaten in excess, it is stored in the liver as glycogen, our body’s energy reservoir and is then broken back down into glucose when needed by the body. Most importantly, simple carbohydrates are easily metabolized by the body and can cause blood sugar spikes. Blood sugar spikes occur when your blood sugar rises and then falls sharply after you eat. This type of rise and fall can result in lethargy, hunger and overeating which can then lead to weight gain in the short-term, but overtime, can lead to type 2 Diabetes due the body’s inability to effectively lower blood sugar. In addition, blood sugar spikes can also cause your blood vessels to harden as well as narrows which can lead to heart attack or stroke. On the other hand, Complex carbohydrates are not easily metabolized by the body and thus take a longer time to be digested and absorbed into the blood stream so as to produced energy. These include starch found in the form of grains, legumes, tubers as well as fiber which is a form of carbohydrate that cannot be digested by the body, but is crucial to our health. Other examples of complex carbohydrate include lentils, chickpeas, kidney beans, whole grains, oatmeal, quinoa and vegetables such as asparagus, cucumbers and broccoli. Therefore, eating carbohydrate rich foods are important in ensuring that the body has what it needs to function at its peak. However, it is important that we consume a diet that comprises more complex carbohydrates so as to keep the body fuel for extended periods of time.
Protein is the main structural component of all the body’s cells. It is made up of units called ‘amino acids’ which are made up of nitrogen. Nitrogen is a naturally occurring element that is responsible for growth and reproduction both in plants and animals. Protein provides the body with 4 kilocalories per gram and helps to regulate the body’s processes and can be used to provide energy for the body. However, the body’s preferred choices of energy metabolism are carbohydrates and lipids (fats). Protein contains over twenty (20) different amino acids, with only nine (9) considered as essential, which means that the body cannot manufacture these naturally. As such, we have to ensure that these essential amino acids are included in our everyday food choices. The essential amino acids are – histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Histidine is required for the health of our brains and nerves and can be found in (poultry, beans and buckwheat), Isoleucine, is an isolate form of leucine that helps the body to produce haemoglobin and is found in (eggs, cashew and chia seeds), Leucine helps to stimulate muscle strength and growth and is prominent in foods such as (chicken, pumpkin and tuna), Lysine is required for muscle repair and growth and is plentiful in foods such as (eggs, poultry and almond), Methionine, is responsible for the growth of new blood vessels and muscle growth and can be found in these foods (fish, onion and cacao), Phenylalanine is converted to tyrosine, which is required to make protein and brain chemicals and is found in such goodies like (avocados, peanuts and quinoa), Threonine supports the immune system and the liver and is found in (hemp seeds, figs and leafy greens), Tryptophan is converted to serotonin, which is the chemical that is responsible for unearthing the feelings of happiness and stress reduction. This amino acid can be found in (chocolate, chickpeas and turkey meat) and lastly, the amino acid – Valine. Valine is needed by the body for muscle growth and repair and is found in (spinach, broccoli and blueberries).
It is important to note that protein is divided into two (2) categories – Complete and Incomplete. Complete proteins are so called because they contained all of the nine (9) essential amino acids. Complete proteins foods include eggs, chicken and hemp seeds. Incomplete protein are foods that do not contain all or enough of the nine (9) essential amino acids and include nuts, rice, pasta, yams and most beans.
As you can see, protein plays a vital role in our body from muscle building and repair to regeneration of our cells. It is more so important for physical activity to aid in tissue repair. In physical activity, the muscle tissue is constantly being broken down, as such, proteins helps to maintain the structural integrity of the body’s tissues. Protein also helps with hormone production as well as with the critical enzymes used in the process of digestion.
Fats, or better yet, lipids as it is known scientifically, is a group of fatty substances which include triglycerides, (which are a major form of lipids and provide the body with energy as well as serves as a storage reservoir for fat) and cholesterol. These fatty substances are soluble in fat and not water as in the case of our B-Vitamins and Vitamin C. Fat provides a great source of energy and structure to the body’s cells and is found in such foods as – avocados, dark chocolate and fatty fish. In addition, fats have the highest caloric content (9 kilocalories per gram). Therefore, they provide the body with the highest amount of energy when burnt. Each gram of fat, whichever the source be it butter or a spoonful of peanut butter provides the body with 9 kilocalories per gram. As such, fats are considered twice as energy-rich as both carbohydrates and protein. It is recommended that at least 20-35% of our daily calorie intake should come from fats. In spite of the criticism that fats have endured over the years, dietary fats are very important as they help the body to absorb the essential micro-nutrients such as Vitamin A, D, E and K. Fats also help to insulate and keep us warm and help us to endure those growling exercise sessions. In addition, fats provide our body’s with the essential fatty acids such as linoleic and linolenic acid. Linoleic and linolenic acids are considered “essential” because our body cannot make them on its own or work without them. Our body needs these essential nutrients for brain development, controlling inflammation, and blood clotting. You can read more about fats in this article.
Here is a summary of the list of macro-nutrients, their benefits, food sources as well as the recommended daily allowances.
Let’s Sum It Up!
Our foods are compact with nutrients, from a little cherry to a gigantic cantaloupe. These nutrients are in two (2) forms – Micro-nutrients and Macro-nutrients. Micro-nutrients are simply our vitamins and minerals such as Vitamin A, D, E, Thiamin, calcium, potassium, nutrients which are required for optimal health and well-being. On the other hand, Macro-nutrients, which are categorized as ‘energy-yielding nutrients are required by the body for growth and sustained energy and include such nutrients as carbohydrates, fats and proteins. Carbohydrates are our sugars and fibers which are required by the body for fuel while protein is the building blocks of cells and fats for growth and energy. While these nutrients are critical to our health, we must ensure that we consume them in proportionate amounts based on our lifestyle and activity levels. Unlike micro-nutrients which can lead to toxicity or other health issues if consumed in large amounts, macro-nutrients, when consumed in excess are stored in the body as fat which can then be used as fuel. Nonetheless, excess fat, especially those of the saturated kind, can lead to artery clogging, heart disease, strokes and that ‘tire around’ the waist that requires months, or even years of hardcore exercise to be transformed into a six-pack. So, let us keep it balance, remembering that moderation is a virtue that must be practice in all sphere of life, and our diet is no exception.
- All about Protein Foods Group (2017, Aug 29). Retrieved July 7, 2018 from https://www.choosemyplate.gov/protein-foods.
- Feldman M, et al. (2016). Digestion and absorption of dietary fat, carbohydrate, and protein. In: Sleisenger and Fordtran’s Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 10th ed. Philadelphia, Pa.: Saunders Elsevier.
- National Library of Medicine (U.S.). (2018, July 7). Carbohydrates: How carbs fit into a healthy diet.https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/carbohydrates/art-20045705?p=1.