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Carbohydrates are one of the most consumed macronutrients, which are vital for the body. Macronutrients are substances that you need in major amounts, which provide energy and allow you to survive and develop. In addition to carbohydrates, proteins and fats should be components of your diet in order to allow your body to thrive. Read on to learn more about carbohydrates, the role of carbs in the body types of carbs, best sources of carbs, and how many carbs you should eat.

What Are Carbohydrates?

Simply put, a carbohydrate is a macronutrient with carbon, hydrogen and oxygen – any compound with the formula Cm (H2O)n. Since carbohydrates are sugar molecules, they get broken down into glucose (blood sugar) and become an immediate energy source that cells can use. They are the primary energy source for the body. As a result,  glucose can be used immediately or stored in the liver and muscles for later use. Carbs provide as much energy density as proteins (4 kcal per gram) and less than fats (9 kcal per gram). 

Whether you’re having breakfast, a post-workout meal, or just a quick snack between your meals, carbohydrates are an easy option for anyone. A piece of toast, a bowl of rice, even fruits and vegetables have a great amount of carbs. However, not all carbs are the same. While some carbs offer a way to keep you full and satisfied for long, other carbs digest and energize you quickly but leave you hungry soon after consuming them.

The Role of Carbs in the Body

These are multifaceted compounds that have multiple and diverse roles:

  • Energy Production: The main function of carbohydrates is to provide energy to the body. When carbs are broken down into glucose and enter the bloodstream, they are taken up into your cells to produce a fuel molecule called adenosine triphosphate (ATP). ATP is used to power metabolic processes. 
  • Energy Storage: After glucose is used for immediate tasks, your body stores excess glucose for later use as glycogen. The liver stores approximately 100 grams of glycogen and muscles can contain approximately 500 grams of glycogen. Liver glycogen can be released into the bloodstream to energize the body and help maintain normal blood sugar levels between meals. Muscle glycogen can only be used by muscle cells to assist during long periods of high-intensity exercise.
  • Digestive Health: Fiber helps maintain healthy digestion and is divided into soluble and insoluble fiber. Soluble fiber (oats, legumes, fruits and vegetables) draws in water and forms a gel-like substance while passing through the body, which increases the stool’s bulk of your stool, softens it, and facilitates bowel movements. Insoluble fiber (whole grains) adds bulk to your stools and increases bowel frequency.
  • Cardiovascular Health: Carbs high in fiber help lower “bad” LDL cholesterol and decrease the risk of heart disease. Fiber binds to bile acids and prevent them from being reabsorbed. Then, the liver uses cholesterol to make more bile, which otherwise would be in the blood.
  • Healthy Blood Sugar: Fiber delays carb absorption in the digestive tract, helping lower blood sugar levels post-meals.

Types of Carbohydrates?

Carbohydrates: Understanding Complex and Simple Carbs

Not all carbs are created equal. Understanding this powerful macronutrient can help you make better choices and instill changes to your health and fitness level.  Carbohydrates are classified according to their degree of polymerization (number of macromolecules) and are divided into sugars, oligosaccharides and polysaccharides or sugars, fibers, and starches.

Simple Carbs

Simple carbs (monosaccharides and disaccharides) are made of sugars and consist of shorter molecules that digest quicker than complex carbohydrates. Because of their shorter chains, they spike blood glucose and produces short-lasting spurts of energy. However, alertness reduces and fatigue increases after 30 to 60 minutes of consuming them.

The following are some examples of simple carbs:

  • Sugar, brown sugar, invert sugar
  • Sucrose
  • Candy
  • Sugar drinks and sodas
  • Syrup, high-fructose corn syrup, malt syrup, corn syrup
  • Table sugar
  • Fruit juice concentrate
  • Sugary snacks
  • Pastries
  • Desserts
  • Corn sweetener
  • Dextrose
  • Fruit juice concentrate
  • Fructose
  • Honey
  • Lactose
  • Maltose
  • Molasses

Complex Carbs

Complex carbohydrates are polysaccharides (or oligosaccharides) and contain longer chains of sugar molecules. When it comes to complex carbs, they take longer to break down in the stomach and digest. They have less impact on blood sugar levels and are a more sustainable energy source.

  • Starches: These complex carbs are made of lots of simple sugars strung together. Your body needs to break starches down into sugars to use them for energy. Starches include bread, cereal, potatoes, grains, and pasta. They also include certain vegetables, like potatoes, peas, pumpkin, corn, winter squash, green peas.
  • Fiber: This complex carbohydrate but your body cannot break it down so easily. Carbs high in fiber can help you feel full longer and provide other health benefits. They can help prevent digestive problems, such as constipation, and lower cholesterol and blood sugar. Just make sure you check your carbohydrates to reduce the chance of contracting E. coli. Fiber is found in fruits, vegetables, legumes, and whole grains.

Best Carb Sources to Consume

There is no need to avoid carbs – your body needs them. You just need to choose the right carbohydrates to eat, and eat them in the right amounts. You should try to avoid the regular consumption of simple carbs such as sugary drinks, sodas, fruit juices, baking goods. At the same time, you should replace white flour products (white pasta, bread) and refined grain alternatives for whole grain or legume-made options.

As a general rule, you should try to consume complex carbs with your meals. They are moderate in calories, high in nutrients and natural fibers, low in sodium, and don’t have trans-fats or refined sugars. The following are some examples of complex carbohydrates to eat:

  • Whole Grains: brown rice, wild rice, oatmeal, whole barley
  • Grain-Like Foods: quinoa and buckwheat
  • Starchy Vegetables: potatoes, sweet potatoes, and corn
  • Non-Starchy Vegetables: asparagus and zucchini
  • Legumes: beans, lentils, kidney beans, and chickpeas

How Many Carbs Do You Need?

Your carb intake depends on numerous factors, such as your age, sex, activity level, health, and goals. If you want to calculate your carb needs according to your biometrics and individual needs, check out a carb calculator. As a general rule, the Institute of Medicine recommends that you consume at least 130 grams of carbohydrates daily. Other sources recommended that carbohydrates encompass 45% to 65% of your daily calories, which equates to 225 to 325 grams of carbs if you eat 2,000 calories a day.

Studies show that low carb diets have numerous benefits. These diets help induce rapid fat loss, creating big changes aesthetically. Low carb diets help reduce appetite, leading people to eat fewer calories. Additionally, they can help lower blood sugar, blood pressure, and LDL (bad) cholesterol.

  • Eating a low-carbohydrate diet (less than 26% carbohydrates or less than 130 gm/day) works for people who want to be leaner, active, while staying healthy.
  • Eating a very low-carbohydrate diet (less than 10% carbohydrates or less than 50 gm/day) works for those with fat loss goals and people who want to experience bigger metabolic effects. Since eating less than 50 grams of carbs per day allows your body to go into ketosis, the body’s energy is provided by ketone bodies, not carbs. This, not only, helps to lose body fat but to regulate blood sugar, improve glycemic control, and markers of cardiometabolic risk factors.

One thing to keep in mind is that when you don’t consume a sufficient amount of carbs, fats are used for energy. However, if there are not enough of calories being consumed, your body breaks down protein instead. This can lead to a catabolic state where the body eats it’s own muscle.

The Glycemic Index

We couldn’t talk about carbohydrates without mentioning the glycemic Index (GI). This is a scale that gives a number to carbohydrates, indicating how quickly a food causes a person’s blood sugar to rise. Foods high on the glycemic index can cause harmful blood sugar spikes and make it more challenging to maintain a healthy weight.

The GI scores are as follows:

  • low GI foods: 55 or less
  • medium GI foods: 56–69
  • high GI foods: 70 or above

The Glycemic Index Foundation recommends that you aim for an average dietary GI score of 45. You don’t have to only eat foods with a GI score of 45 or lower but balance the intake of higher GI foods by eating foods with a lower GI. However, if you have blood sugar problems, you should try to eat foods with low glycemic index and avoid high GI foods.

You should also keep in mind several factors that can affect the GI:

  • Cooking: Cooking foods for longer periods tends to raise GI – For instance, pasta cooked al dente has a lower GI than cooking it to the point of softness.
  • Processing: Processing foods also raises GI – For example, commercial fruit juice has a higher GI than a whole fruit or a raw fresh juice.
  • Ripping: Riper foods usually have a higher GI – A banana, for example, has a lower GI than a ripen banana.
  • Pairing: Certain foods can affect GI – Fiber lowers the total GI of a meal.


As you can see carbohydrates don’t have to be demonized. You don’t have to eat a super restrictive carb. When you eat a macronutrient in excess, whether is carbs, fats or proteins, your body stores them as fat. Carbs are not the enemy; they provide several functions that can help you accomplish your goals. At the end of the day, it’s essential to create an appropriate balance between the differing carbohydrates. A simple measure is consuming more complex carbohydrates regularly since they keep you fuller longer, give you longer-lasting energy, and fewer cravings. You can consume simple carbs occasionally. As long as you try to remain balanced, you will positively influence your aesthetics, your health, and experience results.

To a Fitter Healthier You,

Adriana Albritton

The Fitness Wellness Mentor

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