Is Food A Source Of Energy_What’s The Energy Value Of Food?


We eat to live. The human body is neither less than a machine. And this machine needs to fuel its tank properly with energy to keep it running. That’s why we eat. Is food a source of energy? Of course, there is no doubt about the energy values of food which we are intaking in our daily lives.

Is Food A Source Of Energy

Here in this article, you can easily find out more about how food ingredients supply your body a wide range of energy, the energy values of food, and how is food  a source of energy. 


Read through the end, and let’s cherish your quest of knowing.. 


Why Is Food A Source Of Energy? 

Concept Of Energy 

Energy is something that provides the ability to do work. There are various types of points as potential energy, kinetic energy, and so on. And there are multiple sources of energy around the world. We found energy from food also.

Food As An Energy Source 

Is Food A Source Of Energy

Think about a time that you felt hungry. Your body felt weak. A human body can not survive more than 40 days without the consumption of food. Why? 

We all know about the nutrients found in food provide energy through our body cells. The source of energy in most food chains on earth starts with the sun.


The energy held in food has functioned as chemical energy. 


The chemical energy stored in food is similar to potential energy. And that energy transforms into kinetic energy when we digest food. That means food is a complete source of energy. Our body cells use food energy to perform essential life functions, like building new cells and repairing. Pump the heart, respiratory work, and so on. 

Concept Of Food Energy 

Food energy is defined as the energy release from carbohydrates, fats, proteins, and other organic compounds. These major cariogenic nutrients are burnt entirely with oxygen and finally release energy or food calories.  The energy released by a particular food is a critical parameter in nutrition.Is Food A Source Of Energy

Food Energy In Biology 

In biology, food energy is often stored by cells as biomolecules like carbohydrates and lipids. Energy is released when these molecules get oxidation during cellular respiration. Then released energy gets carried and transported by ATP. And this is how we get energy from food. 

Energy Value Of  Food 

Energy has traditionally been expressed as calories or kilocalories. Most recently, the unit of energy has been changed in kilojoules. The energy value of food for each macronutrient gets modified by the Atwater factor. For example, have a look at this chart. 

    Kilojoule per gram       Kilocalorie per gram











In this chart’s energy value of food are calculated from macronutrient composition and the modified Atwater factors for these macronutrients. 


What Are Nutrients? 

Is Food A Source Of EnergyThe food contains nourishing properties called nutrients. Defined nutrients are chemicals found in food that helps the body to survive. Many types of nutrients have been identified (energy-giving nutrients, protective nutrients, and bodybuilding nutrients).And this  primarily the energy value of food which provide us energy. From them, energy-giving nutrients are carbohydrates, fats, and protein. In this unit, we will know mainly about those energy-giving nutrients and foods which provide them. 


Carbohydrate is one of the nutrients that provide energy. They are our bodies’ most important fuel. Sugar and starches are 

main two types of carbohydrates. Starches are a complex type of carbohydrate found in rice, potatoes, pasta, corn, etc. And simple sugar contains glucose absorbed quickly for energy—for example., fruit, honey, milk, and milk products. 


Carbohydrates provide four calories per gram, and they are the primary source of energy for the body. According to the Dietary Guidelines for Americans 2010, carbohydrates should provide 45 to 65 percent of your total calories, which means you should get 225 to 325 grams of carbohydrates per day on a 2,000-calorie diet. Nutrient-dense high-carb foods include whole grains, such as whole-wheat bread, oatmeal, barley, legumes, beans, peas, and lentils. Low-fat milk and dairy products, fruit, and starchy vegetables, such as sweet potatoes, also contain carbohydrates. Sugary foods and refined grains, such as white bread, are high in carbohydrates, but they’re  less nutritious.



Fats are a primary source of energy and a natural macronutrient. Oils used in our cooking is a form of fat. We find fat in fish, meat, dairy, poultry, avocado, nuts, and olives.



Is Food A Source Of Energy

Protein provides calories. It builds and repairs our body structure, produces body chemicals like amino acids, carries nutrients to the cells, and regulates body processes. Protein can be found in eggs, meat, fish, dairy, poultry, lentils, etc. 


Protein can be a source of dietary energy if adequate calories are not consumed or if the protein is consumed in excess beyond muscle and tissue needs.

 Other Food nutrients 

Food contains some other nutrition materials such as fiber, minerals, and vitamins. They have specific jobs to do. Energy obtained from food is used to maintain metabolism. 


Frequently Asked Questions 

Q: Is food a source of energy? 

A: Yes, food is one of the primary sources that contain energy. 

Q: What is energy value of food?

A: primary food macronutrients containing calories are energy value of food.

Q: Which are the primary food micronutrients? 

A: Carbohydrates, proteins, and fat. 

Q: How do we generate energy from food? 

A: We digest food, and by cellular respiration, we obtain energy from food.Is Food A Source Of Energy

The Bottom line

An abundant variety of foods can boost our energy. 

Whether packed with carbs for readily available energy, or fiber and protein for a slower release of energy, these foods can increase your power and stamina. 

Additionally, many of these foods contain significant amounts of other nutrients, including vitamins, minerals, and antioxidants. And this whole thing indicates why is food a source of energy. 

Author : Milika Islam

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