Classes of food with examples and functions

Classes of food with examples and functions

We are what we eat. That is why it is important to eat healthily, and lucky for us, science can help us with this. Did you know that the food that we eat can be divided into groups based on the nutritional properties they offer? Read on to find out how many classes of food exist, their functions, and sources.

Classes of food

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The vast number of dishes today create different food classes that are very difficult to organize. However, it is possible to classify them. The science of dietology develops every day, and its data can be used to figure out what we eat and why. This guide has the classes of food with examples to help you keep a balanced diet.

What are the classes of food and their sources?

There are seven major classes of food based on their nutrient properties:

  • Carbohydrates - These are energy-giving nutrients found in potatoes, rice, wheat, maize, and other starches.
  • Proteins - These are bodybuilding nutrients found in meat, legumes and dairy products.
  • Fats - These are found in nuts and fruits like avocados.
  • Fiber - These are necessary for digestion and are found in fruits and vegetables.
  • Minerals - These are necessary for improving bodily functions and are found in most foods, fruits, and vegetables
  • Vitamins - These boost immunity and are found in fruits and vegetables.
  • Water - This is used in the creation of bodily fluids and is found in fruits, juices, and other liquids.
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classes of food with pictures

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7 classes of food and their functions

The classification of food is based on macronutrients and micronutrients. Macronutrients usually include water, fiber, fats, proteins, and carbohydrates. They are needed for our body in large quantities.

Micronutrients include vitamins and minerals. They are needed in our bodies in much fewer quantities. Macronutrients provide the body with the energy to live and prosper.

Some of these nutrients are needed for the body all the time as they provide constant energy. People’s health deteriorates because of the imbalance of the nutrients. There can also be a deficiency and an abundance of nutrients in our body. Here is a breakdown of the classes of food with pictures.

1. Carbohydrates

Classes of food with examples

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Carbohydrate molecules are made up of hydrogen atoms, oxygen, and carbon. They can be classified according to the number of monomer units in them. Therefore, they can be divided into polysaccharides, monosaccharides, and disaccharides. Carbohydrates can be found in rice, noodles, bread, pasta, and other products that have grains.

What is the classification of food groups and why do you need it?

Polysaccharides are more complex than any other saccharides, and they take much more time to digest. Only the simplest sugar units of classes of food can be absorbed by the blood. The simple carbs can be consumed by blood very quickly. Nevertheless, it may cause a sugar level to raise abnormally which leads to vascular and heart diseases.

2. Protein

classes of food and their functions

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Protein molecules are largely made of hydrogen, oxygen and hydrogen, carbon, and nitrogen. This Nitrogen is an essential part of amino acids that are needed for our body. The functions of food with proteins include building cells, maintaining muscles, and improving metabolism.

Our body structure is mostly made up of protein. Every molecule of protein is made up of thousands of amino acids. Our body needs these elements to create new protein and maintain the existing one.

Protein that can be produced in our body is called non-essential protein, while protein that can’t be produced there is called non-essential. All animals needed essential proteins to survive. This nutrient is found in beans, dairy products, fish, meat, eggs, and so on.

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3. Fats

functions of food

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One molecule of fat is usually made of several fatty acids. These fatty acids are made of long chains of carbon and hydrogen atoms. All fats can be divided into unsaturated and saturated. Saturated fats are the ones where all carbon atoms are bonded to hydrogen atoms. Unsaturated fats are the ones where carbon is usually connected with double bonds with a few molecules of hydrogen.

Fats are used to regulating energy, be a source of energy, help with temperature regulation and vitamin absorption. Fats exist in various foods, like dairy products, meat, fish, whole eggs, vegetables, nuts, and so on.

4. Fiber

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Fiber is defined as a type of carbohydrate that is not totally absorbed by human beings. Fiber in the diet is usually made up of cellulose. It’s a large carbohydrate that can’t be digested by our body because of the lack of enzymes. Fiber can be found in fruits (oranges, currants, pears), vegetables (onion, corn, broccoli, garlic, green bean), pulses (beans, lentils), and whole grains (cereals).

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Fiber is needed to keep our digestive system healthy and ready to do its job. It also contributes to the processes, like stabilizing cholesterol and glucose levels. The diet which is rich in fiber can prevent coronary heart diseases, bowel cancer, and diabetes.

5. Minerals

classification of food

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Minerals can be defined as chemical elements that are needed by living things. Elements are less needed for our body, but they are also an essential part that keeps us healthy. The minerals include Calcium, Iron, Magnesium, Potassium, Zinc, and so on. You can find these minerals in dairy products, meat, fish, poultry, grains, and so on.

Minerals represent various functions like building blocks for our muscles, bones, and teeth, carrying oxygen in our body, keep fluids balanced.

6. Vitamins

classes of food

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Vitamins are another nutrient that is not needed in large quantities but plays an essential role in our body. Examples of vitamins include Thiamine, Riboflavin, niacin, Pantothenic acid, Biotin, Pyridoxine, Folic acid, Cobalamin, Ascorbic acid, and so on. Vitamins are an essential part of our immune system as it helps us to regulate and maintain the healthy process of our body. They can be found in almost any product on the Earth.

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7. Water

classification of food

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Water is an essential part of our food. Human is essentially 80% water. Therefore, we need to keep that balance to survive and stay healthy. Fortunately, water can be found in any product. It is a simple combination of hydrogen and oxygen, but we cannot survive without this.


How many classes of food do we have? Now you know all seven classes of food without which we can’t survive. Do not forget that healthy eating leads to long living. It is essential that you consume all necessary elements to help your body survive in this harsh world. Combining and balancing these basic elements of healthy nutrition like fat, carbohydrate, water, and so on will help you with this.


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