Food is any material consumed in order to supply nutrition to an organism. It can be made of any material, including vegetable, fruit, grain, dairy products, meat, fish, poultry, and other foods. Food is also commonly of animal, plant or fungus origin, and has vital nutrients, including proteins, vitamins, carbohydrates, and minerals. All living beings require food to live. It is used as fuel, because it is an excellent source of energy which enables life to function normally.


The nutritional value of food directly depends upon the type of food, the nutrients it contains, and the proportions in which they are consumed by the body. A diet should comprise a combination of different macronutrients, which are essential for the energy requirements of the human body. Macronutrients are substances that are needed in a balanced diet. They include vitamins, minerals, and carbohydrates. The three main food groups are protein, vegetables, and carbohydrates.

Proteins are major elements of food. These include amino acids and carbohydrates. Amino acids are chemical compounds that can be either created in the body from other resources or synthesized through the breakdown of simpler compounds. Some of the most important types of proteins are fats, oils, cholesterol, fruits, vegetables, grains, legumes, eggs, dairy products, and protein powder. These nutrients are collectively called macronutrients.

Vegetable and animal sources of protein are used in order to create diets rich in macronutrients. These include fish, milk, eggs, poultry, cattle, nuts, seeds, and bones. Milk is the most widely consumed source of protein in the world. However, the consumption of milk may be limited because of animal sources’ contamination, especially in countries where cow’s milk is illegal. Eggs are another important food, which may be consumed in eggs as an added dietary fiber or as a source of protein.

Fruits, vegetables, and whole grains constitute the richest diet on the planet. These foods are also the richest source of micronutrients and antioxidants. Micronutrients are necessary for the healthy functioning of the body. Antioxidants help fight disease and illness by neutralizing free radicals, which are caused by exposure to external factors such as radiation and air pollution.

A balanced diet is the way to maintain a healthy body. Eating the right food helps maintain weight and prevent many diseases. Some food groups are more important than others. Fats, oils, and cholesterol are the three main categories of fats consumed by humans. Carbohydrates are the main source of calories in food. Animal sources of protein and vitamins are the three primary sources of carbohydrates.