FoodThe Body

Food and How the Body Digests It

Food is a substance that we eat to provide nutritional support for our body. Usually animal, plant, or fungal, food contains essential nutrients that our bodies require to stay healthy. These substances are known as macronutrients. They are also called dietary supplements. They are the main sources of calories and energy for humans. The purpose of eating is to get the energy and nutrition our bodies need. However, food can be a bit confusing. Here are some definitions of the different types of food.


The quest for sufficient food is one of the oldest human activities. Early ancestors lived as hunter-gatherers, hunting, and gathering plants. They occasionally hunted and killed animals for food. Their diets consisted of about 35-percent meat and 65 percent plant food, with little to no cereal grains. Their diets were low in fat, high in dietary fiber, calcium, and vitamin C. The process of making and storing food at room temperature has been known to have a long shelf life, and the human body can easily absorb the nutrients.

Types of digestion

When the body digests food, it uses two types of digestion. The first type is mechanical digestion, which breaks down the food into smaller pieces. The second type is the chemical digestion, which utilizes enzymes to break food down into smaller molecules. The enzymes in the first type break the food down into simple sugars. This method is more efficient than the second one. The process of mechanical digestion is also known as fermentation. The bacteria in the intestinal flora to help the body absorb nutrients and eliminate waste.


While energy is captured from food and stored in the body, the conversion process is not complete and not all of the combustible energy is metabolized into ATP. Some of it is used for intermediary metabolism, or in the production of amino acids and lactic acid. This means that not all the combustible energy in food is used for ATP production. During this process, the body loses some of the food’s energy in the form of fecal matter.

The energy content

The energy content of foods is measured using energy conversion factors. They are derived from the calorie content of the food. The two systems are complementary in that they measure the same quantity of energy in food. The ME is the amount of energy a food can absorb when digested. They are also the primary source of energy in a plant. The former contains glucose, while the latter contains fructose. The two types of carbohydrates are used to produce proteins.

Sources of food

The definition of food is not as straightforward as you might think. It is a substance, which comes from plants or animals, and which is consumed to sustain life. People eat food to survive, and some species of animals only consume plants. The majority of their food comes from plants. Fortunately, the majority of the nutrients in our bodies come from fruits and vegetables. Nonetheless, some of us do not eat these foods. The main sources of food include meat, dairy products, and grains.

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