Why do foods have to be digested?

Digestion is the process of breaking down complex food molecules into simpler ones that the body can absorb. There are a few reasons why this process is necessary:

1. To make nutrients more accessible: Many foods contain nutrients that are locked away within complex molecules. Digestion breaks down these molecules, releasing the nutrients so that they can be absorbed by the body. For example, proteins must be broken down into amino acids, carbohydrates into sugars, and fats into fatty acids in order to be absorbed.

2. To reduce the size of food particles: Food particles that are too large to be absorbed by the body must be broken down into smaller pieces. This is accomplished through physical processes such as chewing and stomach churning, as well as chemical processes such as the action of digestive enzymes.

3. To remove harmful substances: Some foods may contain harmful substances, such as bacteria or toxins. Digestion helps to remove these substances from the body before they can cause any damage. This is accomplished through the action of stomach acids and digestive enzymes, as well as the filtering action of the liver and kidneys.

4. To aid in the absorption of water and electrolytes: Digestion also aids in the absorption of water and electrolytes from food. This is important for maintaining fluid balance and electrolyte balance in the body.

In summary, digestion is a complex process that breaks down complex foods into simpler molecules, making them more accessible for absorption, reducing the size of food particles, removing harmful substances, and aiding in the absorption of water and electrolytes.