Why must some foods be cooked before they are eaten?

There are several reasons why some foods must be cooked before they are eaten:

1. Safety: Cooking kills harmful microorganisms, such as bacteria, viruses, and parasites, that may be present in raw food. These microorganisms can cause foodborne illnesses if ingested. Cooking food to a proper internal temperature ensures that any potential pathogens are eliminated.

2. Digestibility: Some foods, such as beans, lentils, and certain vegetables, contain complex carbohydrates that can be difficult for the human digestive system to break down. Cooking breaks down these complex carbohydrates, making them easier to digest and absorb.

3. Enhanced flavor and texture: Cooking brings out the natural flavors and aromas of food. It also changes the texture of food, making it softer, crispier, or chewier, depending on the cooking method.

4. Preservation: Cooking can help preserve food by inhibiting the growth of microorganisms and enzymatic reactions that can cause spoilage.

5. Nutritional changes: Cooking can cause changes in the nutritional content of food. For example, cooking can increase the bioavailability of certain nutrients, such as lycopene in tomatoes and beta-carotene in carrots. However, some nutrients, such as vitamin C, can be lost during cooking.

It's important to follow recommended cooking guidelines and temperatures to ensure food safety and nutritional value.