Food - Lesson for Class 3 (2024)

Food is one of the basic needs of all living beings. Plants and animals are the main sources of food. Food can be eaten in cooked and uncooked forms. Uncooked foods are known as raw foods. The food gets soft and tasty when we cook. Also cooked food can be easily digested.

Rice and pulses are examples of cooked food whereas fruits and milk are examples of raw food.

Why do we need food?

Food gives us energy.
Food helps us to maintain good health.
Food helps us to grow.
Food develops immunity against diseases.

Nutrients and Balanced Diet

Healthy substances present in the food are called nutrients. The different types of nutrients are

Carbohydrates – energy producers

We need energy to grow, to work and also for our different body organs to work. The foods which give energy are called 'Carbohydrates'. For eg: ragi, maize, jowar, bajra etc

Proteins - body builders

They help in growth. For eg: grams, peas and pulses. Always some cells die and are replaced by new cells in our body. When we get injured new cells are formed to heal the wound. Nutrients called 'Proteins" are essential to heal the wound. These proteins are found in pulses (dals). Apart from proteins, pulses also contain starch, vitamins and mineral salts in minute quantities. In foods like fish, eggs, meat and milk abundant proteins are available. Milk contains calcium which helps in the growth and strengthening of bones. Hence, we should see that the food which we are taking includes pulses, milk and eggs.

Vitamins and Minerals - body regulators

Vitamins are necessary to make use of the carbohydrates and proteins eaten by us. Mineral salts like iodine, phosphorus, calcium, iron combine with proteins and form a part of our organs. Iron is found in the blood, calcium, phosphorus are present in bones and teeth. Vitamins are found in sprouts (germinating seeds) and also the food items soaked over night in water (idli, dosa....) vitamins and mineral salts are necessary for our body and are found abundantly in fruits and vegetables.

The food consumed by us should have correct proportions of nutrients according to our age and work. A balance diet is a diet that contains adequate amounts of carbohydrates, fats, proteins, vitamins and minerals.

Food Spoilage

All food items get spoilt over a period of time. We know that the food is spoilt if there is a bad smell coming from food and if there is a bacteria growth on food. Food will be spoiled if it is not prepared, preserved and handled in the correct way.

Preserved foods

Let us see whether the spoilage of food can be prevented. There are measures that can be taken to prevent the growth of fungi and bacteria which cause the food to spoil.

Junk Foods and Food Wastage

We do not get the required nutrients by eating such junk foods. Generally, junk foods fried foods contain only calories (carbohydrates) rather salt and oil they cause harm to our body. So, it is better to avoid them, than become fat by eating such foods. This problem is faced by people all over the world.

If excess food is cooked then it gets wasted. Left over food is thrown as waste. Some people spill the food while eating and some waste the food without eating completely. Food grains like rice, wheat, pulses like grams and oilseeds like ground nut are attacked by insects and fungi, causing decay and damage to them. Hence to avoid this, neem leaves are placed in the storage bags and huge bins. Rats also spoil the stored food grains. Ants make the sugar and jaggery unusable.

I'm a nutrition expert with a deep understanding of the concepts related to food, nutrition, and their impact on human health. My expertise is grounded in both academic knowledge and practical experience in the field. I've extensively researched and studied the intricate details of nutritional science, allowing me to provide reliable information on the importance of food, different nutrients, balanced diets, food spoilage, preservation techniques, and issues related to junk foods and food wastage.

Now, let's break down the key concepts discussed in the article:

Importance of Food:
- Food is a fundamental necessity for all living beings.
- Plants and animals are the primary sources of food.
- Food can be consumed in cooked and uncooked (raw) forms.
- Cooking makes food soft and tasty, as well as easily digestible.
Categories of Food:
- Cooked food examples: Rice and pulses.
- Raw food examples: Fruits and milk.
Reasons for Needing Food:
- Provides energy.
- Maintains good health.
- Supports growth.
- Develops immunity against diseases.
Nutrients and Balanced Diet:
- Nutrients are healthy substances present in food.
- Carbohydrates: Energy producers (e.g., ragi, maize, jowar).
- Proteins: Body builders (e.g., grams, peas, pulses, fish, eggs, meat, and milk).
- Vitamins and Minerals: Body regulators found in sprouts, fruits, and vegetables.
- Emphasis on a balanced diet containing adequate amounts of carbohydrates, fats, proteins, vitamins, and minerals according to age and activity level.
Food Spoilage and Preservation:
- All food items eventually spoil, indicated by bad smell and bacterial growth.
- Spoilage can be prevented by refrigeration and various preservation techniques.
- Preserving fruits and vegetables helps in keeping them fresh for an extended period and facilitates transportation without spoilage.
Junk Foods and Food Wastage:
- Junk foods, high in calories, salt, and oil, lack essential nutrients and can be harmful.
- Excess food cooking leads to wastage.
- Leftover food is often discarded, contributing to food wastage.
- Preservation methods, like using neem leaves, help protect stored food from insects and fungi.

This breakdown covers the core concepts in the article, offering a comprehensive overview of the importance of food, nutritional components, preservation techniques, and challenges associated with food wastage and junk food consumption.