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What is a calorie

What is a calorie

What is a calorie?

A calorie is the amount of heat that can increase the temperature of one gram of water by one degree Celsius. The calories in food provide energy in the form of heat so that our bodies can function. Our body handles an amount of calories and burns it like fuel to give us energy so that we can work and stay healthy. Many dieticians count calories and try to reduce calorie intake to lose weight.

definition of Calorie and kilocalorie

When the term “calorie” is used for nutrition, by dieters or simply by consumers who are talking about food, they are usually using a casual definition of calories. But they are actually referring to kilocalories, which is what you see on the nutrition label. Thus the two terms are different.

definition of Calorie:-

1 gram of water is the amount of heat required to raise the temperature by 1 degree Celsius.

definition of kilocalorie:-

1 kilogram of water is the amount of heat required to raise the temperature by 1 degree Celsius. One kilocalorie is equal to 1000 small calories. Kilocalories are sometimes called “food calories” or “calories” are shortened when referring to energy in food.

Another unit of measurement used to determine the amount of energy is called a “joule”. One small calorie is equivalent to just under 4.2 joules. One kilocalorie (kcal) is equivalent to about 4.2 kilojoules.

Calories in food

calorie in food items

Different types of food provide different levels of energy. The food which contains fat, we get more calories from it.

We eat fewer calories from protein and carbohydrate foods. This is the reason that many nutritionists recommend that if you want to lose weight, then eat less fat food.

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Nutrients per gram of calories

Fat: 9 calories per gram
Protein: 4 calories per gram
Carbohydrates: 4 calories per gram

How many calories do we need in a day?


1500 calories if you want to lose weight.
2000 calories if you want to maintain weight balance.



2000 calories if you want to lose weight.
2500 calories if you want to maintain weight balance.

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What is one calorie?

You may think that calories are important only for dieters / people who are losing weight. We often hear that people eat less calories or burn more calories with exercise to lose weight. But calories are important for everyone.

Calorie is not really a thing, it is a unit of measurement. A calorie measures the amount of energy in food and beverages that we consume. We all need this energy to live and stay healthy.

The food we eat becomes the fuel that drives our body. Healthy food provides calories (energy) and important nutrients for building strong bones and muscles. Drinks also contain calories. But not all calories are healthy. For example, soda is often called “empty calories”. This means that they provide calories but their nutritional value is zero.

Calories in different foods items


food itemQuantityCalories
Banana1 piece 80 – 100
Potatoes170 – 90
Butter one spoon45 – 50
Grape 1040 – 50
Milk 1 cup (220ml – 250ml)140 – 170
Egg165 – 85
Cheese50 gm130
Orange 155 – 70
Apple 150 – 60

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In Conclusion, If you are losing weight, then eat low calorie foods. You need the right amount of calories so that you can keep your body healthy.
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