Jeffrey Salazar
Calories are a measure of energy, with 'small' calories (cal) estimating the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius, and 'big' calories (Cal) referring to the calories in food. The number of calories we consume is linked to weight gain and weight loss, with a calorie deficit of 500 to 600 calories per day helping a person to lose weight. However, not all calories are equal, and the type of food we eat is also important. For example, a diet high in animal fats and red meat increases the risk of certain cancers, while a diet high in fruits, vegetables and whole grains decreases this risk.
| Characteristics | Values |
|---|---|
| Definition | Calories are a measure of energy |
| Types | Small calories (cal) and big calories (Cal) |
| How they work | The number of calories in a food is the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius at 1 atmospheric pressure |
| How they relate to diet | Calories are vital for health but only pose a health risk when people consume more than the recommended amount |
| How they relate to weight | To lose weight, you need to eat fewer calories than your body burns each day. To gain weight, you need to consume more calories than you expend |
| How they relate to nutrition | The body processes different foods with the same number of calories differently. For example, a diet high in animal fats (particularly red meat) increases the risk of certain cancers |
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What You'll Learn
The difference between 'small' and big' calories
Calories are a measure of energy. Small calories (cal) refer to the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius at 1 atmospheric pressure. Big calories, or kilogram calories (Cal), are more commonly known and refer to the calories in food. One big calorie is equal to 1,000 small calories.
The number of calories in a food item is determined by burning a sample of the food and recording how much energy is released in the form of heat. However, not all of the energy in food that can be burned in a lab is available to the human body. The metabolizable energy is the difference between the total energy of the food consumed and the energy that passes out of the body undigested.
Calories are linked to weight gain and obesity, but they are also vital for health. Consuming more calories than you burn will lead to weight gain, while eating fewer calories than you burn will lead to weight loss. It is important to note that not all calories are equal. For example, a diet consisting solely of sugars and refined carbohydrates without adequate protein intake will lead to increased insulin spikes and fat storage. On the other hand, increasing caloric consumption from fruits, vegetables, and whole grains can decrease the risk of certain types of cancers.
When considering calories, it is important to take into account not just the number of calories but also the type of food and its nutritional value. A person's diet and level of physical activity should also be considered when thinking about calories.
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How calories are related to weight gain and weight loss
Calories are directly related to weight gain and weight loss. The calorie equation states that calories in must equal calories out to maintain your weight. If you eat fewer calories than you burn, you will lose weight, and if you eat more calories than you burn, you will gain weight. This is because any excess calories that you don't use for energy will turn into fat.
To lose a pound a week, you must burn or cut back on about 3,500 calories over the course of the week. This equates to about 500 calories a day. To make this easier, you can consider eating 250 calories fewer and burning an extra 250 calories per day through physical activity.
However, the relationship between calories and weight loss is complicated, and many other factors play a role in affecting healthy, sustainable weight loss. For example, there are conflicting studies addressing whether the type of calories or foods consumed, or how they are consumed, affects weight loss. Studies have shown that foods that require a person to chew more and are more difficult to digest result in the body burning more calories, sometimes referred to as the thermic effect of food.
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The importance of balancing calories with nutrients
Calories are a measure of energy. The amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius at 1 atmospheric pressure is known as a "small" calorie (cal). A "big" calorie, or kilogram calorie (Cal), is more commonly known and refers to the calories in food. One big calorie is equal to 1,000 small calories.
Calories are vital for health, but they only pose a health risk when people consume more than the recommended amount. A person can use a calorie calculator app to find out how many calories they need in terms of age, weight, and sex. Maintaining a calorie deficit of 500 to 600 calories per day can help a person lose weight.
However, not all calories are equal. An equal amount of calories from different foods does not mean that they will affect the body in the same way. For example, a diet consisting solely of sugars and refined carbohydrates without adequate protein intake will result in large spikes in blood sugar and increased fat storage. On the other hand, increasing caloric consumption from fruits, vegetables, and whole grains decreases the risk of certain types of cancers.
Therefore, it is important to balance calories with nutrients. While calories are important for weight management, it is also crucial to consider the quality of those calories and ensure that the body is getting the right balance of nutrients.
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How calories are measured
Calories are a unit of energy or heat. The original definition of a calorie was the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water by 1 degree Celsius. This is now defined in terms of the joule.
Food energy is measured in kilocalories (kcals), which are commonly referred to as calories. A kilocalorie is the amount of energy needed to raise 1 kilogram of water by 1 degree Celsius. To determine the kilocalories in a food, the food is placed in a bomb calorimeter, which is a sealed container surrounded by water. The food is then completely burned and the resulting rise in water temperature is measured. This method is not frequently used today.
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The 'calories in, calories out' concept of weight loss
Calories are a measure of energy. The amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius is known as a "small" calorie, while a "big" calorie, or kilogram calorie, is more commonly known and refers to the calories in food.
The "calories in, calories out" concept of weight loss is based on the idea that to lose weight, you need to eat fewer calories than your body burns each day. Conversely, to gain weight, you need to consume more calories than you expend. However, it's important to note that not all calories are equal. For example, obtaining your daily calories only from fat may numerically equate to the calories you can get from fruits and vegetables, but you will lose out on the potential health benefits of the latter. Studies have shown that an increase in caloric consumption from fruits, vegetables, and whole grains decreases the risk of certain types of cancers, while a diet high in animal fats increases the risk.
When considering calories, it's important to take into account your diet and level of physical activity. A person can use a calorie calculator app to find out how many calories they need based on their age, weight, and sex. Maintaining a calorie deficit of 500 to 600 calories per day can help with weight loss. However, it's worth noting that not all the energy in food is available to your body. The metabolizable energy is the difference between the total energy of the food consumed and the energy that passes out of your body undigested.
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Frequently asked questions
Calories are a measure of energy. Small calories (cal) refer to the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius. Big calories, or kilogram calories (Cal), refer to the calories in food and are more commonly known.
Calories are related to weight because they measure the energy content of food and drink. If you eat more calories than you burn, you will gain weight. If you eat fewer calories than you burn, you will lose weight.
No. For example, a diet consisting of sugars and refined carbohydrates without adequate protein intake will cause blood sugar spikes and increased fat storage. A diet high in fruits, vegetables, and whole grains decreases the risk of certain types of cancers.
