Calorie - Wikipedia
The calorie is a unit of energy that originated from the caloric theory of heat. [1] [2] The large calorie, food calorie, dietary calorie, or kilogram calorie is defined as the amount of heat needed to raise the temperature of one liter of water by one degree Celsius (or one kelvin).
Calorie | Definition & Measurement | Britannica
Oct 4, 2024 · calorie, a unit of energy or heat variously defined. The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius.
What Are Calories? - Live Science
Oct 28, 2022 · Calories are units of energy that a food or drink provides. You can usually find calorie counts listed on food items, and wearables like the best fitness trackers allow you monitor how many...
Kcal vs. Calories: Differences and How to Convert - Healthline
Oct 29, 2024 · Calories are a unit of energy, but in diet and exercise, the term is used to mean kilocalories (kcal). Learn the difference and what these terms mean.
Calories: Requirements, health needs, and function
Dec 13, 2017 · How many calories do you need? What are calories? Daily requirement. Calories and health. Empty calories. Takeaway. A calorie is a unit of energy. In nutrition, calories refer to the energy...
How calories are calculated: Science behind the | Live Science
Oct 14, 2022 · A calorie is a unit of energy, not a measure of weight or nutrient density. The calories you see on nutrition labels, however, are actually kilocalories, or kcals, according to the National...
Understanding Calories | Nutrition, Energy & Metabolism
Calories are simply a unit of energy, but they are a great mystery to many. They are not the enemy dieters often think they are. We need calories from food and drink to run our bodies the same way a car needs energy from gasoline and your refrigerator needs electric energy to …