Calories are energy units. This is the amount of energy or heat required to raise the temperature of one gram of water one degree Celsius (1.8 degrees Fahrenheit). Energy derived from food when they are oxidized in the body is measured inkilocalories (thousands of calories).
Kilocalorie is the amount of energy required to raise 1000 grams of water one degree Celsius. Kilocalories written as "Calories"(with a capital C) or can be shortened to "Kcalorie" or "Kcal."Therefore, every time the word calorie is used in conjunction with food or nutrition, it always means kilocalories or calories.

In terms of fat loss, low-calorie diet consisting of Twinkies will result in weight loss as low-calorie diet consisting of fruits and vegetables. When considering a more nutritious fruits andvegetables won a landslide victory. Which is more filling? Fruits and vegetables win again. When considering issues other than energy content is not just about calories.