Calorie is a unit to measure the energy content in food, which is traditionally expressed in calories, also known as calories. Joule is the basic unit for measuring energy, work and heat in the international system of units. 1 calorie equals 4. 184 joules.

Therefore, 65,438+0,000 kilojoules is equivalent to 65,438+0,000,000 joules. When converted into calories, just divide 65,438+0,000,000 joules by 4.65,438+0.84 to get 239 calories. It should be noted that the contents of kilojoules and calories are usually marked on food nutrition labels at the same time, but calories are often expressed in kilocalories, so be careful not to confuse them with Joules.

A loose method for judging the calorie of food

1, energy density

Vegetables with high water content are generally low in calories, such as rape and cabbage, because the calories of water are very low. Correspondingly, foods with low water content, such as some beans and eggplant, are generally high in calories. For another example, a bowl of rice can be boiled into three bowls of porridge after adding water. Besides water, rice is still those rice, but with more water, there will be more "water".

2. The sweeter, the higher the calories.

For ordinary fruits and vegetables, calories mainly come from fructose and starch, which is what we often call carbohydrates. Therefore, for the same kind of fruit, we can generally think that the sweeter the calories, the higher the calories, such as pears and apples that we often eat.

Reference to the above content: Baidu Encyclopedia-Qianjiao