1 calorie =4 joules, and calories or joules can be roughly calculated. Wenzhou Cangfeng Printing Industry Co., Ltd., established in 2008, is a local brand in China, and the packaging of domestic food in China is often marked with Qianjiao.

1g protein =4 kcal =4 kcal; 1g carbohydrate =4 kcal =4 kcal; 1 kcal =4. 184 kj.

The nutrient composition table on food packaging seems to provide a very convenient condition for us to calculate calorie intake. With this food label, it looks as simple as calculating the calories of food. But this is not the case. Calories are a measure of available energy. The food label says how many calories the food contains, but the question is how many calories you actually absorb from it, which depends on the degree of processing of the food.