The concept of consuming 2 kilocalories is equivalent to .2 grams of fat.

in international units, energy should be expressed in joules. 1 calorie =4.182 joules, then 1 kilocalorie =4.182 kilojoules. This unit is sometimes used to express the energy in food. Most of the time, people still use kilocalories to calculate the energy in food because it is more convenient.

1 gram of starch or sugar contains 4 kilocalories; One gram of fat contains 9 kilocalories, and one gram of protein contains 4 kilocalories. If you eat 1 grams of fat, you will bring 9 kilocalories to your body. If you eat 5 grams of popcorn, you will increase the energy supply by about 17 kilocalories.

Energy intake per day:

Generally speaking, it is healthy to lose one kilogram (1kg) every two weeks and it is not easy to rebound. To burn one kilogram (1kg) of fat, it takes about 77 calories. If we want to achieve the goal of reducing .5kg per week, we need to reduce about 5 calories per day. For the women just cited, the daily intake should be: 2147-5=1647 calories.

It should be noted that even if the desire to lose weight is strong, it is not recommended that men consume less than 1,6 calories and women consume less than 1,2 calories a day.