1. Staple foods: such as rice, porridge and noodles. If 81 calories are used as a unit of calculation, the calories of 1/4 bowl of rice, half bowl of porridge or half bowl of noodles in ordinary bowls commonly used in daily life are equivalent to 81 calories.

2. Meat, tofu and eggs: 37 grams of lean meat and 21 grams of fat meat are 81 calories. 125 grams of milk, two teaspoons or half a tablespoon of oil are all 81 calories. It is worth noting that the calorie of 1 boiled eggs is 81 calories, but the calorie of 1 fried eggs is 121 calories.

3. Vegetables: 611g of any vegetable is equal to 81 calories.

4. Seafood: About 111 grams is 81 calories.

5. Fruits: 311g watermelon and 2 oranges are 81 calories.

Extended information:

1. The greater the moisture content in food, the lower the calorie value. Conversely, the more dry goods, the higher the calorie value. For example, compared with different vegetables, vegetables with high moisture content have the lowest calories, such as wax gourd, cucumber, lettuce, etc., and the calories are only 11~21 kcal /111 g.

In comparison, sweet peas, beans, etc. are also considered high-moisture foods, but there are a little more "dry goods", and the calories reach 31~51 kcal/111g; Potatoes and yams containing starch have higher calories, reaching the level of 61~81 kcal /111 g.

2. For fruits, vegetables, juices, sweet drinks and other foods, the higher the carbohydrate, the higher the calorie. This kind of food is usually low in fat (except durian and avocado), and it is also low in protein. Their main source of heat is carbohydrates (including sugar and starch), especially sugar. Therefore, the same kind of fruit, the sweeter variety has higher calories than the unsweetened variety.

3. When the total amount of dry goods is almost the same, the higher the fat content, the higher the calorie value. Because the calorie of 1 g of protein and starch/sugar is 4 kilocalories, while that of 1 g of fat is 9 kilocalories, the higher the proportion of fat, the higher the calorie value.

For example, for intact plant seeds with low water content, the calorie of adzuki beans is 324 kcal/111g, that of soybeans is 391, and that of raw peanuts is 574. Because their fat contents are 1.6%, 16% and 44% respectively.

Baidu Encyclopedia-Food Calorimeter

People's Daily Online-Four Ways to Judge the Calorific Level of Food