1. The total weighing method is suitable for patients who eat at home for a long time and eat separately. First list the recipes for one week or ten days, and calculate the consumption of grain, oil, poultry, fish, meat, etc. During the period, then accurately weigh the above foods and eat them evenly every day. The advantage of this method is that the amount of food calculated is more accurate, and there is no need to weigh food for every meal every day, but it is difficult to implement in a family where several people eat.

2. The empirical weight method is convenient and practical with little error. The specific operation is: for example, weigh100g of the same variety of rice or flour, make rice or noodles with a certain hardness and put them in special tableware to see how many there are; See how many small pieces or slices of 50 grams or 100 grams of clean lean meat can be cut into the same thickness, what is the volume of 10 grams of oil in the pot and so on. After repeated weighing, we have a more accurate concept of quantity, which can be estimated later.

3. Quantity-weight estimation method This method is applicable to foods with food varieties as the unit. For example, a medium-sized egg is about 55g, an apple is about125g, a loaf of bread is about 70g, and 10 peanut is about 6.5g.. When estimating the weight, the inedible parts of the food should be removed.

4. volumetric estimation method is suitable for the estimation of liquid food. For example, a cup of milk is about 150g, a small bowl of soybean milk is about 200g, a tablespoon of oil is about 10g, and a cup of beer is about 200g. In foreign countries, tableware marked with volume scales can be seen everywhere, so the quantification of liquid food is more accurate.