The methods of population dietary survey do not include questionnaires, 24-hour memoirs and individual dietary records. The following will introduce in detail the commonly used methods of population dietary survey, their characteristics and application.

1. Questionnaire survey

Questionnaire survey is a common method of population dietary survey, and dietary information is obtained by distributing questionnaires to participants. Participants should answer questions according to their diet, such as frequency, size and types of food they eat.

24-hour memoir

24-hour memoir is a simplified version of dietary survey method, and participants need to recall and record all the food and drinks they have eaten in the past 24 hours. This method can provide relatively accurate dietary information, but there is still the possibility of memory bias.

iii. Individual dietary records

Individual dietary records are a complicated and accurate dietary survey method, and participants need to record all the foods and drinks they eat every day in detail and estimate their intake. It usually takes several days or even more than a week to get more accurate data.

IV. Cross-comparison method

Cross-comparison method is a survey method used to evaluate the frequency and quantity of food intake. Participants estimate their dietary intake by comparing the food they have eaten with the food pictures or models provided.

Expand knowledge:

1. Biomarker method: Biomarker method is a method to assist people's dietary survey, and to evaluate dietary intake by detecting specific chemicals in human body. For example, the intake of certain nutrients is measured by analyzing metabolites in urine, blood or oral mucosa samples.

2. Weighing method: Weighing method is an accurate dietary survey method, and participants need to weigh and record the food and drinks they eat. This method can provide accurate intake data, but it is also cumbersome.

It is very important to choose a suitable method when conducting a population diet survey, and factors such as the purpose of the survey, sample size and feasibility need to be considered. I hope this information will help you. If you have any other questions, please feel free to ask.