The NHAP is conducted by department of nutrition and food hygiene at the school of public health, Harbin Medical University under the direction of Professor Rennan Feng. The NHAP website, with documentation for the study and detailed information about current research and publications, is available in the article " The association of weight change pattern with diabetes, hyperlipidemia and fatty liver independent of the attained weight: A case study from Internet-Based Dietary and Lifestyle Questionnaire (IDQC) data sharing". Data from the IDQC surveys are held and distributed at NHAP website, and are freely available to researchers under standard conditions. Access to data is governed by our Data Access Policy.