The effect of DASH (dietary approaches to stop hypertension) diet on anthropometric indices, blood pressure and Urinary sodium-to-potassium ratio in overweight and obese school children

Determining the effect of the DASH diet (Dietary Solution for Blood Pressure Control) on anthropometric indicators, blood pressure, and the ratio of sodium to potassium in the urine of overweight and obese elementary school children.

This research is a double-blind randomized clinical trial. Participants: the ages of 8-12 years with a body mass index above the 85th percentile are selected from primary schools in Dezful city.

At the beginning and end of the study, the anthropometric indicators and blood pressure of each child are measured. A random urine sample will also be taken to measure sodium, potassium and creatinine levels. For the diet therapy group, DASH diet is considered. Also, before the start of the study, at the end of the first month and at the end of the study, a food record book with a food frequency questionnaire will be given to each child, and their parents will be asked to record all the food and drinks that they eat during these 3 days. Express the amount they have consumed along with the amount of household units.

Inclusion criteria: the ages of 8-12 years, body mass index above the 85th percentile. Exclusion criteria: children suffering from heart problems, kidney problems, thyroid disorders or hormonal disorders and diabetes.

There will be two intervention and control groups in the study. The intervention group includes people who receive the DASH diet and the control group does not receive a diet.

Anthropometric indicators, blood pressure, sodium, potassium and urine creatinine

In this study, people are selected using the convenience sampling method, and the distribution of people between groups is done in a blocked randomization manner.

In this study, the following researchers were blinded according to the mentioned method: - A researcher assigns each participant to groups-blocks based on a random method. This was done after generating random codes. - A researcher who performs anthropometric measurements and records the data. During the first and second visit, he records the information in a form that is nameless and has a code. - A researcher who performs data analysis. All of them are blind to the study. - Based on the alphabet letters assigned to each person, and in a place separate from the above researchers, the health care provider delivers the diet method sheet to the person accompanying the child and explains it completely. The person accompanying the child does not know the type of diet (the meaning of the name of the diet) and which group they are in (intervention or control), but anyway, because they have already filled out the consent form and seen the diet sheet, guess what They are a group, it is not difficult for them. But they clearly know what study they have participated in and have already filled out the informed consent form. The researcher who performs the anthropometric measurements is independent of the health care provider who explains the diet to the child's companion. And therefore, they record the data in anonymous sheets that have random codes assigned to each person. He never asks the child or his companion about the type of diet he had. The data analyst researcher analyzes the data based on the code assigned to each person and does not know whether group A or B is the intervention or the control group. The data safety and monitoring committee, which includes the PI and one other principal investigator who also prepares the draft of the article, has access to all data after the analysis is completed, but is independent of the health care provider and measurement investigator and data recorder and analysis. are given and therefore do not interfere in the implementation.

All anonymized analyzed data will be published in the form of articles or abstracts in a peer-reviewed journal.

After completing the study and publishing the results in the form of an article

Everyone has access to the data published in the article. For other raw data, a reasonable request from the responsible administrator and in coordination with the University Ethics Committee may be possible.

Other statistical analyzes except what is printed in the article.

Corresponding author, Reza Norouzirad

With the request of the responsible executive and the approval of the ethics committee, the desired data will be provided.