What type of study is this?

This is a Cross-Sectional Study study.

Measuring and Forecasting the Healthy Eating Index in Iran: 1991–2027

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Repeated cross-sectional analysis assesses declining Healthy Eating Index trends in Iran, suggesting the need for improved dietary guidelines.

The Healthy Eating Index shows a declining trend post-2018 in Iran, impacting mortality risk and chronic diseases.
Average Healthy Eating Index over 30 years was 48.39, with notable fluctuations across provinces.
Data analysis utilized household food consumption from the Household Income-Expenditure Survey spanning three decades.
Calls for regular strategic reviews of dietary guidelines to address emerging trends and prevent health declines.

Emami et al. (2025) studied this question.

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Repeated cross-sectional analysis assesses declining Healthy Eating Index trends in Iran, suggesting the need for improved dietary guidelines.