Tehran University of Medical Sciences

Science Communicator Platform

Stay connected! Follow us on X network (Twitter):
Share this content! On (X network) By
Adherence to the Planetary Health Diet Reduces Dietary Costs by 21% Supporting Affordable Healthy Eating Among Older Adults in Iran Publisher Pubmed



Dehnavi MK1 ; Abbasi H1 ; Hajian PN1 ; Motlagh AD1 ; Azadbakht L1, 2
Authors
Show Affiliations
Authors Affiliations
  1. 1. Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, P.O Box 14155-6117, Tehran, Iran
  2. 2. Diabetic Research Center, Endocrine and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran

Source: Scientific Reports Published:2025


Abstract

Poor dietary patterns among older adults are significantly influenced by socioeconomic status (SES) and food prices, impacting both diet quality and food choice. This study examines how dietary costs relate to the Planetary Health Diet Index (PHDI) and assesses the role of SES in Iran’s elderly population. In this cross-sectional study, 398 elderly individuals from southern Tehran were sampled. Dietary data were collected using a validated food frequency questionnaire, and adherence to the PHDI was evaluated based on EAT-Lancet guidelines. Food costs were derived from the Iranian Statistics Center and retail prices. Multivariable linear regression analyzed the relationship between PHDI adherence and dietary cost. PHDI adherence varied significantly across demographics. Higher adherence was observed in females (OR = 0.82, 95% CI: 0.71–0.95) and those with a BMI ≤ 27.5 (OR = 0.84, 95% CI: 0.73–0.97), while single individuals had higher scores (OR = 0.85, 95% CI: 0.74–0.98). Higher PHDI tertiles were linked to lower daily dietary cost, with a significant decrease observed in the highest tertile compared to the lowest (β = − 708,367 Rials, 95% CI: − 1,060,371 to − 356,362). However, this association was not significant among single and low-income participants. The study reveals that higher adherence to the PHDI is associated with reduced dietary costs, a key barrier to obtaining a healthy, balanced diet among older adults, and may thereby support better health outcomes, including malnutrition prevention and functional independence. Future research should focus on longitudinal studies to develop equitable public health strategies that promote affordable and sustainable dietary practices. © The Author(s) 2025.
Related Docs
View other Related Docs
1. Adherence to Planetary Health Diet Index in Relation to Dietary Diversity Score and Anthropometric Indices Among Iranian Older Adults, BMC Public Health (2025)
2. The Relationship Between the World Index for Sustainability and Health (Wish) Score and Mental Health in Women: A Cross-Sectional Study, British Journal of Nutrition (2024)
3. Interactions Between Vitamin D Binding Protein Variants and Major Dietary Patterns on the Odds of Metabolic Syndrome and Its Components in Apparently Healthy Adults, Diabetology and Metabolic Syndrome (2019)
4. Association of Healthy Beverage Index With Circadian Rhythm and Quality of Sleep Among Overweight and Obese Women: A Cross-Sectional Study, Eating and Weight Disorders (2022)
5. Interactions Between Vitamin D Binding Protein Variants and Major Dietary Patterns on Mental Health Status in Apparently Healthy Adults, European Journal of Integrative Medicine (2024)
6. Diet in Relation to Metabolic, Sleep and Psychological Health Status (Dimets): Protocol for a Cross-Sectional Study, BMJ Open (2023)
7. The Association Between Planetary Health Diet Index and the Risk of Colorectal Cancer: A Case-Control Study, Scientific Reports (2024)
8. Dietary Sodium Intake in Relation to Non-Alcoholic Fatty Liver Disease Risk: A Case-Control Study, Nutrition and Food Science (2020)
Experts (# of related papers)
View all Related Experts
Khadijeh Mirzaei (25)
Sakineh Shab-Bidar (16)
Other Related Docs
9. The Association Between Carbohydrate Quality Index and Nutrient Adequacy in Iranian Adults, Nutrition and Food Science (2021)
10. The Association of Dietary Approaches to Stop Hypertension (Dash) With the Odds of Diabetic Nephropathy and Metabolic Markers in Women: A Case–Control Study, BMC Women's Health (2023)
11. Meat Consumption and the Risk of General and Central Obesity: The Shahedieh Study, BMC Research Notes (2022)
12. Bibliometric Overview of the Tehran Lipid and Glucose Study (Tlgs) Publications From 2000 to 2022, Journal of Diabetes and Metabolic Disorders (2024)
13. The Association Between Dietary Micronutrient Patterns and Odds of Diabetic Nephropathy: A Case–Control Study, Food Science and Nutrition (2023)
14. Association Between Dietary Inflammatory Index and Kidney Function in Elderly Population: Results From a Cross-Sectional Study, Nutrition and Food Science (2019)
15. The Association of Dietary Nitrates/Nitrites Intake and the Gut Microbial Metabolite Trimethylamine N-Oxide and Kynurenine in Adults: A Population-Based Study, Frontiers in Nutrition (2024)
16. Is There a Relationship Between Serum Vitamin D and Semen Parameters? a Cross-Sectional Sample of the Iranian Infertile Men, Basic and Clinical Andrology (2021)
17. Dietary Inflammatory Potential in Relation to Covid-19 Severity and Symptoms Among Individuals Recovered From Covid-19: A Cross-Sectional Study; [Potentiel Inflammatoire Du Regime Alimentaire En Relation Avec La Gravite Et Les Symptomes Du Covid-19 Chez Les Personnes Gueries Du Covid-19: Une Etude Transversale], Nutrition Clinique et Metabolisme (2024)
18. Associations Between Mother–Child Dyad Dietary Patterns and Child Anthropometric Measures Among 6-Year-Old Children, European Journal of Pediatrics (2022)
19. Dietary Inflammatory Index and Breast Cancer: Report From a Large-Scale Case-Control Study, Nutrition and Cancer (2022)
20. Socio-Behavioral Factors Associated With Overweight and Central Obesity in Tehranian Adults: A Structural Equation Model, International Journal of Behavioral Medicine (2017)
21. Food Groups Intake in Relation to Stunting Among Exceptional Children, BMC Pediatrics (2020)
22. The Role of Dietary Glycemic Index and Glycemic Load in Mediating Genetic Susceptibility Via Mc4r S17782313 Genotypes to Affect Cardiometabolic Risk Factors Among Apparently Healthy Obese Individuals, BioMed Research International (2022)
23. The Association Between Dietary Sugar Intake and Neuromyelitis Optica Spectrum Disorder: A Case–Control Study, Multiple Sclerosis and Related Disorders (2019)
24. Association of Oxidative Balance Score With the Metabolic Syndrome in a Sample of Iranian Adults, Oxidative Medicine and Cellular Longevity (2021)
25. Dietary Inflammatory Index (Dii) May Be Associated With Hypertriglyceridemia Waist Circumference Phenotype in Overweight and Obese Iranian Women: A Cross Sectional Study, BMC Research Notes (2021)
26. Association of Dietary Inflammatory Index With Anthropometric Indices in Children and Adolescents: The Weight Disorder Survey of the Childhood and Adolescence Surveillance and Prevention of Adult Non-Communicable Disease (Caspian)-Iv Study, British Journal of Nutrition (2019)
27. Higher Dietary Acid Load Might Be a Potent Derivative Factor for Multiple Sclerosis: The Results From a Case–Control Study, Nutrients (2023)
28. Association of Dietary and Lifestyle Inflammation Score With Metabolic Syndrome in a Sample of Iranian Adults, Frontiers in Nutrition (2021)
29. Association Of Dietary Acid Load With Anthropometric Indices in Children and Adolescents, Eating and Weight Disorders (2021)
30. The Interactions Between Dietary Fats Intake and Caveolin 1 Rs 3807992 Polymorphism With Fat Distribution in Overweight and Obese Women: A Cross-Sectional Study, BMC Medical Genomics (2021)
31. Association Between Healthy Eating Index-2015 Scores and Metabolic Syndrome Among Iranian Women: A Cross-Sectional Study, BMC Women's Health (2024)
32. Higher Health Literacy Score Is Associated With Better Healthy Eating Index in Iranian Adults, Nutrition (2021)
33. Higher Dietary Phytochemical Index Is Associated With Lower Odds of Knee Osteoarthritis, Scientific Reports (2022)
34. Prognostic Significance of Positive Family History in Outcomes After Coronary Artery Bypass Grafting: Do We Need to Update Our Assumptions?, Journal of Cardiothoracic Surgery (2022)
35. Structural Equation Modeling Analysis of Iranian Women's Food Consumption: Influence of Socio-Demographic Characteristics and the Information, Motivation, and Behavioral Skills Model, Revista de Nutricao (2020)
36. Optimal and Thrifty Sustainable Food Baskets of Iran-2023, Iranian Journal of Nutrition Sciences and Food Technology (2024)
37. Dietary Insulin Index (Dii) and Dietary Insulin Load (Dil) and Caveolin Gene Variant Interaction on Cardiometabolic Risk Factors Among Overweight and Obese Women: A Cross-Sectional Study, European Journal of Medical Research (2024)
38. Substitution of Dietary Macronutrients and Their Sources in Association With Breast Cancer: Results From a Large-Scale Case–Control Study, European Journal of Nutrition (2022)
39. Cross Sectional Determinants of Vo2 Max in Free Living Iranians: Potential Role of Metabolic Syndrome Components and Vitamin D Status, Diabetes and Metabolic Syndrome: Clinical Research and Reviews (2022)
40. Association Between Dietary Fat and Fat Subtypes With the Risk of Breast Cancer in an Iranian Population: A Case-Control Study, Lipids in Health and Disease (2021)
41. Association of Dietary and Lifestyle Inflammation Score With Cardiorespiratory Fitness, Frontiers in Nutrition (2022)
42. Association Between Adherence to the Mind Diet and Overweight and Obesity in Children: An Exploratory Study, Clinical Nutrition ESPEN (2022)
43. Metformin Induces Weight Loss Associated With Gut Microbiota Alteration in Non-Diabetic Obese Women: A Randomized Double-Blind Clinical Trial, European Journal of Endocrinology (2019)
44. The Interaction Between Cry1 Polymorphism and Alternative Healthy Eating Index (Ahei) on Cardiovascular Risk Factors in Overweight Women and Women With Obesity: A Cross-Sectional Study, BMC Endocrine Disorders (2023)
45. Adherence to the Low Carbohydrate Diet and the Risk of Breast Cancer in Iran, Nutrition Journal (2019)
46. Dietary Patterns Are Associated With Risk of Diabetes Type 2: A Population-Based Case-Control Study, Archives of Iranian Medicine (2016)
47. Association Between Dietary Total Antioxidant Capacity and Breast Cancer: A Case-Control Study in a Middle Eastern Country, Public Health Nutrition (2021)
48. Associations Between Empirically Derived Dietary Patterns and Cardiovascular Risk Factors Among Older Adult Men: A Cross-Sectional Study, International Journal for Vitamin and Nutrition Research (2023)
49. The Relationship Between Dietary Patterns and Sleep Disorders in Shift Workers, Work (2022)
50. Potential Effect of Different Nutritional Labels on Food Choices Among Mothers: A Study Protocol, BMC Public Health (2020)