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This paper aims to analyze the cost and affordability of current diets in Argentina, compared to one diet based on National Dietary Guidelines and 3 variants of diets based on EAT-Lancet Recommendations. Methods: The methodology proposed by INFORMAS (International Network for Food and Obesity\/Non-communicable Diseases Research, Monitoring and Action Support) was used to design six model diets for a reference household, considering the most consumed food products by the Argentinean population and similar healthier and\/or more environmentally sustainable options. Nutritional information and prices of food products were obtained from official sources. Monte Carlo Simulations were performed to estimate the average cost of the diets (and variability). Affordability was measured as the percentage of average monthly household income each model diet represents. Results: On average the diet based on National Dietary Guidelines was the most expensive (274.95 USD; 95% CI: 274.85\u2013275.05), followed by the current diet (261.84 USD; 95% CI: 261.62\u2013262.06), the flexitarian diet that includes higher amount of animal protein sources (design to be more similar to the current consumption pattern in Argentina) (259.43 USD; 95% CI: 259.30\u2013259.55), and then the vegan diet (256.96 USD; 95% CI: 256.90\u2013257.03). The lowest costs were found for the current isocaloric diet (248.29 USD; 95% CI: 248.06\u2013248.52) and the flexitarian diet with less animal proteins (248.37 USD; 95% CI: 248.26\u2013248.48). Between 53% and 59% of the average income is needed to cover the cost of diets. Conclusions: Diets based on National Dietary Guidelines are on average the most expensive (least affordable), while the least expensive (most affordable) are the current isocaloric diet and the flexitarian diet with fewer animal protein sources, suggesting that there are dietary options that can reduce greenhouse gas emissions and provide health benefits without increasing food expenses.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12937-025-01212-7","type":"journal-article","created":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T07:29:44Z","timestamp":1761118184000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Cost and affordability implications of transitioning from current diets to National dietary guidelines and EAT-Lancet recommendations in Argentina: a modelling study"],"prefix":"10.1186","volume":"24","author":[{"given":"Florencia","family":"C\u00e1mara","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leila","family":"Guarnieri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Victoria","family":"Tiscornia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefanie","family":"Vandevijvere","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sally","family":"Mackay","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Boyd","family":"Swinburn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luciana","family":"Castronuovo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,10,22]]},"reference":[{"key":"1212_CR1","unstructured":"World Health Organization. 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