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The joint analysis of two INED longitudinal surveys, one based on a national sample and the other on a sample of Parisians, presents a reconstruction of the residential history of a cohort born between 1926 and 1935 and an evaluation of the role of the Paris region in the migration patterns of these generations . The first part of the paper advocates the advantages offered by such longitudinal data which nevertheless presents the researcher with new challenges . For those French generations born between the two world wars, the beginnings in the post-war housing crisis were difficult . A comparison of the social as well as the residential histories of individuals confirms the close link between geographical and social mobility . The analysis of the social origin and the occupational characteristics of individuals in these categories exhibits the high social mobility in the Paris region which favours dynasties of professionals and provides better opportunities for the other occupations . The Paris region appears as the ideal location to improve one's chances of social advancement . Another characteristic of the post-1950s housing transformation is the diffusion of home-ownership . This affected provincials and Parisians in different ways, both of which are closely examined .

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BackgroundFew studies have focused on the influence of retirement on dietary behaviors. Our study aimed at assessing the associations between transition to retirement and changes in dietary intake in French adults, particularly according to spousal retirement and baseline income.MethodsThis prospective study included 577 French participants from the NutriNet-Santé cohort who retired over a 5-year follow-up (2009–2014 or 2010–2015). At baseline and every year, dietary intakes were assessed using 24 h records. Repeated measures of dietary intake were analysed using mixed models adjusted for energy with random effects of time and period (before and after retirement) to assess changes following retirement for each gender.ResultsAfter retirement, intakes of saturated fatty acids and sodium increased in both genders. Women showed specific changes after retirement: decrease in the score of adherence to recommendations and in intakes of fruits, proteins, vitamins; increase in intakes of fatty sweet products. In men with the lowest income at baseline, specific changes in intake were associated with retirement such as decrease in intake of dairy products and increase in intake of lipids.ConclusionsTransition to retirement was associated with unhealthier dietary intakes. These results may help defining interventions during this vulnerable life-period.Trial registrationThis study was conducted according to guidelines laid down in the Declaration of Helsinki and all procedures were approved by the Institutional Review Board of the French Institute for Health and Medical Research (IRB Inserm No. 0000388FWA00005831) and the French Data Protection Authority (Commission Nationale Informatique et Libertés No. 908450 and No. 909216). Electronic informed consents were obtained from all participants.Electronic supplementary materialThe online version of this article (doi:10.1186/s12966-017-0527-6) contains supplementary material, which is available to authorized users.

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