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Objective. To describe the design of the Mexican 2021 National Health and Nutrition Survey (Ensanut 2021). Materials and methods. The Ensanut 2021 is a probabilistic household survey that is part of the continuous Ensanut 2020-2024; survey outreach, sampling, measurement and logistic organization are described. Results. It is planned to obtain at least 12 060 complete household interviews and 9 837 samples to determine SARS-CoV-2 seropositivity at the national level. Conclusions. Ensanut 2021 will allow to estimate the seroprevalence of SARS-CoV-2 antibodies at regional and national level; also, it will accumulate information to make state inferences for the year 2024. [ABSTRACT FROM AUTHOR]

Objective. To analyze the association between the presence of anti SARS-CoV-2 antibodies and other household characteristics and the food insecurity in a national sample of Mexican households. Materials and methods. Information at household level about food security (FS), sociodemographic factors, changes in family economy and food consumption was obtained in a national and representative sample. The relation between food insecurity (FI) and household characteristics was established through ordinal logistic regression, multinomial regression models were used to study the self-reported changes in food consumption and FI in the presence of antibodies against SARS-CoV-2 in at least one inhabitant of the household. Results. Households with seropositive cases shown a lower meat consumption. In those households which suffered an income reduction and had at least one individual positive for anti SARS-CoV-2 antibodies, the FI-in its higher levels-worsened (OR=1.225; CI95%: 1.04, 1.44). Conclusions. The food insecurity in households during pandemic worsened due to many factors, in this sense integral actions of public policies are required. [ABSTRACT FROM AUTHOR]