[Change in prevalence of physical and sports activities in a cohort of students].

Background: Sedentary lifestyle is one of the worldwide problems of Public Health. Given that, physical activity has both direct and indirect effects on the mortality and morbidity on non-communicable chronic diseases. The aim was to determine the change in prevalence of sedentary lifestyle in a cohort of students.

[Food consumption in and around the school].

Background: elementary school students usually stay in school 4.5 hours a day in Mexico. The main food consumption is outside school.

[Activities after school time and obesity in children. Influence of family and neighborhood environment].

Background: elementary school children spend little time at the school in Mexico. The aim was to investigate the activities after school time in children and to determine the presence of overweight and obesity.

Methods: one hundred and seventy two children of both sexes were included.

Blastocystis hominis among food vendors in Xochimilco markets.

Blastocystis hominis is a pathogenic protozoon that lives in the human bowel and causes diarrhea: the mode of transmission is a passive one, through the ingestion of stool-contaminated water or foods that contain infective forms of the parasite. The purpose of this study is to report the prevalence of Blastocystis hominis among food vendors in the markets within the Xochimilco jurisdiction, Mexico City, Mexico. A cross-sectional study was conducted in which food vendors answered an epidemiological questionnaire and underwent a serial stool culture.