Her main focus of research is the study of the long term effects of the co-exposure of environmental toxicants and nutritional conditions during gestation and infancy. Since 2002, she has been the principal investigator from the Mexico site of the ELEMENT (Early Live Exposure in Mexico to Environmental Toxicants project) birth cohort study that started in 1994. Along with Drs. Robert and Rosalind Wright and Andrea Baccarelli, has also been one of the principal investigators of the PROGRESS (Program Research in Obesity, Growth, Environment and Social Stressors) birth cohort study since its beginning in 2007. Both studies still ongoing in collaboration with Mount Sinai School of Medicine, University of Columbia, University of Michigan and University of Toronto. During that time, she was also very active designing, conducting and analyzing several projects on program evaluation of social interventions. Among the most important projects she has participated in this area is the impact evaluation of Oportunidades, the main anti-poverty program in México; the impact evaluation of Seguro Popular, a health policy aimed to finance and provide health services to more than 50 million Mexicans and she leaded the impact evaluation of 70 y más, the federal anti-poverty program for the elderly population. She had a leading role in the conduction of several national surveys on health-related topics as well. Most of her recent work is focus on impacting health policy of lead exposure in Mexico.