Food Nutrition and Public Health

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Presentation transcript:

Food Nutrition and Public Health UG3, Semester 6 Course Code: FAB-361 Food Nutrition and Public Health Lecture X

Epidemiology The study of the distribution and determinants of health-related states or events in specified populations, and the application of this study to control of health problems. epidemiologists study sick and healthy people to determine the crucial difference between those who get the disease and those who are spared epidemiologists study exposed and non-exposed people to determine the crucial effect of the exposure

Uses of Epidemiology..

Two Broad Types of Epidemiology..

Person.....

Geographic Place.... Time..... Time since an event Age Seasonality

Jemal et. al., 2010

Trends in lung cancer mortality rates by sex in select countries, 1950-2006 Jemal et. al., 2010

Host..... Agent..... Environment..... Personal traits Behaviours Genetic predisposition Immunologic factor Agent..... Influence the chance for disease or its severity Biological Physical Chemical Environment..... Contribute to the disease process External conditions Physical/biological/social

Epidemics Occur when....... host, agent and environmental factors are not in balance due to new agent. due to change in existing agent (infectivity, pathogenicity, virulence). due to change in number of susceptibles in the population due to environmental changes that affect transmission of the agent or growth of the agent.

A Mixed Bag in Michigan