Obesity brings with it a cascade of medical problems like:
diabetes (especially diabetes type 2),
high blood pressure
and problems associated with lungs, kidneys and heart
According to a research carried out by the California Pandemic Working Group for H1N1 in 2009, obesity is an absolute risk factor for incidence of H1N1 infection in people (study strictly based on 2009 H1N1 infection) and is responsible for their death due to the disease.