Ashley Grossman, an endocrinologist at the University of Oxford, believes that obesity and diabetes can be avoided by keeping the windows open for fresh air, based on research conducted by Dutch scientists on the health effects of global warming. Researchers have explained that global warming by one degree Celsius per year increases the incidence of diabetes because the human body stops using calories to maintain body heat in hot conditions, insulin sensitivity increases, and obesity occurs due to this. Also, opening windows and doors for ventilation, especially at night, will reduce the risk of disease, according to the conclusion of the research.