Overeating has been found to impair blood sugar (glucose) control and insulin levels but a new study suggests that the duration of a bout of overeating can affect how the body adapts to glucose and insulin processing when calorie intake increases. Obesity and type 2 diabetes have increased significantly worldwide within the past 30 years. Lifestyle factors such as overindulging in high-calorie foods play a large role in the development of these two serious health conditions. For the study researchers from Deakin University in Australia studied a small group of healthy and lean men with an average age of 22.