A research survey shows that in the general population, people who sleep less than 4 hours a night are at a 73% higher risk of developing obesity than those who sleep 7-7 hours a night, compared with an average daily People who sleep for only five hours have a 50% higher risk. The researchers, therefore, concluded that lack of sleep can easily make people obese. If the following are true, the above conclusions are most supported:. ['Lack of sleep is associated with an increased incidence of diabetes, and most people with diabetes are obese.', 'Lack of sleep can easily lead to chronic fatigue syndrome, which makes people unwilling to participate in physical exercise.', 'People with insufficient sleep have the same diet and exercise habits as those who sleep between 7 and 9 hours a night.', 'Insufficient sleep can lead to a decrease in the concentration of lipoproteins in the human body, which has the function of suppressing appetite.']