Additional Study Information: We are conducting a research study on the effect of high insulin levels on the buildup of excessive liver fat ("fatty liver disease") in people at risk for type 2 diabetes. We are seeking adult volunteers, aged 18-70, who are overweight or obese with a body mass index of 25-45, and have been diagnosed with, or are at risk for, prediabetes. Participants will take either placebo (non-drug) or a medication called diazoxide, which lowers insulin levels, twice daily for two weeks, each time along with a drink of a particular type of water. We will perform blood tests at several time points during the study to determine the effect of diazoxide versus placebo on blood levels of insulin, glucose (sugar), and certain fats. Participants will attend four (4) outpatient visits plus a screening visit as part of the study and will be compensated up to a total stipend (salary) of $500 and reimbursement for travel expenses. If you are found ineligible to participate in this study, you may be asked to join similar, related studies that we are conducting.