The invention pertains to use of DGAT-1 inhibitors to treat and/or prevent overweight, obesity and various diseases and disorders associated therewith. Other conditions also can be ameliorated or avoided, such as high postprandial triglycerides or diet-related hypertriglyceridemia, cardiovascular risk associated with excessive triglycerides, and insulin resistance/glucose intolerance in overweight patients, those with diabetes or other glucose metabolic disorders such as Syndrome X and/or polycystic ovary disease. Compounds and compositions suitable for use in the disclosed methods are also provided.