Well the good news is you don't have "borderline" diabetes. The bad news is you have Diabetes. First of all "borderline diabetes" is an obsolete term we don't use anymore. The term for an early state of diabetes today is Pre-diabetes. Here are the criteria FBS <100 normal, FBS 100-126 Pre-diabetes, FBS >126 Diabetes Mellitus. So with a FBS of 140 you are beyond pre-diabetes and have diabetes. Start treatment now. 1) get advice on diet and exercise (we call it life style change 2) start medication. 3) Get a good education course on diabetes 4) get a HbA1c test if not already done. At this level of blood sugar, most physicians would just start Life Style change. I would do that but add the medication metformin. This drug has been in use for decades and has few side effects, control BS, & is generic so is very cheap. Its time to start so see your Dr. & get going before it gets worse as it will without working to keep blood sugar as near normal as possible.