Insulin is a hormone that prevents sugar from building up too high in your blood. For example, if you consume too many carbs and your blood sugar rises too high, insulin comes in and removes it to help keep the blood sugars at a constant level. Normally, sugar is used as fuel in the body. But, with insulin resistance, sugar is converted into fat. One of the purposes of insulin is to prevent fat-burning and encourage fat-storing. Learn how to test your insulin resistance in this Educational Video How to Test for Insulin Resistance
There are more ways to measure your insulin resistance, including without a blood test. You can use your waist-height ratio, which you can find out right at home. This is much more accurate than just weighing yourself.
See video for more information Test Without a Blood Test