Insulin is a naturally occurring hormone made by the pancreas that helps our body use or store the glucose (sugar) it gets from food. For people with diabetes, either the pancreas does not make enough insulin to meet the body's requirements, or the body cannot properly use the insulin that is made.
The yellow color in normal urine comes from a substance known as urochrome. Urochrome is also known as urobilin and is the result of hemoglobin breakdown. Hemoglobin is the protein in red blood cells that enables oxygen to be taken around the body.
The yellow color of urine is usually because of urobilin which is a product of bilirubin degradation. The yellow color may be because of two reason : 1. Amount of urine solvent i. e. water is less, as we see in case of dehydration. This is temporary. It goes away when you are properly hydrated.