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 most common color of urine is yellow, which is caused by the presence of urobilin, a biochemical waste product generated from the breakdown of old red blood cells. (Your body makes about 2 million new red blood cells every day, and recycles an equal number of old ones.)