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.
If you haven't had any foods that may cause the dark yellow urine color, then there are some illnesses that can show symptoms such as dark yellow urine color. 1  Blood in the urine, also known as Haematuria, can cause darker urine. 2  Haemolytic Anemia can cause dark yellow urine color.