The part of the body that does not require insulin to acquire Glucose for energy are brain and red blood cells.
Insulin refer to a peptide hormone which is secreted by beta cells of the pancreatic islets. It is the major anabolic hormone of the body because it helps to regulates the metabolism of carbohydrates, fats and protein enhancing that glucose is absorbed from the blood into liver, fat and skeletal muscle cells.
Therefore, The brain and the red blood cells does not require insulin because it does not have GLUT 4 to import glucose but have another transporter that does not depend on insulin.
Learn more about insulin from the link below.
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