SLC2A3 and sarcoidosis: In clinical context of tissue inflammation, such as myocarditis, and sarcoidosis, GLUT-4 is suppressed by preparing the patient through prolonged fasting and a high-fat, low-carbohydrate diet approximately 24 h before the examination, whereas GLUT-1 and GLUT-3 are overexpressed in immune system cells and are not influenced by fasting and diet, thereby increasing the influx of glucose to the myocardium [68, 69].