Active brown adipose tissue (BAT) has recently been unambiguously discovered in human adults. Active BAT increases energy expenditure and improves glucose tolerance. Pharmacological use of glucocorticoids (GCs) is widespread in clinical practice due to their high anti-inflammatory efficacy. While short-term administration even of high doses usually is well tolerated, long-term use of medium to high amounts of GCs leads to unfavorable metabolic changes, characterized by an increase in intra-abdominal fat mass, a decrease in muscle mass and insulin resistance.