SHBG (sex hormone-binding globulin) is a carrier protein for sex hormones like testosterone and estradiol. Low SHBG levels are frequently associated with insulin resistance, metabolic syndrome, and obesity – conversely, SHBG often rises with weight loss and improved insulin sensitivity. However, SHBG is not a direct weight loss tool; it is a biomarker reflecting hormonal and metabolic status. The evidence is predominantly mechanistic and epidemiological: studies show associations but no causal role of SHBG as a 'fat burner'. Raising SHBG alone does not cause weight loss. Consumer tests marketing SHBG as a weight loss marker often overstate its clinical relevance. It is more useful to interpret SHBG in the context of hormone profile, liver function, insulin, and lifestyle. Caveat: No randomized trials demonstrate that targeted SHBG elevation induces weight loss. The measurement can, however, provide clues about underlying metabolic disturbances.
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