A medical doctor who specializes in the diagnosis and treatment of obesity and related conditions.
From 'bariatrics' (medical field dealing with obesity), derived from Greek 'baros' (weight) + 'iatreia' (medical treatment), with '-ician' (one who practices or specializes). The term emerged in the mid-20th century as obesity became recognized as a serious medical issue.
The word 'bariatrician' was essentially invented in the 1950s-60s when doctors realized that obesity required specialized medical knowledge, not just lifestyle advice—it's one of the newer medical specialties in history.
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