Scott Alexander, curated
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Anorexia And Metabolic Set Point

Quality
71
Strong
Claude Shift
58
Moderate
RWI
2
of 10

Summary

An explicitly speculative ('crazy speculation, I'm not an expert') but well-reasoned hypothesis: anorexia as the mirror image of obesity in lipostat / metabolic-set-point terms. Where obesity may involve leptin RESISTANCE (the hypothalamus defends a too-high set point), Scott proposes severe undereating can drive the set point DOWN via leptin HYPERsensitivity, so the body defends a too-low weight — matching anorexics' Phase-2 inability to regain weight and horror at 'fatness' even when emaciated. Three suggestive lines: (1) anorexics fidget roughly twice as much as controls, and fidgeting (NEAT) is the lipostat's involuntary weight-defense tool — a purely social paradigm can't explain it, a biological one predicts it; (2) leptin dynamics in anorexia (Heidebrand); (3) brain-tumor/lesion cases producing typical anorexia with fear-of-fatness (Treasure 2005, Chipkevitch), proving fear-of-fatness can be neurologically induced, not just 'ballet coaches and the patriarchy.' Honestly caveated (leptin is only part of the story; CSF:serum leptin complications).

Why this score

Quality 71 · Strong. Strong (71). Original, biologically literate, multi-evidence speculative synthesis with one genuinely sharp argument (fidgeting/NEAT as a discriminating test between social and biological paradigms). Held just below the rigorous critiques because it is explicitly speculative and leans on the contested set-point/lipostat model.

Claude’s paradigm shift 58 · Moderate. Moderate, high (58). The anorexia-as-mirror-of-obesity-set-point hypothesis and the fidgeting-as-evidence argument are genuinely original (Scott found little prior work); fresh but speculative.

Real-world impact 2 · Minor. Minor (2). A speculative blog hypothesis in the biology of eating disorders; no clinical or policy impact.