← All chapters·Chapter 02 · free opening

The four levers, in order

Fat mass, aerobic exercise, sleep, then diet — ranked by measured effect size, with the arithmetic that puts diet fourth.

Almost everything sold in this category is about food. Ranked by the size of the effect actually measured on inflammatory markers, food comes fourth.

This chapter is placed before the claim list on purpose. A publication that sells dietary structure and stays quiet about the three larger levers is lying by omission, and it is the one thing a competitor selling food lists cannot say.

Lever 1 — fat mass

B Across 33 studies of lifestyle, dietary, exercise and surgical interventions, each kilogram of weight lost corresponded to a mean CRP change of −0.13 mg/L, with a weighted correlation of r = 0.85 and a relationship the authors described as roughly linear (Selvin 2007, PMID 17210875).

A The mechanism is one of the few places where the biology and the clinical data line up cleanly: adipose tissue, especially visceral, is an active source of IL-6; IL-6 drives hepatic CRP production (via PMID 40657695).

Two caveats stated rather than buried. The dose-response figure is from 2007 and no synthesis of equal precision has replaced it as of 2026-09-02. And within lifestyle interventions alone the correlation is much weaker (r = 0.30, slope 0.06) — large surgical weight changes carry much of the pooled relationship.

C That reducing visceral fat specifically adds an effect beyond total weight change. Mechanistically reasonable, and no synthesis of adequate quality was located to grade it higher.