Part IV — The Industrial Turn

Part IV is the historical hinge. The book’s most important distinction belongs here: inherited reverence formed around older bread, but modern policy and habit transferred that reverence to industrial refined flour.

13. The Roller Mill

The roller mill changed flour by making white, shelf-stable, finely milled flour cheap and scalable. Stone milling, germ and bran removal, shelf life, urbanization, and the economics of whiteness all become part of the same turn.

14. White Flour and the First Metabolic Wave

The first metabolic wave has more than one cause. Refined flour, sugar, sedentary work, urban diets, and early chronic disease observations belong together, but no single variable explains the modern pattern.

15. The Food Pyramid

Bread becomes policy when grains are placed at the base of official dietary guidance. Scientific evidence, agricultural economics, institutional compromise, and public messaging all shape what the public learns to call normal.