Why is fiber important?
Short answer first. Full logic in the chapter.
Fiber is protein's silent partner in shutting down hunger.
How it works:
- Physically stretches your stomach — triggering mechanical satiety signals to the brain
- Slows digestion — keeps you fuller longer between meals
- Feeds gut bacteria — a healthy microbiome regulates appetite hormones
- Buffers insulin spikes — wraps carbs in a fiber matrix, slowing their absorption
Targets: 25-35g per day from whole food sources.
Best sources: Broccoli, spinach, beans, lentils, berries, oats, flaxseed.
Simple rule: If your plate doesn't have something green on it, add something green.
From the Book
Chapter 5: The Math of Fat Loss
Connected ChapterChapter 5: Fueling the Engine
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