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Diet protocol

Zone

The Zone Diet, developed by Dr. Barry Sears, popularized the idea of macro tracking for the general public. The protocol is simple: every meal hits a 40% carbs, 30% protein, 30% fat split.

Its mechanistic argument (insulin and inflammation control) is debated, but the structure of macro tracking influenced almost every diet app since.

Macro split

Carbs

40%

Protein

30%

Fat

30%

Same ratio every meal

Foods to eat

  • Lean proteins
  • Low-glycemic carbs (vegetables, fruits, beans)
  • Monounsaturated fats (olive oil, avocado, nuts)

Foods to avoid

  • High-glycemic carbs (white bread, sugary cereals)
  • Trans fats
  • Excess saturated fat

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Use a photo, type what you ate, or dictate into chat. Review the estimated portions, calories, protein, carbs, fat, and fiber before saving.

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What it is

Every meal: 40% carbs, 30% protein, 30% fat. Calorie-restricted (~1,500-2,000 kcal/day for most). Specific 'block' system for portion sizing.

Pros

  • Introduced macro tracking to mainstream
  • Balanced approach without extreme restriction
  • Compatible with most cuisines

Cons

  • Hitting 40/30/30 every meal is friction
  • Mechanistic claims (about eicosanoids) outpace research
  • Block system is harder than direct macro tracking

Best for

People who want consistent macro structure across meals and don't mind precision tracking.

Research

Modest — original studies showed weight loss and metabolic improvements, but no clear edge over equivalent calorie-restricted diets.

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