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
- Lean proteins
- Low-glycemic carbs (vegetables, fruits, beans)
- Monounsaturated fats (olive oil, avocado, nuts)
- ×High-glycemic carbs (white bread, sugary cereals)
- ×Trans fats
- ×Excess saturated fat
AskCalories
Track meals with editable AI estimates
Use a photo, type what you ate, or dictate into chat. Review the estimated portions, calories, protein, carbs, fat, and fiber before saving.
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.