Caloric Restriction with Optimal Nutrition (CRON)

What is Caloric Restriction with Optimal Nutrition (CRON)?

CRON reduces caloric intake by 15-20% below maintenance while maintaining 100% of recommended daily nutrients. Okinawan centenarians naturally practiced ~15% caloric restriction. The key is undernutrition without malnutrition: every calorie must be nutrient-dense. Evidence from human trials suggests 1-5 years of lifespan extension. Safety threshold: never exceed 16% CR to avoid losing structural tissue.

Is there evidence for it?

How do you do Caloric Restriction with Optimal Nutrition (CRON)?

1. 1.Calculate your maintenance calories, then reduce by 15-20% (e.g., from 2000 to 1600-1700 cal/day); never go below 16% reduction
2. 2.Track nutrition with CRON-o-Meter app to ensure 100% RDA of all vitamins, minerals, and at least 1g protein per kg bodyweight
3. 3.Prioritize calorie-efficient nutrient sources: leafy greens, cruciferous vegetables, berries, wild fish, legumes, nuts, seeds
4. 4.Monitor weight daily and adjust: weight loss should be gradual (0.5 lb/week max); maintain BMI above 18.5
5. 5.Get comprehensive blood work every 6 months: monitor albumin, lymphocyte count, bone density, and hormones to ensure no malnutrition

How long does it take?

30-45 min/day for meal planning and tracking.

Is it hard to start?

hard.

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