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Is the “Calories In, Calories Out” Model Broken?
The old-school model says -
- Eat 2,000 calories therefore your body “gets” 2,000 calories.
- Burn 2,000 calories = balance.
But in reality, the MICROBIOME (gut bacteria) acts like a middleman that decides how much of those calories your body actually absorbs.
Firmicutes vs. Bacteroides Example
Person A (more Firmicutes) -
- Eats 2,000 calories.
- Firmicutes extract extra energy from carbs and fiber.
- Maybe they actually absorb 2,200+ calories worth.
- Excess energy stored as fat.
Person B (more Bacteroides) -
- Eats 2,000 calories.
- Less efficient at extracting calories so maybe they absorb 1,800–1,900 calories.
- More food passes through unabsorbed resulting in less fat gain.
So two people, same meal, same exercise… totally different fat gain outcomes.
Why This Matters in Weight Loss
- It explains why some people feel like they “gain weight just looking at food.”
- It also explains why calorie-restriction diets sometimes fail as the microbiome is still extracting extra calories.
- Addressing the gut balance (Firmicutes down, Bacteroides up) makes the “calories in” part of the equation more favorable.
FitnHealthy Forever Tip - The same 2,000 calories on a nutrition label is not the same 2,000 calories once the microbiome processes it.
What questions did this create in your Mind? ✅
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Is the “Calories In, Calories Out” Model Broken?
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