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Weight Loss

The science of fat loss — what actually works and why

300–500
kcal/day
Recommended deficit
0.7–1g
per lb bodyweight
Protein target
0.5–1 lb
per week
Sustainable loss rate
25–30%
of calories burned in digestion
TEF for protein

Energy Balance — The Foundation

CaloriesTDEEDeficit

    Fat loss at its core is thermodynamics: you must be in a caloric deficit (consume fewer calories than you expend). This is not controversial. But the *quality* of your diet affects how easy or sustainable that deficit is.

    TDEE (Total Daily Energy Expenditure) components:

  • BMR — basal metabolic rate (~60–70% of TDEE)
  • TEF — thermic effect of food (~10%)
  • NEAT — non-exercise activity thermogenesis (~15–20%) — fidgeting, walking, posture
  • EAT — exercise activity thermogenesis (~5–15%)

    • NEAT is often the most underappreciated lever. Active individuals spontaneously burn 1,000+ more calories/day than sedentary ones even without formal exercise.

Protein — The Most Important Macro

ProteinMuscle PreservationSatiety

    When in a caloric deficit, protein intake determines whether you lose fat + muscle or fat alone.

    Why protein is critical for fat loss:

  • Highest thermic effect (~25–30% of calories burned in digestion)
  • Highest satiety — suppresses appetite and ghrelin
  • Preserves lean mass during caloric restriction
  • Supports muscle protein synthesis even in a deficit

    • Target: 0.7–1g per lb of body weight (or ~1.6–2.2g per kg)

    Prioritize whole food sources: chicken breast, eggs, Greek yogurt, cottage cheese, fish, lean beef.

Visceral Fat — Why It's Dangerous

Visceral FatInflammationMetabolic Risk

    Not all fat is equal. Visceral fat — the fat packed around your organs (liver, intestines, heart) — is metabolically active and inflammatory.

    What visceral fat does:

  • Releases inflammatory cytokines (IL-6, TNF-α) chronically
  • Causes insulin resistance (especially liver fat → hepatic insulin resistance)
  • Elevates cardiovascular risk
  • Drives elevated triglycerides and low HDL

    • Most effective ways to reduce visceral fat:

  • Caloric deficit (visceral fat responds faster than subcutaneous)
  • Resistance training
  • Zone 2 cardio
  • Sleep optimization (poor sleep preferentially increases visceral fat)
  • Reducing refined carbs and alcohol

Sustainable Fat Loss

SustainableDeficit StrategyMuscle Retention

    Crash diets fail because they create large deficits that tank metabolism (adaptive thermogenesis) and cause muscle loss — the worst combination.

    The sustainable approach:

  • Deficit of 300–500 kcal/day (0.5–1 lb/week)
  • High protein throughout (even at maintenance)
  • Resistance training 3–4x/week to preserve muscle
  • Diet breaks every 8–12 weeks (2 weeks at maintenance) to reset leptin
  • Track food at least periodically — most people grossly underestimate intake

    • Mindset: You're not dieting. You're building a lifestyle that naturally results in a lean body composition.