Body Composition

Fat loss, muscle gain, and body recomposition.

Understanding Body Composition

Body composition = the ratio of fat mass to lean mass (muscle, bone, organs, water).

Weight alone doesn't tell the story:

• 200 lbs at 15% body fat looks vastly different than 200 lbs at 25% body fat
• You can weigh the same but look leaner by building muscle and losing fat

Goals should focus on composition, not just weight.

Body Fat Percentage Guide

Men

Women

Note: Women naturally carry more essential fat (reproductive health).

Target Body Fat

Very low body fat (<10% men, <18% women) can cause:

• Hormonal issues
• Low testosterone
• Amenorrhea (women)
• Poor sleep
• Low energy
• Impaired immune function

Measuring Body Composition

Methods Ranked by Accuracy

Best Approach

For tracking progress:

1. Take weekly progress photos (same lighting, time, pose)
2. Track weight weekly (same day/time)
3. Measure waist, hips, chest, arms, legs
4. Optional: Get DEXA/Bod Pod every 3-6 months

Don't obsess over exact number. Track trends.

Fat Loss

The Only Rule That Matters

Calorie deficit = fat loss

Every successful diet works through this mechanism. Everything else is strategy to help you maintain the deficit.

How to Create a Deficit

Calculate TDEE (see 01-fundamentals.md)

Choose deficit:

Safe rate: 0.5-1% bodyweight per week

Example:

• 200 lb person: 1-2 lbs/week max
• 150 lb person: 0.75-1.5 lbs/week max

Macros for Fat Loss

Protein: 1-1.2g/lb bodyweight (highest priority)

• Preserves muscle
• High satiety
• High thermic effect

Fat: 0.3-0.4g/lb bodyweight (minimum)

• Hormonal health

Carbs: Fill remaining calories

• Adjust based on preference and activity level

Example: 180 lb person, 2,000 calories

• Protein: 180g × 4 = 720 cal (36%)
• Fat: 60g × 9 = 540 cal (27%)
• Carbs: (2,000 - 1,260) ÷ 4 = 185g (37%)

Strategies for Adherence

Diet fatigue is real. Use these strategies:

1. Diet breaks: Every 6-12 weeks, eat at maintenance for 1-2 weeks
2. Refeed days: 1-2x/week, higher carbs (at maintenance)
3. Flexible dieting: 80/20 rule (strict 80%, flexible 20%)
4. High-volume, low-calorie foods: Vegetables, lean protein
5. Protein at every meal: Satiety and muscle preservation
6. Plan treats: Don't restrict completely, leads to binges

Training During Fat Loss

Lift weights 3-4x/week:

• Maintain muscle
• Signal body to keep muscle
• Don't reduce volume, reduce intensity if needed

Cardio:

• Not required for fat loss
• Can help create deficit
• Low-intensity (walking) is sustainable
• 150-300 min/week if used

Don't:

• Massively increase training volume
• Do excessive cardio
• Both increase injury risk and hunger

Expected Timeline

Starting point matters:

Expect:

• First 2 weeks: Rapid loss (water weight)
• Then: Steady 0.5-1% bodyweight/week
• Last 10 lbs: Slower, 0.5 lb/week

Muscle Building

The Requirements

1. Calorie surplus: 200-300 over TDEE
2. Adequate protein: 0.8-1g/lb bodyweight
3. Progressive overload: Lift heavier over time
4. Consistency: Years, not months

How Fast Can You Build Muscle?

Realistic natural rates (with optimal training and nutrition):

Monthly: 0.5-1 lb (beginners), 0.25-0.5 lb (advanced)

Don't expect more than this naturally. Claims of 20 lbs in 3 months are:

• Water/glycogen
• Fat gain
• Newbie gains
• Enhanced (steroids)

Macros for Muscle Building

Protein: 0.8-1g/lb bodyweight

Surplus: 200-300 calories

• More = unnecessary fat gain
• Less = suboptimal muscle growth

Carbs: Higher for energy and performance

• 2-3g/lb bodyweight for active individuals

Fat: 0.3-0.4g/lb minimum

Example: 180 lb person, 2,800 calories

• Protein: 180g × 4 = 720 cal
• Fat: 70g × 9 = 630 cal
• Carbs: (2,800 - 1,350) ÷ 4 = 362g

Training for Muscle Building

Frequency: 3-6 days/week

Volume: 10-20 sets per muscle group per week

Intensity: 6-12 reps per set (primarily)

Progressive overload: Add weight, reps, or sets over time

Compound movements priority:

• Squat
• Deadlift
• Bench press
• Overhead press
• Rows
• Pull-ups

Bulk Types

Recommendation: Lean bulk. Minimizes fat gain, easier to stay lean.

Expected Fat Gain

Accept some fat gain when building muscle:

• Lean bulk: ~1 lb fat per 2 lbs gained
• Standard bulk: ~1:1 ratio

If you're gaining more than 1 lb/week consistently, you're adding unnecessary fat.

Body Recomposition (Recomp)

Goal: Build muscle AND lose fat simultaneously

Reality: Difficult but possible in specific situations

Who Can Recomp?

Best candidates:

1. Beginners (untrained)
2. Returning after layoff (muscle memory)
3. Overweight with some muscle (15%+ body fat)
4. Enhanced athletes (steroids)

Difficult for:

• Advanced lifters
• Already lean (<12% men, <20% women)
• Those who've been training for years

How to Recomp

Eat at maintenance or slight deficit (-100 to -200 cal)

High protein: 1-1.2g/lb bodyweight

Train hard:

• Progressive overload
• 4-5x/week lifting
• Full body or upper/lower split

Patience:

• Slower than dedicated bulk or cut
• May take 6-12 months to see significant change

Track:

• Body measurements
• Progress photos
• Strength gains
• Weight (may stay similar)

Recomp vs Bulk/Cut Cycles

For most people: Bulk/cut cycles are more efficient long-term.

Cutting vs Bulking: When to Do What

Start with a Cut If:

• Over 20% body fat (men)
• Over 30% body fat (women)
• Want to see abs first
• Health markers poor

Benefit: Build from lean base, better nutrient partitioning

Start with a Bulk If:

• Under 12% body fat (men)
• Under 20% body fat (women)
• Very skinny
• Want to build strength base

The Lean Bulk/Cut Cycle

Example approach:

1. Cut to 10-12% (men) or 18-20% (women)
2. Lean bulk to 15% (men) or 25% (women)
3. Cut back down
4. Repeat

Cycle length:

• Bulk: 3-6 months
• Cut: 2-4 months
• Maintain: 4-8 weeks between phases

Common Mistakes

Fat Loss Mistakes

1. Deficit too large: Lose muscle, unsustainable
2. Too little protein: Lose muscle
3. No strength training: Lose muscle
4. Excessive cardio: Fatigue, hunger, muscle loss risk
5. Eliminating food groups: Unnecessary restriction
6. Not tracking: "I'm eating healthy but not losing weight"
7. Expecting linear progress: Weight fluctuates daily
8. Quitting too soon: Takes 12-16 weeks minimum

Muscle Building Mistakes

1. Not eating enough: No surplus = no growth
2. Too much surplus: Unnecessary fat gain
3. Insufficient protein: Can't build without materials
4. Poor training program: Random workouts don't work
5. No progressive overload: Must increase demand on muscles
6. Expecting rapid gains: Muscle builds slowly
7. Dirty bulking: Getting fat doesn't build more muscle
8. Not tracking: Guessing calories and protein

Special Scenarios

Skinny-Fat (Low Muscle, High Fat)

Best approach:

1. Start with slight deficit or maintenance
2. Prioritize lifting (beginner gains)
3. High protein (1g/lb+)
4. Recomp for 6-12 months
5. Then lean bulk

Very Overweight (30%+ body fat)

Best approach:

1. Focus on fat loss first
2. Moderate deficit (-500 cal)
3. Start lifting (preserve/build muscle)
4. Get to 15-20% body fat
5. Then decide bulk or cut

Advanced Lifter Plateau

Options:

1. Longer, slower bulks (6-12 months)
2. Accept slower progress (2-3 lbs muscle/year)
3. Maintenance phases between bulk/cut
4. Optimize training (likely the issue, not nutrition)

Realistic Expectations

One Year of Proper Training and Nutrition

Starting overweight (25% BF):

• Lose 20-30 lbs fat
• Gain 5-10 lbs muscle
• Transform appearance

Starting skinny (140 lbs):

• Gain 15-20 lbs (mostly muscle)
• Significant strength gains
• Fill out frame

Starting average:

• Lose 10-15 lbs fat OR
• Gain 10-15 lbs muscle
• Much better physique

Three Years

With consistency:

• 30-40 lbs muscle gain (men)
• 15-20 lbs muscle gain (women)
• Excellent physique if lean
• Strong foundation

Natural Limit

Men:

• ~170-180 lbs lean at 5'10"
• ~190-200 lbs lean at 6'0"

Women:

• ~120-130 lbs lean at 5'4"
• ~135-145 lbs lean at 5'7"

"Lean" = 10-12% men, 18-20% women

Takes 5-10 years of consistent training and nutrition.

The Bottom Line

Fat Loss:

• Calorie deficit
• High protein
• Lift weights
• Patience

Muscle Gain:

• Calorie surplus
• High protein
• Progressive overload
• Patience

Recomp:

• Maintenance calories
• Very high protein
• Hard training
• Lots of patience

Choose your goal, commit for months, track progress, adjust as needed.