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Callum Parker
November 28, 2025

How to Lose Fat and Build Muscle at the Same Time

Learn how to lose fat and build muscle at the same time using strength training, smart nutrition, and accurate DEXA Scan body composition tracking.

Author
5 min read
How to Lose Fat and Build Muscle at the Same Time

Most people think you need to choose between losing fat or building muscle. The reality is that you can do both at the same time through a process called body recomposition. It requires the right training, the right nutrition, and accurate feedback on how your body is actually changing.

At Kalos, we use DEXA Scan technology to track recomposition with precision. This allows clients to see exactly how much fat they are losing and how much muscle they are gaining, eliminating the guesswork that comes from using weight alone.

Here is how to transform your body from both sides at once.

What Is Body Recomposition?

Body recomposition means:

  • Lowering fat mass
  • Increasing lean muscle mass
  • Improving definition and symmetry
  • Enhancing strength, metabolism, and performance

Instead of focusing on the scale, the goal is to improve the ratio of fat to muscle. This creates a leaner, more athletic, and healthier physique.

The Three Pillars of Losing Fat and Building Muscle

1. Train With a Strength Focus

Strength training is the engine of recomposition. You need to challenge your muscles enough to stimulate growth.

Aim for:

  • 3 to 4 strength sessions per week
  • A mix of compound movements
  • Progressive overload
  • Good form and full range of motion

When you gain muscle, your metabolism improves and fat loss becomes easier.

2. Eat at or Slightly Below Maintenance with High Protein

Nutrition is where most people fail recomposition. You need enough energy to build muscle but a small deficit to burn fat.

The ideal structure is:

  • Calories at maintenance or 10 percent below
  • Protein at 0.8 to 1.0 grams per pound of body weight
  • Balanced carbs for training performance
  • Healthy fats for hormone support

This allows your body to use stored fat for energy while using your food intake to fuel muscle repair.

3. Track Your Body Composition to Stay on Target

This is where a DEXA Scan becomes essential.

With DEXA you can measure:

  • Fat mass
  • Lean mass
  • Visceral fat
  • Regional muscle distribution

If your fat is dropping and muscle is rising, your plan is working. If one moves in the wrong direction, you can adjust quickly.

Why the Scale Will Mislead You During Recomposition

You can lose 6 lbs of fat and gain 4 lbs of muscle and see almost no change on the scale. But physically, your body will look completely different.

This is why recomposition often feels like slow progress unless you use proper measurements.

DEXA data reveals the changes the scale hides.

Step by Step: How to Lose Fat and Build Muscle Simultaneously

Step 1: Strength Train Consistently

Prioritize progressive overload with exercises like:

  • Squats
  • Deadlifts
  • Rows
  • Presses
  • Pull ups
  • Hip hinges
  • Lunges

These movements build the most muscle in the shortest time.

Step 2: Increase Daily NEAT

Walking 8 to 12 thousand steps daily increases calorie burn without hurting recovery.

This helps fat loss while preserving muscle.

Step 3: Get Enough Protein Every Day

Protein is essential for recovery and muscle growth.

Aim for 25 to 40 grams per meal.

Step 4: Sleep 7 to 9 Hours Nightly

Sleep affects:

  • Hormones
  • Fat loss
  • Muscle repair
  • Hunger regulation

You cannot recomp properly with poor sleep.

Step 5: Manage Stress

High cortisol makes it harder to lose fat and easier to lose muscle.

Use:

  • Light walking
  • Deep breathing
  • Stretching
  • Structured rest days

Step 6: Monitor Progress With Regular DEXA Scans

Track every 4 to 8 weeks to measure changes in:

  • Lean mass
  • Fat mass
  • Symmetry
  • Visceral fat

Adjust your training or nutrition based on the data.

Who Is Recomposition Best For?

Recomposition works exceptionally well for:

  • Beginners
  • People returning after a break
  • People who have been under eating or over dieting
  • Anyone who has not been training consistently
  • Overweight individuals with moderate to high body fat

Intermediate and advanced lifters can still recomp, but it requires more precision.

Real World Example

A Kalos client trained three times per week and increased protein intake while staying near maintenance calories. Over 12 weeks, their DEXA scans showed:

  • 5.4 lbs fat lost
  • 3.1 lbs lean muscle gained
  • Significant improvements in waist and limb measurements

The scale barely moved, but their physique and performance changed dramatically.

The Bottom Line

You absolutely can lose fat and build muscle at the same time. The key is balancing strength training, nutrition, daily movement, and recovery, while using DEXA Scan data to guide your adjustments.

This approach creates sustainable, long lasting changes that look and feel like a true transformation.

Book Your DEXA Scan with Kalos Today in Downtown San Francisco or Palo Alto!

If you are ready to take control of your health with the most accurate body composition analysis available, it is time to book your DEXA scan at Kalos. Whether you are looking to get lean, build muscle, improve performance, or optimize longevity, our advanced technology and expert guidance will help you get there.

Schedule your scan today at Kalos, your journey to data-driven fitness starts now.

Schedule your DEXA scan today!

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