05/19/2025
WHY AM I GAINING WEIGHT AFTER STARTING EXERCISE?
Why Do People Gain Weight Initially?
It’s common to experience slight weight gain in the first few weeks of starting a fitness program, especially one involving resistance training. This temporary gain is not a sign of failure but part of your body’s natural adaptation process.
The Reasons for Initial Weight Gain
Micro-Trauma and Inflammation:
• Resistance training causes tiny tears in muscle fibers (micro-trauma).
• Your body initiates a healing process that results in temporary inflammation.
• To repair the muscle, your body retains fluid around the damaged areas, leading to water weight gain.
• Increased Glycogen Storage:
o When you exercise regularly, your body stores more glycogen to fuel your workouts.
o Glycogen binds with water in a 1:3 ratio (1 gram of glycogen binds with 3 grams of water). This combination adds weight, but it’s a healthy and necessary process to improve energy levels for exercise.
Delayed-Onset Muscle Soreness (DOMS)
• DOMS occurs 1-2 days after a workout and is a natural response to the micro-tears in muscle tissue.
• This soreness is a sign that your muscles are adapting to the new stress and building strength.
Why These Changes Are Temporary
• Water Retention Reduces Over Time
• As your muscles adapt to exercise, they experience less micro-trauma and inflammation.
• Your body retains less fluid, and water weight begins to drop.
• Efficiency in Energy Usage:
o Initially, your muscles store more glycogen to fuel exercise.
o Over time, as your body becomes more efficient, it requires less glycogen to maintain the same energy output.
o This reduction in glycogen storage means less water is bound to your muscles, leading to weight stabilization or loss.
• Expect an initial fluctuation in weight (1-5 pounds depending on body size).
• After a few weeks, water retention decreases, and muscle efficiency improves.
• With consistent effort in exercise and proper nutrition, weight loss and body composition changes will follow.
Important Tips for Managing Expectations
• Don’t Panic: Weight gain initially is temporary, not fat gain.
• Track Progress Beyond the Scale: Use measurements, photos, or how clothes fit to monitor progress.
• Carbohydrates and Recovery:
o Avoid restricting carbs completely, as they’re essential for replenishing glycogen stores.
o Consume healthy carbs after workouts to support recovery and energy levels.
Key Takeaway
When starting a fitness program, initial weight gain is normal and results from inflammation and glycogen storage. As you train consistently, your body will adapt, leading to fat loss and improved fitness. Trust the process!