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The Synergistic Benefits of Combining Intermittent Fasting with CrossFit Training

Jose Pita
2 min readOct 7, 2023

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As our understanding of fitness and nutrition deepens, we continually seek ways to maximize our potential and push the boundaries of human performance.

Two practices that have garnered significant attention in recent years are intermittent fasting and high-intensity interval training (HIIT). And when you combine them – using CrossFit as our basis for HIIT – the results can be transformative.

Here’s why:

1. Optimized Fat Burning

Both intermittent fasting and CrossFit prioritize the utilization of stored fat for energy.

Intermittent Fasting (IF): During the fasting window, insulin levels drop, prompting the body to access stored fat as its primary fuel source.

CrossFit: As a form of HIIT, CrossFit creates an afterburn effect known as Excess Post-exercise Oxygen Consumption (EPOC). This means your body continues to burn calories at an accelerated rate even after your workout has concluded.

2. Improved Metabolic Flexibility

Metabolic flexibility refers to the body’s ability to efficiently switch between using carbs or fats as its primary energy source.

IF: Regular fasting trains the body to use fat more efficiently during periods of low food availability.

CrossFit: The varied, high-intensity nature of CrossFit workouts demands energy from both carbs (for immediate, explosive energy) and fats (for sustained energy).

3. Enhanced Cognitive Function

Both Intermittent Fasting and CrossFit have been linked to improved brain health.

IF: Fasting boosts the production of brain-derived neurotrophic factor (BDNF), a protein linked to improved brain function and reduced risk of neurodegenerative diseases.

CrossFit: Regular exercise, especially HIIT, increases blood flow to the brain, improving cognitive function and potentially slowing the brain’s aging process.

4. Growth Hormone Production

Both practices stimulate the natural production of growth hormone, crucial for muscle development and recovery.

IF: Fasting can spike growth hormone levels, aiding in muscle preservation and repair.

CrossFit: The physical stress from a HIIT workout stimulates the pituitary gland to produce more growth hormone.

5. Autophagy Stimulation

Autophagy is the body’s way of cleaning out damaged cells and regenerating newer, healthier ones.

IF: Extended periods without food can initiate autophagy, helping rid the body of cellular waste.

CrossFit: Exercise-induced oxidative stress can also promote autophagy, further enhancing the body’s self-cleaning process.

The marriage of intermittent fasting and CrossFit offers a comprehensive approach to wellness, merging the nutritional benefits of controlled eating windows with the unparalleled fitness gains of high-intensity functional movements.

As always, consult with health professionals before embarking on any new fitness or dietary regimen. I’m not in the mood to be responsible for your health choices 😊

For those seeking an edge in performance, recovery, and overall health, this powerful combination may well be the answer.

Part 2, the personal journey link😎

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Jose Pita

Fingers bouncing furiously across impatient keys with the hope that someday someone might read these tales and think on the writers wishes