Fasting and Training: How to Approach Exercise During Extended Periods Without Food

The Importance of Protein Synthesis

In order to understand how fasting affects our training, it's important to briefly touch upon the process of protein synthesis. Protein synthesis is the metabolic process that produces muscle protein, facilitating the maintenance or building of muscle mass.
If your goal is to build muscle tissue, it's ideal to have protein synthesis occurring as much as possible. Protein quality and total protein intake play a significant role in protein synthesis. The amino acid chain profile of the proteins you consume is crucial, especially if it includes all nine essential amino acids, such as L Lucine, L lysine, and L methionine.


Additionally, the amount of protein you consume throughout the day is important. A good target for maximizing muscle growth is to consume around 2-2.2 grams of protein per total kilogram of body weight. For example, if you weigh 95 kilograms, aim to consume between 200-210 grams of protein every day.

Training Strategies for Fasting

When fasting, especially during extended periods without food, it's crucial to adjust your training program accordingly. The timing of your training session plays a significant role in determining how you should approach it.


Training in the Evening or After Breaking the Fast


If you break your fast in the evening and train afterwards, there's no need to change much in your training routine. You're likely hydrated and have some food in your system, so you can train as you usually would.


Training During the Day or Before Breaking the Fast


If you prefer to train in the morning or before breaking the fast, it's important to consider a few factors that may affect your performance. Since you won't have any food in your system, you'll be using stored energy, such as glycogen, muscle tissue, and fat stores, as fuel.


Considering the lack of fuel and hydration during this time, it's best to avoid attempting personal bests or following a strength-focused or high-volume training program. Instead, focusing on lighter intensity workouts or activities that promote cardiovascular health could be more beneficial during fasting periods.

Exploring Two Fasting Approaches

When it comes to fasting, individuals have a variety of approaches to choose from. Two popular methods include the 16-hour fast and the 8-hour fast, with each offering unique benefits and challenges.

The 16-Hour Fast

For those undertaking a 16-hour fast, the typical schedule involves breaking the fast at 6:00 PM and having the last meal at 9:00 PM. This fasting period means that from 2:00 AM until 6:00 PM, the individual is in a fasted state. To optimize this approach, it's advised to consume the majority, if not all, of your daily calorie intake within a 3-hour feeding window.


While the 16-hour fast might not be the best for those looking to build muscle due to limited protein synthesis during the fasting period, it can be advantageous for individuals focusing on health benefits or weight loss.

The 8-Hour Fast (Ramadan)

During Ramadan, fasting hours are determined by sunrise and sunset. For example, with the sun setting around 6:30 PM, the fast is broken at that time, and the last pre-dawn meal might be at 5:30 AM, resulting in an 8-hour fasting period.
The challenge of the 8-hour fast during Ramadan lies in abstaining from food and water throughout the day. However, with careful planning, it's feasible to meet daily calorie requirements within an 11-hour eating window.


For those observing Ramadan, adapting sleep patterns is crucial. Breaking the fast early evening, engaging in prayers, and then resting can create opportunities for a few active daytime hours. Workout sessions can be scheduled a couple of hours after breaking the fast, with meals consumed throughout the night to sustain energy levels.


Whether opting for a 16-hour fast or adhering to the fasting routine during Ramadan, it's essential to consider individual goals, health status, and lifestyle to determine the most suitable approach for maintaining overall wellbeing.

Training Recommendations During Fasting

When it comes to training during fasting periods, it's crucial to make adjustments to suit your body's needs. This is especially true for advanced lifters who may find it more challenging to maintain muscle mass and strength during fasting.

Prioritize Resistance Training

While the focus may shift from bulking to weight maintenance during fasting, resistance training should remain a central part of your routine. Engaging in resistance training helps to sustain muscle mass and strength, which can be at risk during fasting periods.

Optimal Training Timing

For optimal results, consider scheduling your training sessions after breaking your fast. At this time, your body will have access to nutrients to support muscle repair and growth. Additionally, protein synthesis is typically higher post-meal, maximizing the benefits of your workout. Staying hydrated is also crucial for optimal performance.

Mindful Nutrition

Avoid consuming heavy or high-volume meals right before training, as this can lead to discomfort and decreased performance. Instead, opt for a balanced meal that provides adequate energy without weighing you down.

Adjust Training Volume

Due to the calorie deficit experienced during fasting, it's essential to adjust your training volume accordingly. Instead of consistently pushing your limits, focus on maintaining intensity while reducing overall volume. This approach can help prevent burnout and muscle loss during fasting periods.


By fine-tuning your training routine to accommodate the challenges of fasting, you can continue to make progress towards your fitness goals while supporting your overall health and well-being.

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