Leangains is a fitness and nutrition methodology developed by Martin Berkhan, a nutritional consultant, personal trainer, and writer known for popularizing an approach that combines intermittent fasting with structured nutrition and resistance training. The system became particularly associated with the 16:8 fasting pattern, calorie and macronutrient cycling, and an emphasis on strength training.
Although Leangains is often described simply as an intermittent-fasting diet, Berkhan has emphasized that the method is broader than fasting alone. It incorporates meal timing, calorie intake, macronutrient composition, workout nutrition, and resistance training into one system.
The approach was developed around the goal of improving body composition—reducing body fat while maintaining or increasing muscle and strength.
Leangains became influential within the fitness community during the late 2000s and early 2010s, helping contribute to the growing popularity of intermittent fasting among people interested in physique development and strength training.
Martin Berkhan and the Development of Leangains
Martin Berkhan is the person most closely associated with the Leangains method.
According to Berkhan’s own account, his interest in intermittent fasting developed from his personal experiences with dieting and resistance training. He became dissatisfied with the conventional idea that people needed to eat small meals frequently throughout the day and began experimenting with lower meal frequency and fasting.
Berkhan has described starting intermittent fasting in 2006 and experimenting with different combinations of fasting, calorie intake, macronutrients, and training. Over time, these experiments evolved into what became the Leangains approach.
His background includes a bachelor’s degree in Medical Sciences and Education, with a major in Public Health Sciences, although he has also described much of his nutrition and weight-training knowledge as self-taught.
The Leangains website subsequently became a major platform for Berkhan’s writing about intermittent fasting, nutrition, strength training, and body composition.
The 16:8 Fasting Structure
One of the most recognizable characteristics of Leangains is its 16-hour fasting and 8-hour feeding schedule.
Under the traditional framework, a person spends approximately 16 hours without caloric food intake and consumes their meals during an 8-hour feeding period. Berkhan described examples such as eating between 1 p.m. and 9 p.m. or using another schedule that fits the individual’s lifestyle.
The schedule is often summarized as:
16 hours fasting → 8 hours feeding
This is why Leangains is commonly associated with the broader category of 16:8 intermittent fasting.
However, Berkhan’s approach places considerably more emphasis on what happens within the feeding window than a simple fasting schedule does. Calories, protein, carbohydrates, fats, and workout timing all form part of the methodology.
Fasting Is Only One Part of Leangains
It is important to distinguish Leangains from intermittent fasting in general.
Intermittent fasting is an umbrella term covering many different approaches to restricting the timing of food intake. These can include alternate-day fasting, shorter daily eating windows, occasional 24-hour fasts, and other patterns.
Berkhan’s original description of Leangains specifically positioned it as a fitness-oriented approach. He noted that, compared with other intermittent-fasting systems, Leangains placed greater emphasis on pre- and post-workout nutrition, calorie cycling, macronutrient composition, and meal timing.
This distinction is important because someone following a generic 16:8 schedule is not necessarily following the Leangains methodology.
Calorie Cycling
Another important feature of Leangains is calorie cycling.
Instead of necessarily eating exactly the same number of calories every day, the approach traditionally adjusts calorie intake according to whether the day involves training.
Berkhan’s earlier descriptions of the method explain that calorie and macronutrient intake is cycled, with nutritional intake generally higher on training days and lower on rest days.
The idea is to align greater nutritional intake with periods when the body is being challenged by resistance training.
For example, a person’s weekly calorie intake could be distributed differently across workout and rest days while still producing the desired overall energy balance.
This makes Leangains more structured than simply skipping breakfast and eating during an eight-hour window.
Macronutrient Cycling
Leangains also emphasizes macronutrient cycling.
The three major macronutrients are:
- Protein
- Carbohydrates
- Fat
Traditional Leangains recommendations vary the relative amounts of carbohydrates and fats depending on the type of day. Berkhan has described workout days as emphasizing carbohydrates, while rest days generally involve relatively higher fat intake.
Protein remains particularly important because maintaining adequate protein intake supports muscle retention and development during periods of calorie restriction or body recomposition.
The exact nutritional requirements of an individual, however, depend on factors such as body size, activity level, training experience, goals, and overall calorie intake.
Resistance Training
Leangains is not simply a diet.
Resistance training is a central component of the methodology.
The approach was designed for people interested in getting leaner while maintaining or building strength and muscle. Berkhan has frequently emphasized heavy resistance training as part of his approach.
Compound movements are particularly relevant to the style of training associated with Leangains.
Exercises such as:
- Squats
- Deadlifts
- Bench presses
- Pull-ups or chin-ups
- Rows
- Overhead presses
can form the foundation of a strength-focused training program.
The precise exercise selection and programming can vary, but the underlying principle is progressive resistance training rather than using exercise simply as a way to burn calories.
Reverse Pyramid Training
One training approach strongly associated with Berkhan is Reverse Pyramid Training (RPT).
In conventional pyramid training, a lifter may begin with lighter weights and increase the load across successive sets.
Reverse pyramid training generally works in the opposite direction: the heaviest working set is performed first, followed by sets using progressively lighter weights.
Berkhan has frequently discussed RPT as his preferred training approach.
The method places an emphasis on performing demanding sets while the lifter is relatively fresh. Subsequent sets can use reduced loads as fatigue accumulates.
The approach is particularly suited to people who prefer relatively efficient, strength-focused workouts rather than extremely high training volume.
Workout Nutrition
The timing of food around resistance training is another defining feature of Leangains.
Berkhan has historically recommended keeping pre-workout nutrition relatively limited while placing a large proportion of daily calorie intake after training.
The reasoning behind this structure is to concentrate nutritional intake around training and recovery.
In one description of his approach, Berkhan explained that on workout days the majority of calories would be consumed after the training session.
This differs from traditional bodybuilding advice that often emphasized frequent meals throughout the day.
Fasted Training
Leangains has also been associated with fasted training, although the exact protocol can vary.
Berkhan’s earlier writing described training near the end of the fasting period and then consuming the largest meal or meals after the workout.
Historically, his fasted-training protocol also involved the use of branched-chain amino acids or similar amino-acid products before or around training.
This part of the methodology has generated considerable discussion within the fitness community, particularly as understanding of protein intake, muscle protein synthesis, and fasted exercise has developed.
The existence of the protocol should therefore be distinguished from claims that everyone needs to train while fasted. Individual responses to training and fasting can differ considerably.
Body Recomposition
One of the concepts closely associated with Leangains is body recomposition.
Body recomposition refers to reducing body fat while maintaining or increasing lean body mass.
Traditional dieting often focuses primarily on losing weight, while bulking focuses on gaining body weight and muscle. Recomposition instead aims to improve the ratio between muscle and fat.
Berkhan has described using cycles of calorie restriction, maintenance intake, and calorie surplus while manipulating macronutrients and continuing resistance training.
The concept became particularly attractive to people who wanted to look leaner and more muscular without following long periods of aggressive bulking and cutting.
Leangains and Fat Loss
Leangains is often used for fat-loss goals.
The fasting period can provide a straightforward eating structure for people who prefer larger meals and fewer eating occasions. Rather than planning food throughout the entire day, followers can concentrate their meals within a defined feeding window.
However, fasting itself does not eliminate the importance of overall energy intake.
A person generally loses body weight when sustained energy expenditure exceeds energy intake. Leangains attempts to organize that energy intake around a specific daily structure while incorporating resistance training and high-protein nutrition.
The approach can therefore be understood as a method of organizing diet and training, rather than a special mechanism that makes fat loss independent of calorie balance.
Leangains for Muscle Gain
Although the name is strongly associated with getting lean, Leangains is not exclusively a fat-loss system.
Berkhan’s early experiments included periods of increased calorie intake designed to gain muscle while limiting unnecessary fat gain. In his account of his early experiments, he described using an eight-hour feeding window even during a period of higher calorie intake.
This illustrates an important principle of the system: the fasting schedule can remain relatively consistent while total calories and macronutrient intake change according to the objective.
Someone seeking muscle gain may therefore require a calorie surplus, while someone seeking fat loss may require a calorie deficit.
Leangains and Meal Frequency
A central idea behind Leangains is that people do not necessarily need to eat constantly throughout the day.
Berkhan developed the approach partly in response to his own experience with frequent meals. He has written that frequent feeding became difficult for him and that reducing meal frequency allowed him to feel less preoccupied with food.
Traditional Leangains schedules often use approximately three meals within the feeding window, although Berkhan has noted that some people may prefer two or four meals.
The emphasis is therefore not simply on eating as little as possible but on concentrating food intake into fewer, larger meals.
The Leangains Method Book
Berkhan eventually formalized his approach in The Leangains Method – The Art of Getting Ripped. Researched, Practiced, Perfected.
The book was announced in 2018 and became the primary published reference for the method. Berkhan’s official website describes the book as covering fat loss, nutrition, training, and the broader philosophy behind his approach.
The book is important because it moves Leangains beyond a simple 16:8 schedule.
It presents the methodology as a more comprehensive approach involving nutrition, resistance training, body composition, and behavioral considerations.
Why Leangains Became Popular
Leangains became popular partly because it challenged several conventional fitness-diet assumptions.
At a time when eating many small meals was widely promoted within fitness circles, the idea of intentionally skipping breakfast and eating fewer, larger meals appeared unconventional.
The approach also appealed to people who disliked constantly planning meals.
For someone who naturally prefers eating larger meals later in the day, a restricted feeding window can feel easier to follow than a schedule requiring food every few hours.
Berkhan’s focus on strength training also differentiated Leangains from fasting approaches designed primarily around weight loss.
Leangains and Modern Intermittent Fasting
Leangains occupies an important place in the history of modern intermittent fasting.
Berkhan began publicly discussing intermittent fasting and his approach in the mid-2000s, before intermittent fasting became as mainstream as it is today. His website describes Leangains as having helped drive the popularity of intermittent fasting within the fitness community.
Today, 16:8 fasting is widely recognized outside the Leangains community and is used by people with many different dietary goals.
However, not every 16:8 diet is Leangains.
The distinguishing feature is the combination of fasting with structured calorie and macronutrient intake and resistance training.
Considerations and Limitations
Leangains is a structured approach, but it is not necessarily appropriate for everyone.
Fasting can be uncomfortable for people who prefer frequent meals or who have schedules that make a restricted eating window impractical.
People with certain medical conditions, those taking medications affected by food intake, pregnant or breastfeeding individuals, and people with a history of eating disorders should seek appropriate professional guidance before deliberately restricting food intake or adopting a fasting regimen.
Training demands also vary. A nutrition and training strategy suitable for an experienced lifter may not be appropriate for someone completely new to resistance training.
It is also important to distinguish the methodology itself from individual claims about fasting. Research on intermittent fasting continues to evolve, and fasting should not automatically be assumed to provide superior results to every other dietary approach.
Conclusion
Leangains is a fitness and nutrition methodology created by Martin Berkhan that combines intermittent fasting with structured nutrition and resistance training.
Its traditional framework centers on a 16-hour fasting period and an 8-hour feeding window, accompanied by calorie and macronutrient cycling. Workout days generally receive greater nutritional emphasis, particularly around resistance training, while rest days use a different calorie and macronutrient distribution.
Resistance training is fundamental to the approach, with heavy compound movements and techniques such as Reverse Pyramid Training closely associated with Berkhan’s philosophy.
What distinguishes Leangains from a generic intermittent-fasting schedule is this broader integration of fasting, calories, macronutrients, meal timing, and strength training.
The method has had a lasting influence on the fitness community and helped popularize the idea that intermittent fasting could be combined with serious resistance training and physique development rather than being viewed solely as a weight-loss strategy.