How does protein turnover differ between muscle and other organs?

While muscle accounts for a large portion of body protein, other organs like the liver, intestine, and brain have significantly higher protein turnover rates. The body recycles a large amount of amino acids daily for constant tissue renewal across all organs.

Should protein intake be increased during calorie restriction or weight loss to preserve muscle?

Yes, maintaining your absolute daily protein intake, or even increasing it, is crucial during energy restriction. This helps to attenuate muscle loss that commonly occurs when consuming fewer calories.

What is anabolic resistance and how can it be overcome in older adults?

Anabolic resistance is when older individuals show a lesser muscle protein synthesis response to the same amount of protein compared to young people. It can be largely overcome by regular physical activity, which increases muscle sensitivity to food intake.

How should overweight or obese individuals calculate their protein needs?

Protein requirements for overweight or obese people should be based on fat-free mass rather than total body weight. This is because fat mass is not metabolically active and doesn't require as much protein for turnover.

Is it better to distribute protein evenly throughout the day or consume it in larger doses in fewer meals?

It is generally advised to have an even distribution of 20-25 grams of high-quality protein in each main meal to ensure consistent anabolic stimuli. However, studies show larger meals can lead to a more prolonged anabolic response, suggesting some flexibility, especially for time-restricted eating.

Does eating protein before sleep benefit muscle growth?

Research indicates that consuming 40 grams of protein before sleep is digested and absorbed overnight, stimulating muscle protein synthesis. This can contribute to more efficient muscle reconditioning, especially for athletes training in the evening.

Can I gain muscle mass while practicing time-restricted eating?

Yes, it is possible to gain muscle mass with time-restricted eating, provided you maintain sufficient total protein intake and engage in regular resistance training. The body adapts, and a larger meal within the eating window might compensate for fewer anabolic stimuli.

How do animal and plant-based protein sources compare for muscle protein synthesis?

Animal-based proteins (meat, dairy, eggs) generally offer more rapid digestion and a complete amino acid profile. Plant-based whole foods can be harder to consume in sufficient quantities and may have lower digestibility. However, plant-based protein isolates (like pea protein), when consumed in adequate amounts, can achieve similar muscle protein synthesis rates as dairy proteins.

What is the importance of leucine for muscle protein synthesis?

Leucine is a critical amino acid that, in sufficient amounts (the 'leucine threshold'), triggers the mTOR pathway, which is essential for initiating muscle protein synthesis. Exercise lowers this threshold, making muscles more sensitive to leucine.

Are high protein diets linked to cardiovascular disease, like atherosclerosis?

While an animal study suggested a link between 22% calorie intake from protein and atherosclerosis, this translation to humans is likely an overstatement. The main issue for metabolic diseases is often excess energy intake regardless of macronutrient source, especially in sedentary individuals, not just high protein.

What is muscle memory and how does it affect regaining muscle and strength?

Muscle memory refers to the body's ability to more rapidly regain muscle mass and strength after a period of detraining if one was previously well-trained. The exact mechanisms are still debated, but it's thought to involve neuromuscular adaptations and possibly changes in muscle nuclei.

How does cold water immersion affect muscle recovery and gains after resistance training?

Immediate cold water immersion after resistance training can blunt muscle protein synthesis and glycogen restoration due to reduced blood flow and enzyme activity. It is generally advised to avoid it acutely after training for optimal muscle reconditioning, reserving it for recovery days or several hours later.

Can collagen supplements benefit tissues other than muscle, such as skin, joints, or bones?

While collagen doesn't appear to significantly increase muscle protein synthesis, it may be beneficial for collagen-rich tissues like skin, cartilage, tendons, and bones due to its high content of glycine, proline, and hydroxyproline. More research is needed to confirm its specific advantages over other protein sources for these tissues, especially after surgery or injury.

Dr. Luc Van Loon: Optimizing Protein Intake & Distribution for Muscle Growth

FoundMyFitness

Science & Technology4 min read130 min video

Jul 30, 2024|99,157 views|2,232|188

muscle protein synthesis anabolic resistance Dr. Luc van Loon protein requirements Dr. Rhonda Patrick fasting resistance training weight loss body recomposition hydrolyzed collagen atherosclerosis protein requirements to build muscle

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Key Moments

TL;DR

Dr. Luc Van Loon discusses optimal protein intake, timing, and distribution for muscle growth, highlighting exercise's role and debunking myths.

Key Insights

The recommended daily protein intake of 0.8g/kg is a minimal requirement, not optimal for muscle growth or overall health; higher intakes are generally beneficial, especially for active individuals.

Exercise significantly enhances muscle sensitivity to protein, potentially lowering the required 'anabolic resistance' threshold, making physical activity crucial for older adults.

Protein distribution throughout the day, with 20-25g per meal, is generally advised for consistent muscle protein synthesis stimulation, although larger single doses may offer prolonged benefits.

While whole foods are ideal, protein supplements can be practical for meeting increased protein needs, with whey and plant-based isolates like pea protein showing efficacy.

Cold water immersion immediately after resistance training may hinder muscle protein synthesis and recovery, suggesting a delayed or alternative timing for its use for optimizing muscle gains.

Collagen supplementation shows potential benefits for connective tissues like skin, tendons, and joints, though its direct impact on skeletal muscle protein synthesis is less clear and requires further research.

UNDERSTANDING PROTEIN REQUIREMENTS AND TURNOVER

Dr. Luc Van Loon debunks the commonly cited 0.8g/kg body weight protein recommendation, explaining it's a minimal requirement based on older nitrogen balance studies. He emphasizes that muscle tissue, like all body tissues, is in constant flux, with 1-2% turnover daily. This continuous renewal allows for adaptation, necessitating a steady supply of amino acids. While the body can adapt to lower protein intake by reducing turnover, this doesn't equate to optimal health or muscle maintenance, particularly for active individuals or those aiming for muscle growth.

EXERCISE AS A CATALYST FOR PROTEIN SENSITIVITY

Physical activity, especially resistance training, plays a pivotal role in enhancing muscle's responsiveness to protein. Exercise makes muscles more sensitive to protein intake for up to 48 hours post-session, effectively 'overcoming' anabolic resistance. This heightened sensitivity suggests that the 'anabolic resistance' often observed in older adults may be largely due to reduced activity levels rather than age alone. Therefore, regular exercise is crucial for maximizing the benefits of protein consumption, particularly in older populations.

OPTIMAL PROTEIN INTAKE AND DISTRIBUTION STRATEGIES

While the exact optimal protein intake varies, intakes between 1.2-1.6g/kg body weight are generally beneficial for muscle mass and strength gains during resistance training. Higher intakes above this are unlikely to yield further benefits for most. For consistent muscle protein synthesis, distributing protein intake evenly across meals (20-25g per meal) is recommended to provide regular anabolic stimuli throughout the day. However, recent research hints that very large single protein doses, like 100g, might prolong the stimulation period, though this is not a practical recommendation for daily intake.

THE ROLE OF PROTEIN SOURCES IN MUSCLE GROWTH

Both animal and plant-based protein sources can effectively support muscle protein synthesis, provided they deliver adequate essential amino acids, particularly leucine. While whole animal-based foods are generally well-digested and rich in essential amino acids, plant-based protein isolates, such as pea protein, have also shown comparable results in stimulating muscle protein synthesis when consumed in sufficient quantities (e.g., 30g). Blending different plant-based proteins can help create a more complete amino acid profile, compensating for individual deficiencies.

TIMING AND METHODS: EXERCISE, NUTRITION, AND RECOVERY

The timing of protein intake relative to exercise is less critical than consistent training and adequate protein supply. Exercise sensitizes muscles to protein for extended periods, making the 'anabolic window' after a workout less important than overall daily intake and distribution. For recovery, immediate cold water immersion post-resistance training may hinder muscle protein synthesis and recovery, suggesting alternative timings like on rest days or later in the day could be more beneficial for muscle growth.

COLLAGEN AND CONNECTIVE TISSUE HEALTH

While collagen is a significant component of connective tissues, its direct role in stimulating skeletal muscle protein synthesis is limited due to its amino acid profile. However, hydrolyzed collagen shows promise for supporting tissues with high collagen content, such as tendons, cartilage, skin, and bone, especially in specific conditions like post-surgery or for aiding recovery. Further research is needed to confirm the benefits of bioactive peptides and optimal dosages for these tissues, but it may serve as a valuable source of glycine and proline.

EXERCISE: THE MOST POTENT INTERVENTION

Across various discussions on nutrition, hormones, and recovery modalities, exercise consistently emerges as the most powerful intervention. It can overcome hormonal deficiencies (like in testosterone-deficient men), improve metabolic health, and promote muscle mass and strength gains even in older adults. Sedentarism, conversely, is presented as a disease state. The ability of exercise to 'forgive many sins' underscores its fundamental importance for overall health and adaptation, often overshadowing minor differences in nutritional strategies or recovery techniques.

Mentioned in This Episode

●Supplements

●Products

●Tools

●Organizations

●Studies Cited

●Concepts

●People Referenced

Protein and Exercise Optimization Checklist

Practical takeaways from this episode

Do This

Aim for 1.2-1.6 grams of protein per kilogram of body weight for muscle gain, possibly higher if very active or in energy deficit.

Distribute protein intake evenly across main meals (20-25g per meal) to maximize anabolic stimuli throughout the day.

Consider a protein-rich snack before sleep, especially after evening exercise, to support overnight muscle protein synthesis.

Prioritize physical activity, especially resistance training (at least two sessions/week), to maintain muscle mass and overcome anabolic resistance, particularly for older adults or during weight loss.

For plant-based diets, consume a diverse range of plant proteins or use a blend of plant protein isolates to ensure a complete amino acid profile.

Cook eggs for better protein digestion and absorption compared to raw eggs.

Chew food thoroughly and eat in an upright position to optimize digestion and amino acid release.

Avoid This

Don't solely rely on the minimal protein requirement (0.8 g/kg body weight) if your goal is muscle growth or preserving muscle mass.

Don't overly stress about protein timing (before or after exercise) immediately, as muscles remain sensitized for 24-48 hours.

Don't fear 'high protein' diets if you are physically active and in energy balance; excess energy, not just high macronutrient intake, is the problem.

Avoid immediate cold water immersion after resistance training, as it can blunt muscle protein synthesis. Opt for cold exposure on recovery days or several hours post-exercise instead.

Common Questions

For general health, 0.8 grams of protein per kilogram of body weight is considered a minimal requirement. However, for muscle mass gain and strength, especially in active individuals, 1.2 to 1.6 grams per kilogram of body weight is often advised. Some elite athletes may naturally consume more due to higher energy expenditure.

Topics

Protein Metabolism Leucine Threshold

Mentioned in this video

studyNitrogen Balance Studies

Historical method used to determine protein requirements by measuring nitrogen intake and excretion.

productProtein shake

A supplement that can be a convenient source of protein, especially for calorie restriction or specific sport settings.

otherRocky movies

Cited as an example of consuming raw eggs for protein, which research showed to be less effective for digestion than cooked eggs.

supplementWheat protein

A plant-based protein whose capacity to stimulate muscle protein synthesis has been assessed in research.

personLuc Van Loon

Professor at Maastricht University in Netherlands, known for contributions in exercise and nutrition, particularly protein metabolism and muscle adaptations.

organizationMike Rennie's group

The research group credited with first defining anabolic resistance.

studyNHANES data

Nutritional surveys in the United States showing typical protein distribution across meals, skewed towards evening.

conceptIntrinsically labeled protein (from cow milk)

Protein from cows infused with labeled amino acids, allowing researchers to track digestion, absorption, and incorporation into human muscle.

supplementSoy protein

A plant-based protein whose capacity to stimulate muscle protein synthesis has been assessed in research.

toolNasogastric tube

A tube inserted through the nose into the gut, used in a study to administer protein to sleeping subjects.

toolLabeled water

A method used by researchers (specifically IMA in Melbourne) to study muscle protein synthesis in the context of time-restricted eating.

supplementEgg white protein

A high-quality protein source with a good amino acid composition and rapid digestion/absorption.

treatmentADT (Androgen Deprivation Therapy)

A therapy for prostate cancer that chemically castrates patients, leading to muscle loss and increased fat mass, but these side effects can be overcome with resistance training.

personTim Snijders

A researcher in Dr. Van Loon's lab investigating the role of myonuclear content in muscle memory.

supplementPea protein

A plant-based protein extract that, when given in sufficient quantity (30g), showed no difference in muscle protein synthesis compared to dairy protein.

personKeith Barr

Professor from UC Davis who conducts in vitro research on engineered ligaments and is a colleague of Dr. Van Loon.

productspaghetti