#093 Dr. Luc van Loon: Optimizing Protein Intake & Distribution for Muscle Growth
Dr. Luke Van Loon, a professor at Maastricht University, discusses optimal protein intake and distribution for muscle protein synthesis, strategies to combat anabolic resistance, and the effects of cold water immersion and collagen on muscle adaptation.
Deep Dive Analysis
19 Topic Outline
Introduction to Protein's Indispensable Role in Biology
Understanding Protein Turnover and Established Requirements
Protein Requirements for Resistance Training and Weight Loss
Anabolic Resistance and the Role of Physical Activity
Calculating Protein Needs for Overweight and Obese Individuals
Distinguishing Between Strength Gains and Muscle Mass Increases
Optimal Protein Distribution Throughout the Day
Impact of Large Protein Doses and Evening Protein Consumption
Time-Restricted Eating and Muscle Protein Synthesis
Timing Protein Intake Around Exercise Sessions
Comparing Protein Sources: Shakes vs. Whole Foods
Whey vs. Casein and Factors Influencing Anabolic Potential
Raw vs. Cooked Eggs and Plant vs. Animal Protein
Protein Isolates vs. Concentrates and Leucine Threshold
High Protein Diets and Atherosclerosis Concerns
Muscle Adaptations, Memory, and Training Frequency
Resistance Training for Older Adults and Hormonal Changes
Impact of Cold Water Immersion on Muscle Protein Synthesis
Collagen Supplementation for Connective Tissue and Skin Health
5 Key Concepts
Protein Turnover
All living tissues, including skeletal muscle, are constantly being synthesized and broken down. This continuous renewal process requires protein (amino acids) and allows tissues to adapt to use, such as growing larger with bodybuilding or shrinking with disuse.
Nitrogen Balance
A method used to determine protein requirements by measuring the balance between nitrogen intake (from protein) and nitrogen excretion (as urea in urine). A neutral balance was historically assumed to indicate sufficient intake, but this method has methodological issues and doesn't account for adaptation.
Anabolic Resistance
A phenomenon where older individuals show a lesser stimulation of muscle protein synthesis from the same amount of protein intake compared to younger individuals. Much of this resistance can be overcome by engaging in physical activity.
Leucine Threshold
The specific amount of leucine (an amino acid) required to maximally stimulate muscle protein synthesis after a meal. Exercise makes the muscle more sensitive to protein feeding, effectively reducing this threshold.
Muscle Memory
The idea that individuals who were previously athletic can regain muscle mass and strength more rapidly after a period of inactivity compared to those without prior training. This is potentially explained by genetics, neuromuscular adaptations, or the maintenance of an increased number of nuclei in muscle fibers.
15 Questions Answered
Protein is crucial because all living tissues, including muscle, are constantly being synthesized and broken down. This continuous renewal process, which occurs at a rate of 1-2% per day for muscle, requires a constant supply of protein's building blocks, amino acids, to maintain and adapt tissues.
The RDA was primarily established through nitrogen balance studies, where researchers measured nitrogen intake versus excretion. It represents a minimal requirement to maintain a neutral nitrogen balance over one to two weeks on a provided diet, but it may not reflect optimal requirements or account for individual adaptations.
While the optimal amount isn't definitively known, consuming 1.2 to 1.6 grams of protein per kilogram of body weight per day tends to result in greater gains in muscle mass and strength for resistance-trained individuals. Going higher than 1.6 g/kg is generally not considered necessary.
Anabolic resistance means older individuals show a reduced muscle protein synthesis response to the same amount of protein compared to younger people. However, much of this resistance can be overcome by regular physical activity, which increases muscle sensitivity to protein.
Protein requirements should ideally be based on fat-free mass rather than total body weight, as fat mass is less metabolically active. Most people can estimate their excess fat and adjust their calculation accordingly, or use methods like DEXA scans for a more precise measurement.
Theoretically, it's most beneficial to have an even distribution of protein, with 20-25 grams at each main meal (breakfast, lunch, dinner) to provide consistent anabolic stimuli. However, the body is adaptable, and total daily protein intake and consistent training are more critical than precise distribution.
Yes, studies have shown that consuming 40 grams of protein in the evening, even while sleeping, is digested, absorbed, and stimulates muscle protein synthesis overnight, contributing to more efficient muscle reconditioning.
Yes, muscle mass can be gained with time-restricted eating, provided that total daily protein intake is maintained and individuals are consistently engaged in resistance training. The body can adapt to consuming larger protein boluses within a shorter eating window.
It doesn't significantly matter whether protein is consumed immediately before or after exercise because resistance training sensitizes muscle to amino acids for up to 24-48 hours. Consistency of training and overall protein intake across meals is more important.
Whey protein is generally more effective for stimulating muscle protein synthesis due to its more rapid digestion and absorption, and higher leucine content. Casein is a slower-digesting protein, but differences are minimal in the context of a full day's diet.
Cooking eggs denatures the protein, leading to more rapid digestion and absorption of amino acids compared to raw eggs. While this theoretically should lead to greater muscle protein synthesis, if sufficient protein is consumed, the total muscle protein synthesis response may be similar.
Whole plant-based foods often make it harder to get sufficient protein due to lower protein density and anti-nutritional factors reducing digestibility. However, plant-derived protein isolates (like pea protein) can stimulate muscle protein synthesis comparably to dairy protein if sufficient amounts (e.g., 30 grams) are consumed, especially if they are blends with balanced amino acid profiles.
Current evidence does not support that high-protein diets, in themselves, cause atherosclerosis in humans. Concerns often arise from misinterpretations of animal studies or acute human data. The primary issue for metabolic diseases is excess energy intake, regardless of macronutrient source, especially in sedentary individuals.
Yes, if performed immediately after resistance training, cold water immersion can blunt muscle protein synthesis. It inhibits muscle perfusion and reduces enzyme activity, compromising the acute recovery phase and potentially leading to measurable reductions in total protein synthesis over weeks.
Studies have not shown that collagen ingestion increases mixed muscle protein synthesis or connective tissue protein synthesis in muscle, likely due to its lower essential amino acid content. However, it may be more relevant for tissues with a higher collagen content like cartilage, bone, tendons, ligaments, and skin, especially after surgery or injury, but more research is needed.
53 Actionable Insights
1. Prioritize Consistent Resistance Training
Make consistent resistance training the baseline of your fitness routine, as it is the most essential factor for muscle adaptation and overall health, even more important than minor protein distribution worries.
2. Overcome Anabolic Resistance with Activity
Engage in physical activity, such as an exercise session before food intake, to significantly overcome anabolic resistance, especially important for older adults to improve muscle’s response to protein.
3. Exercise Mitigates Hormonal Changes
Leverage resistance exercise to fully overcome the negative effects of hormonal changes (e.g., menopause, androgen deficiency therapy) on muscle mass and strength, as exercise is a more potent stimulus than hormonal shifts.
4. View Sedentarism as a Disease
Shift your mindset to view sedentarism as a disease, and physical activity as the necessary antidote, rather than just a ‘medicine,’ to align with the body’s natural need for movement.
5. Avoid Excess Energy Intake
Prevent chronic metabolic diseases by avoiding excess energy intake from any macronutrient (glucose, fat, or protein), as oversupply of nutrients can lead to resistance and health issues.
6. Maintain Protein During Calorie Restriction
When undergoing energy restriction for weight loss, maintain your absolute daily protein intake to attenuate muscle mass decline, as the body adapts to a certain amount of protein and sudden reductions can impact muscle.
7. Increase Protein for Muscle Gain
For muscle mass and strength gains, especially with resistance training, consume more protein than the minimal recommended amount, aiming for 1.2 to 1.6 grams of protein per kilogram of body weight daily.
8. Distribute Protein Evenly Per Meal
Optimize muscle conditioning by distributing protein evenly throughout the day, aiming for 20 to 25 grams of high-quality protein in each main meal (breakfast, lunch, and dinner) to provide consistent anabolic stimuli.
9. Exercise at Any Age
Engage in exercise regardless of age, as muscle turnover (breakdown and synthesis) occurs daily even at 85, and exercise is the only way to maintain or increase muscle mass.
10. Don’t Stress Post-Exercise Protein Timing
Do not overly worry about consuming protein immediately before or after exercise, as physical activity sensitizes muscle to protein’s anabolic effects for up to 24 to 48 hours, making consistency of training and meals more important.
11. Prioritize Whole Foods Over Supplements
Aim to obtain most of your nutrients from whole food sources rather than relying primarily on supplements, using supplements mainly for practical feasibility in specific situations.
12. Physical Activity Enhances Protein Use
Regularly engage in physical activity, as it makes the body more efficient at utilizing ingested protein, converting more of it to muscle and optimizing muscle reconditioning.
13. Delay Cold Water Immersion Post-Training
Avoid cold water immersion immediately after resistance or endurance training, especially during the first six hours, as it can blunt muscle protein synthesis and compromise acute recovery; consider doing it in the evening or the next day instead.
14. Base Protein on Fat-Free Mass
If you are overweight or obese, base your protein requirements on your fat-free mass rather than total body weight, as fat mass is less metabolically active and does not require as much protein for turnover.
15. Add Protein-Rich Pre-Sleep Snack
If your total daily protein intake is high (e.g., over 75 grams) or you exercise in the evening, consider adding a protein-rich snack before bed to stimulate muscle protein synthesis overnight without blunting the next morning’s anabolic response.
16. Maintain Protein During Hospitalization
For individuals in the hospital, especially those not exercising or eating less due to pain, strive to maintain their normal protein intake to attenuate muscle loss.
17. Don’t Overthink Protein ‘Sweet Spot’
If you are a healthy, sedentary person, don’t overthink the exact ‘sweet spot’ for protein intake, as most individuals naturally consume between 1 and 1.3 grams per kilogram of body weight daily, which is generally sufficient.
18. Gain Muscle with TRE and Training
You can still gain muscle mass while practicing time-restricted eating (TRE) if you maintain sufficient protein intake and engage in resistance training at least three times a week.
19. Strength Precedes Muscle Gains
Understand that initial strength gains from resistance training are primarily neuromuscular and will precede visible increases in muscle mass, so manage expectations and continue training for long-term muscle growth.
20. Tailor Exercise to Individual Goals
Customize exercise programs for older adults based on their individual goals and starting fitness levels, ranging from functional movements like standing from a toilet to more advanced gym routines.
21. Don’t Worry About High Protein
If you are physically active, healthy, not overweight or obese, and do not smoke or consume excess alcohol, you generally do not need to worry about high protein intake causing atherosclerosis.
22. Understand Exercise’s Health Benefits
Recognize that while exercise causes acute stressors like inflammation and oxidative stress, it ultimately sets off a powerful process that leads to improved long-term health and well-being.
23. Sit Upright, Chew Food Thoroughly
Improve protein digestion and absorption by sitting upright while eating and chewing your food thoroughly, as these habits can significantly impact nutrient uptake.
24. Cook Eggs for Faster Amino Acids
Cook eggs to denature the protein, which results in a more rapid release of amino acids into circulation, potentially leading to a quicker anabolic response compared to raw eggs.
25. Mince Meat, Chew Thoroughly
Mincing or finely cutting meat, along with thorough chewing, can significantly improve the rate of protein digestion and absorption.
26. Optimize Protein Intake When Compromised
When total food intake is very low or health is compromised (e.g., bedridden, inflammation), pay extra attention to protein quality, preparation (e.g., minced meat), and even eating posture (sitting upright) to maximize nutrient utilization.
27. Compensate Lower Protein Quality with Quantity
If consuming proteins of lower quality (e.g., some plant-based sources), compensate by increasing the overall quantity to ensure adequate intake of essential amino acids.
28. Plant-Based Protein Requires More Volume
Be aware that achieving sufficient protein intake from plant-based whole foods (e.g., potatoes, beans) requires consuming larger quantities compared to animal sources.
29. Plant-Based Whole Foods Digest Slower
Recognize that plant-based whole foods may have lower protein digestibility due to anti-nutritional factors and fiber, making protein extraction less efficient.
30. Plant Protein Extracts Are Effective
Plant-based protein extracts (e.g., pea protein) can be as effective as dairy protein for stimulating muscle protein synthesis when consumed in sufficient doses (e.g., 30 grams) due to their high digestibility.
31. Vegans Can Gain Muscle with Supplements
Vegans can effectively gain muscle mass by supplementing with plant-based protein powders, especially at high enough doses, to match the muscle gains of those consuming animal-based protein supplements.
32. Combine Diverse Plant Proteins
To achieve a balanced amino acid profile, especially for vegans, combine different plant-based proteins (e.g., wheat and beans, or various plant protein isolates) to compensate for individual amino acid deficiencies (e.g., methionine, lysine, leucine).
33. Choose Protein Isolate for Purity
When selecting a protein supplement, choose a protein isolate if you desire pure protein with minimal other components, or a concentrate if some lactose, fat, or other substances are acceptable.
34. Ensure All Amino Acids for Synthesis
For sustained muscle protein synthesis, ensure a sufficient supply of all essential amino acids, not just leucine, as both signaling and building blocks are crucial for the process.
35. Choose Whey for Higher Leucine
Select whey protein for its higher leucine content, which has strong signaling properties that stimulate the mTOR pathway and initiate the anabolic cascade for muscle protein synthesis.
36. Minimal Protein Supplement Differences
While differences exist between protein supplements like whey, casein, and egg protein in terms of digestion kinetics and leucine content, these differences are very small and likely minimal in real-world dietary contexts.
37. Avoid Excessive Protein Intake
While higher protein intake can be beneficial for muscle gain, consuming protein beyond approximately 1.6 grams per kilogram of body weight is generally not necessary or relevant for further benefits.
38. Consider Omega-3s for Muscle Health
Pay attention to omega-3 fatty acids, as recent research indicates they can help prevent muscle wasting and atrophy associated with aging and disuse, playing a crucial role in maintaining muscle health.
39. Consider Cold Immersion for HIIT Damage
For high-intensity intermittent exercise that causes significant muscle damage and inflammation, cold water immersion may offer benefits by dampening down these effects and improving acute performance, but it is not for optimizing muscle reconditioning.
40. Collagen Not for Muscle Synthesis
Do not expect collagen supplementation to directly increase muscle protein synthesis, as studies have not shown this effect due to its amino acid composition being lower quality for muscle building.
41. Collagen Lower Quality for Muscle
Recognize that collagen is not a high-quality protein for muscle building because approximately 50% of its composition is proline and glycine, resulting in a lower content of essential amino acids needed for muscle protein synthesis.
42. Collagen for Connective Tissue Repair
Consider collagen supplementation for the repair of collagen-rich tissues such as cartilage, bone, tendons, and ligaments, especially after surgery, where there is a high demand for renewing these structures.
43. Use Collagen for Glycine, Proline
Utilize collagen as a good source of glycine and proline, amino acids that are abundant in collagen-rich tissues and may be less prevalent in modern diets.
44. Collagen Not Superior for Connective Tissue
While collagen provides specific amino acids, there is currently no evidence to suggest it is superior to an equivalent amount of amino acids from high-quality dairy or other protein sources for increasing connective tissue protein synthesis.
45. Target Specific Amino Acid Needs
If there is an unbalanced need for specific amino acids, consider sources that are richer in those particular amino acids; for example, collagen is rich in glycine and proline.
46. Hydroxyproline’s Signaling Role
Understand that hydroxyproline, increased in circulation after collagen ingestion, is not a direct precursor for collagen incorporation but might have an unconfirmed stimulatory or signaling effect.
47. Modern Diets Low in Glycine, Proline
Be aware that modern diets, often lacking traditional foods like bone broth and being highly processed, may be low in glycine and proline, which collagen supplementation could help provide.
48. Increase Growth Hormone via Exercise
Naturally increase growth hormone and testosterone levels through exercise, as these hormones, in turn, support connective tissue protein synthesis, with exercise being a more potent stimulus than hormonal changes alone.
49. Download Free Omega-3 Guide
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52. Utilize Episode Show Notes
Refer to the comprehensive episode show notes for more details on the topics and research discussed, as they serve as a standalone resource for deeper scientific understanding.
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6 Key Quotes
Protein is fundamentally the engine of our biology.
Host
Every single day, our bodies renew and replace around 300 grams of protein.
Host
The body can adapt to more or less protein.
Dr. Luc van Loon
Exercise makes the muscle more sensitive to the anabolic properties of protein feeding.
Dr. Luc van Loon
Exercise forgives a lot of sins.
Host (attributing Stu Phillips)
Sedentarism is a disease.
Dr. Luc van Loon
4 Protocols
Optimal Protein Distribution for Muscle Conditioning
Dr. Luc van Loon- Consume 20 to 25 grams of high-quality protein at breakfast.
- Consume 20 to 25 grams of high-quality protein at lunch.
- Consume 20 to 25 grams of high-quality protein at dinner.
- Consider adding another protein-rich meal or snack (e.g., pre-sleep) if total protein intake exceeds 75 grams, especially after an evening exercise session.
Overcoming Anabolic Resistance in Older Adults
Dr. Luc van Loon- Engage in physical activity, such as resistance exercise, before food intake.
Maintaining Muscle Mass During Caloric Restriction
Dr. Luc van Loon- Maintain your absolute daily protein intake at your normal levels.
- Perform at least two sessions of resistance exercise per week.
Starting Resistance Training for Sedentary Elderly
Dr. Luc van Loon- If highly sedentary with mobility issues (e.g., difficulty getting up from a toilet), start with two or three sessions a day of trying to get up from the toilet three times.
- Ensure supervision to prevent falls during initial attempts.