How much muscle mass do people typically lose per year, and when does it start declining?

Most people begin to lose muscle mass in their 30s or 40s, with some research suggesting it's closer to 56. On a population level, it's about a 1% loss of muscle mass and 1-3% drop in strength or power per year. Building muscle 'reserves' earlier helps decline from a higher plateau.

What is the optimal daily protein intake for adults, and how does it differ from the recommended daily allowance (RDA)?

The RDA for protein is 0.8 grams per kilogram of body weight, considered a minimal intake to prevent deficiency. An optimal intake for maintaining muscle mass and supporting health is closer to 1.2 g/kg/day, with active individuals potentially benefiting from up to 1.6 g/kg/day. Older adults often reduce protein intake when they need it most.

Do animal studies on caloric and protein restriction apply to humans, considering 'disuse and disease' factors?

Extrapolating caloric and protein restriction data from lab rodents to humans can be murky due to humans' susceptibility to 'disuse and disease.' Lab animals are in controlled, sterile environments, unlike humans who face catabolic crises like injury, illness, or extended periods of inactivity (e.g., bed rest, winter sedentarity), which dramatically accelerate muscle loss and are not replicated in rodent studies.

How important is protein timing throughout the day or around exercise for muscle growth?

For most people, the total amount of protein consumed in a day is more important than precise timing. While elite athletes might benefit from even spacing (e.g., breakfast, lunch, dinner, snack), for mere mortals, it's not a 'big deal.' Timing with respect to exercise is also less significant than once thought.

Can plant-based protein sources adequately support muscle protein synthesis?

Historically, animal proteins were considered superior due to higher essential amino acid content. However, with modern processing methods, isolation of plant proteins, and preparation techniques like cooking, sprouting, and fermentation, many plant-based proteins are now high-quality and can effectively stimulate muscle protein synthesis.

Are testosterone and growth hormone a significant factor in muscle growth in healthy adults?

No, within normal physiological variation, transient increases in testosterone and growth hormone due to exercise do not have a major anabolic effect on muscle protein synthesis. While supraphysiological levels (from steroids or exogenous hormones) can increase muscle mass, normal fluctuations are less impactful. Steroid hormones are crucial for stature and collagen synthesis, but not necessarily muscle mass increase in adults.

What role does thermal stress, like sauna use, play in muscle health?

Sauna use (thermal stress) can induce heat shock proteins, which act as chaperones to prevent protein misfolding and can alleviate muscle atrophy. While not directly increasing muscle mass via growth hormone, it mimics some aspects of exercise, affects the cardiovascular system, and has psychological benefits, making it an interesting area for further study, especially for those unable to exercise.

Can Omega-3 fatty acid supplementation help with muscle loss or recovery?

Yes, high-dose omega-3 fatty acid supplementation has been shown to result in a milder disuse atrophy response and quicker recovery from periods of inactivity. This indicates an anti-catabolic effect, making it a promising nutritional intervention, especially for older or injured populations, and it also aids in resolving chronic inflammation.

Is Creatine Monohydrate beneficial and safe for muscle and cognitive health, even for non-active individuals?

Yes, Creatine Monohydrate is considered beneficial for muscle growth (mild but potent effects) and increasingly for brain and cognitive performance. It has an excellent safety profile with 40 years of data showing no widespread adverse effects. It's recommended at 4-5 grams per day for both younger and older individuals, even those not actively lifting weights, and is endorsed by neuromuscular physicians for compromised muscle function.

Key Moments

Stuart Phillips, PhD, on Building Muscle with Resistance Exercise and Reassessing Protein Intake

FoundMyFitness

Science & Technology4 min read111 min video

Jun 29, 2022|795,190 views|8,744|542

muscle aging dietary protein nutrition resistance exercise weightlifting Dr. Stuart Phillips muscle protein synthesis sarcopenia leucine branched-chain amino acids mTOR

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Key Moments

TL;DR

Building muscle requires resistance exercise and adequate protein, crucial for aging well and maintaining healthspan.

Key Insights

Muscle mass is vital for health and mortality, and its decline (sarcopenia) begins around age 30-40, accelerating with age.

Resistance exercise is the primary driver for muscle mass and strength gains, with protein intake providing a smaller, supportive effect.

The Recommended Dietary Allowance (RDA) for protein (0.8g/kg body weight) may be too low; 1.2-1.6g/kg is suggested for optimal health and muscle maintenance, especially for active individuals and older adults.

While animal proteins are generally higher in essential amino acids, well-processed or combined plant-based proteins can also effectively support muscle protein synthesis.

Hormones like testosterone and growth hormone have complex roles; their natural fluctuations from exercise are less impactful than exogenous supplementation, which carries risks.

Sauna use may benefit muscle health through heat shock proteins and have positive effects on mood and potentially reduce atrophy, separate from direct growth hormone effects.

Creatine monohydrate is a safe and effective supplement for muscle and cognitive health, benefiting both active individuals and older adults, even those who are less active.

Omega-3 fatty acids show promise in reducing disuse atrophy and aiding recovery, acting as an anti-catabolic nutritional intervention.

THE CRITICAL ROLE OF MUSCLE MASS

Muscle mass is a crucial, often overlooked, component of overall health, directly impacting mobility, strength, and even mortality. As we age, muscle mass naturally declines (sarcopenia), often starting in our 30s or 40s, leading to reduced strength and increased frailty. This decline can be significantly slower than the loss of strength, suggesting that muscle quality and neural activation play vital roles. Maintaining muscle mass is essential for performing daily activities, preventing dependency, and enhancing healthspan by delaying age-related diseases.

RESISTANCE EXERCISE AS THE PRIMARY DRIVER

The most effective strategy for building and maintaining muscle mass and strength is resistance exercise. While protein intake is important, the benefits derived from the exercise stimulus itself are far greater. For instance, achieving 1.6g of protein per kilogram of body weight daily was found to provide only a small additional benefit compared to the gains achieved from consistent resistance training. Therefore, prioritizing regular workouts that challenge muscles is paramount for muscle hypertrophy and functional improvements.

REASSESSING PROTEIN INTAKE NEEDS

The current Recommended Dietary Allowance (RDA) of 0.8g of protein per kilogram of body weight is considered a minimum to prevent deficiency, not an optimal target for muscle health. Research suggests that a range of 1.2g/kg is a more appropriate baseline, with 1.6g/kg or higher potentially beneficial for physically active individuals, older adults, or those in a caloric deficit. Adequate protein intake is crucial, especially as we age, to counteract anabolic resistance and support muscle maintenance and repair processes.

OPTIMIZING PROTEIN QUALITY AND TIMING

While animal proteins are generally rich in essential amino acids like leucine, plant-based proteins can also effectively support muscle protein synthesis, especially when processed or consumed in varied combinations. The key is ensuring sufficient intake of branched-chain amino acids, particularly leucine, which acts as a potent trigger for muscle protein synthesis. While protein timing (e.g., even spacing throughout the day) can offer marginal benefits for elite athletes, total daily intake remains the most significant factor for most individuals.

HORMONAL INFLUENCES AND THEIR LIMITATIONS

Hormones like testosterone and growth hormone play complex roles in muscle physiology. Resistance training does cause transient increases in these hormones, and testosterone influences androgen receptor content, but their direct impact on muscle protein synthesis within normal physiological ranges may be less significant than commonly believed. Exogenous supplementation, which achieves supra-physiological levels, can drive muscle growth but carries risks, including potential pro-cancer effects. For most individuals, focusing on exercise and nutrition is more beneficial than pursuing hormone optimization.

THE POTENTIAL OF SAUNA AND THERMAL STRESS

Sauna use, beyond its impact on growth hormone, may offer benefits through heat shock proteins. These proteins play a protective role, helping to prevent protein misfolding and potentially mitigating muscle atrophy, especially in situations of disuse or stress. The thermal stress from saunas might mimic some aspects of exercise stress, contributing to muscle health and potentially offering antidepressant effects. This area warrants further research, particularly for elderly individuals or those with muscle loss conditions.

SUPPLEMENTS: CREATINE AND OMEGA-3S

Creatine monohydrate stands out as a well-researched and safe supplement, demonstrating benefits for muscle strength, mass, and cognitive function in various populations, including older adults. Omega-3 fatty acids also show promise, particularly in reducing disuse atrophy and aiding muscle recovery, acting as an anti-catabolic nutritional intervention. These supplements can complement exercise and diet, especially for individuals who may struggle to meet protein or activity goals through food alone.

MANAGING INFLAMMATION AND ANABOLIC RESISTANCE

Chronic low-grade inflammation ('inflammaging') can contribute to anabolic resistance, making it harder for muscles to respond to stimuli like exercise and protein. Dampening this inflammation through lifestyle choices, including omega-3 intake and potentially other anti-inflammatory strategies, might be crucial for optimizing muscle health, particularly in older adults. While a degree of inflammation is necessary for repair, excessive chronic inflammation can impair the body's ability to build and maintain muscle tissue effectively.

Mentioned in This Episode

●Supplements

●Concepts

●People Referenced

Muscle Building & Protein Intake: Key Takeaways

Practical takeaways from this episode

Do This

Prioritize total daily protein intake (aim for 1.2-1.6g/kg body weight).

Engage in resistance exercise at least 2-3 times per week for 30-45 minutes.

Lift until fatigue, focusing on compound movements like squats, bench press, and shoulder press.

Distribute protein intake evenly throughout the day, especially for older adults.

Include high-quality protein sources, considering processed plant proteins are increasingly effective.

Consider omega-3 and creatine supplementation, especially for older adults or during periods of increased workload.

Maintain physical activity to preserve vascular insulin sensitivity.

Address underlying chronic low-grade inflammation to improve anabolic responses.

Avoid This

Solely rely on the RDA (0.8g/kg) for protein, as it's a minimal intake, not optimal.

Overemphasize protein timing around workouts for general population (more relevant for elite athletes).

Worry excessively about protein quality from whole, cooked plant foods due to preparation methods.

Expect significant muscle growth from transient increases in testosterone or growth hormone from exercise.

Take unproven 'testosterone-boosting' supplements that lack robust scientific evidence.

Overlook sedentary periods (disuse) as they significantly accelerate muscle loss with age and illness.

Common Questions

Muscle mass is a vital component of lean mass on the scale, essential for strength, mobility, and performing daily activities. Its preservation as we age is critical for health and it inversely correlates with mortality, predicting a downward decline in frailty and increasing the risk of institutionalized care.

Topics

Resistance Exercise Health Span MTOR

Mentioned in this video

People

Ron Maughan

A mentor of Dr. Phillips, from whom he adopted his 'three rules of supplements': 1) if it sounds too good to be true, it probably is; 2) if it's too good to be true, it's probably banned or requires a prescription; 3) there are very few exceptions.

Yari Latchen

A friend and potential collaborator of the host, based in Eastern Finland, with samples for studying the effects of heat shock response.

Doug Padden Jones

A good friend and colleague of Dr. Phillips, whose work highlighted the concept of catabolic crises and their impact on muscle mass.

Eric Rossen

A good friend of Dr. Phillips, who gives talks on the ineffectiveness of many testosterone-boosting supplements, stating they are often 'what's old is new' and have no real scientific backing.

Jen Heist

A colleague of Dr. Phillips who wrote a book on the mental health benefits of exercise, including improvements in mood, depressive symptoms, and anxiety.

Dr. Longo

A scientist mentioned by the host who has studied populations of dwarves with a lack of growth hormone receptors, observing that they don't get cancer, raising questions about the benefits of chronically elevated growth hormone in 'anti-aging' contexts.

Supplements

Branched-chain amino acids (BCAAs)

A group of three essential amino acids, with leucine being the most potent. While popular as a sports supplement, their effectiveness, when already on a high-protein diet, is largely considered negligible, making them 'closer to the useless end' except for the leucine component.

Concepts

mTOR (mechanistic Target of Rapamycin)

A highly conserved protein that acts as an integrative nexus for anabolic stimuli like resistance exercise and nutrients (particularly leucine), leading to protein synthesis and regenerative processes. There are proposed two complexes: mTORC1 (nutrient-sensitive, Rapamycin-sensitive) and mTORC2 (exercise-sensitive, Rapamycin-insensitive).

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