EAAs and anti-ageing

This article was reviewed by Dr Mark Atkinson, M.B.B.S., FRSPH, for medical and scientific accuracy before publication.

In brief | Muscle loss | Anabolic resistance | EAAs for muscle maintenance and anabolic resistance | mTOR and anti-ageing | EAAs, fasting and muscle maintenance | Conclusion

This article does not explain EAAs from the ground up. Would you first like to understand what EAAs are exactly, how they work and when they are practically useful? Then also read our article on when an EAA supplement is needed. Here, we focus on something more specific: why EAAs may be interesting from an anti-ageing perspective.

In brief

• With age, muscle mass, muscle strength and muscle function gradually decline.
• Older muscles often respond less strongly to the same amount of protein or amino acids. This is called anabolic resistance.
• From an anti-ageing perspective, EAAs are particularly interesting because of their role in muscle maintenance.
• Leucine in particular helps activate muscle-building signals, but all essential amino acids remain necessary as building material.
• EAAs are not a replacement for whole foods, but a strategic addition within a broader approach that includes sufficient protein intake and strength training.

Muscle loss

From around the age of 30, muscle mass gradually declines. Later in life, this process often accelerates, especially when you do little strength training or consume insufficient protein. (1)

This makes muscle maintenance important. Muscle mass largely determines how strong and mobile you remain. In addition, muscle mass plays an important role in metabolism, because muscles help absorb and store glucose from the bloodstream. (1)

Later in life, muscle loss often goes beyond simply having less muscle mass. Muscle strength and muscle function may also decline. This broader condition is called sarcopenia. (2)

Anabolic resistance

Alongside muscle loss, something else happens: with age, muscles often respond less strongly to protein and amino acids. The same amount of protein or amino acids stimulates muscle building less effectively than it did earlier in life. This is known as anabolic resistance.

A meal that was once sufficient to stimulate muscle recovery and muscle building at a younger age may therefore become less effective later in life. (3)

EAAs for muscle maintenance and anabolic resistance

EAAs may be interesting for muscle maintenance because they provide all essential amino acids the body needs for muscle recovery and muscle building. (4)(5)

Particularly in anabolic resistance, a targeted EAA stimulus may be relevant because older muscles often require a stronger signal to properly stimulate muscle protein synthesis. (3)(5)

Leucine in particular plays an important role here. Leucine is one of the essential amino acids and acts as an important trigger for muscle-building signals. One of these signals runs through mTOR. (5)(6)

mTOR can be seen as a kind of growth switch in the body. When this switch is temporarily activated, it helps support recovery, repair and muscle growth. This is particularly relevant after strength training or after a protein-rich meal. (5)

At the same time, leucine alone is not enough. To truly repair and build muscle tissue, all essential amino acids are required as building material. That is why EAAs are especially interesting as a complete amino acid stimulus, not merely as an isolated trigger.

EAAs are practical because they are already available in free form. The body therefore does not first need to break them down from a complete protein source.

How do you view mTOR from an anti-ageing perspective?

In anti-ageing discussions, mTOR is sometimes viewed critically because chronically elevated mTOR activity is primarily associated with growth and building processes. For healthy ageing, you do not want the body to remain continuously in that growth state.

But that does not mean mTOR is always something to avoid. For muscle maintenance and recovery, you do want strong, temporary pulses of muscle-building activity at the right moments, such as after strength training or after a protein-rich meal. (5)(6)

Practically speaking: you do not want to maximise mTOR continuously, but you do want to activate it functionally when it is useful.

EAAs, fasting and muscle maintenance: what is the trade-off?

Many anti-ageing routines include intermittent fasting or calorie restriction. That may have benefits, but it also carries a risk: it becomes easier to consume too little protein, which may contribute to muscle loss.

Calorie restriction means consuming fewer calories than the body uses. Intermittent fasting means limiting food intake to a specific eating window, for example by skipping breakfast or eating only within an eight-to-ten-hour window each day. (3)

For muscle maintenance, total protein intake is especially important. If fasting or calorie restriction structurally leads to insufficient protein intake, this may negatively affect muscle mass over time.

That is why the goal is not “perfect fasting”, but the right balance. From an anti-ageing perspective, you want to benefit from the possible advantages of fasting without sacrificing muscle maintenance. In that trade-off, muscle maintenance is often more important than following a strict fasting protocol.

Conclusion

EAAs are often primarily viewed as a sports supplement. But they are also particularly interesting from an anti-ageing perspective: they may help preserve muscle mass more effectively as you age.

This matters because muscle loss increases with age and muscles often respond less strongly to the same amount of protein or amino acids. For that reason, actively supporting muscle maintenance becomes increasingly important.

From an anti-ageing perspective, the goal is not to keep mTOR permanently maximised, but to create strong, temporary muscle-building signals at the right moments. EAAs may play a useful role in that context.

EAAs are not a miracle solution and not a replacement for good nutrition, sufficient protein intake and strength training. View them as a strategic addition within a smart anti-ageing approach.

References

1) St-Onge MP, Gallagher D. Body composition changes with aging: the cause or the result of alterations in metabolic rate and macronutrient oxidation? Nutrition. 2010;26(2):152-5.

2) Cruz-Jentoft AJ, Bahat G, Bauer J, et al. Sarcopenia: revised European consensus on definition and diagnosis. Age Ageing. 2019;48(1):16-31.

3) Breen L, Phillips SM. Skeletal muscle protein metabolism in the elderly: interventions to counteract the “anabolic resistance” of ageing. Nutr Metab. 2011;8:68.

4) Lopez MJ, Mohiuddin SS. Biochemistry, Essential Amino Acids. StatPearls, 2023.

5) Ferrando AA, et al. Essential Amino Acids and Protein Synthesis: Insights into Maximising the Muscle and Whole-Body Response to Feeding. Nutrients. 2020;12(12):3717.

6) Ferrando AA, Wolfe RR, Hirsch KR, et al. International Society of Sports Nutrition Position Stand: Effects of essential amino acid supplementation on exercise and performance. J Int Soc Sports Nutr. 2023;20(1):2263409.