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EAAs – Essential Amino Acids: More Complete Than BCAAs
What are EAAs?
EAAs (Essential Amino Acids) are the nine amino acids that the human body cannot synthesize itself and therefore must obtain through diet: Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan and Valine. BCAAs (Leucine, Isoleucine, Valine) are a subgroup of EAAs.
All 9 EAAs are simultaneously needed for muscle protein synthesis. If even one is missing, protein synthesis is limited to the level of the limiting amino acid – like a barrel with a short stave (Liebig's Law of the Minimum). Therefore, EAAs as a supplement offer a more complete approach compared to BCAAs alone.
EAAs vs. BCAAs: The Decisive Difference
| Property | BCAAs (3 AA) | EAAs (9 AA) |
|---|---|---|
| Completeness | Incomplete | Complete |
| MPS Stimulation | Limited | ⭐⭐⭐⭐⭐ Maximal |
| Anti-Catabolism | ⭐⭐⭐⭐ Good | ⭐⭐⭐⭐⭐ Better |
| Intra-workout | Suitable | ⭐⭐⭐⭐⭐ More suitable |
| Price | Inexpensive | More expensive |
When EAAs are beneficial
EAAs are particularly valuable in three situations: fasted training (complete amino acid supply without calories from carbohydrates/fats), intra-workout during long sessions (>75 minutes) for continuous muscle protein synthesis, and as a meal replacement between protein meals when only a fast-absorbing amino acid source is needed.
EAAs and Muscle Protein Synthesis
Muscle Protein Synthesis (MPS) is an anabolic process that requires all amino acids simultaneously. Studies show that EAAs can stimulate MPS by 100–150% above baseline – significantly more than BCAAs alone (+30–50%). The difference becomes particularly relevant when the remaining EAAs from the body's free amino acid pool are limited (e.g., fasted or on a diet).
Dosage
| Application | Dose | Timing |
|---|---|---|
| Fasted Training | 10–15 g | Before workout |
| Intra-workout | 10–15 g | During long sessions |
| Between meals | 10 g | 3–4 hours after last protein meal |
Important: Ensure a complete EAA profile with sufficient Leucine (at least 2–3 g) per serving.
Frequently Asked Questions (FAQ)
Can EAAs replace a protein meal?
For muscle protein synthesis, short-term yes – but EAA supplements do not provide calories, fats, or other nutrients. Ideal as a short-term bridging solution between meals, but not a permanent substitute for whole protein sources.
Are EAAs better than Whey?
No, not generally. Whey contains all EAAs plus fats, carbohydrates, and other nutrients. EAAs have advantages in fasted training (no unwanted calories) and as an intra-workout supplement (fast absorption, no stomach upset).
Related Terms
BCAA · Leucine · Whey Protein · Creatine
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