Podcast episode 69 (in German)
Amino acids: the building blocks of life fact-checked
September 7, 2026
No hyped substance, no trend, just the question of whether there is enough building material. This episode explains why protein requirements rise rather than fall with age, what lies behind the number pair 30 and 3, and where the supplement scene exaggerates.
What it is about
Amino acids are the 20 building blocks from which the body builds every protein — muscles and bone matrix as well as enzymes, antibodies, hormones and neurotransmitter precursors. 9 of them are essential and must come from food. The episode first walks through the tasks of individual amino acids beyond muscle and then comes to the core: the double scissor problem of ageing. From around 50, muscle mass is lost, and at the same time the older muscle responds more weakly to the same amount of protein. From this follow the rule of thumb of protein research, the debate about the official intake recommendation, a sober assessment of whey, EAA and BCAA, and the resolution of the mTOR contradiction via the cycle principle.
Key points
- Of the 20 amino acids, 9 are essential; the body can build the remaining 11, but some of them only to a limited extent in old age and under stress.
- About one fifth of the body is protein, and of that, several hundred grams are broken down and rebuilt every day.
- From around 50, without countermeasures, roughly 1 percent of muscle mass is lost per year, and strength declines even faster.
- The rule of thumb of protein research is 30 and 3: about 30 grams of high-quality protein per meal, containing around 3 grams of leucine as the ignition key.
- Expert groups consider the official recommendation of 0.8 grams per kilo to be calculated too low; from midlife, 1.0 to 1.2 grams are cited.
- For preserving muscle and during illness, 1.2 to 1.5 grams per kilo are under discussion, for serious strength training 1.6 to 2.0 grams.
- For 80 kilos, that means around 100 grams of protein daily, spread over 3 to 4 portions — the biggest construction site is almost always breakfast.
Where the data stop
The figures in this episode are guide values from expert recommendations, not individual targets: how much protein someone needs depends on age, training status, body composition and illnesses, and the ranges in the literature are correspondingly wide. The leucine threshold is a well-founded model from muscle physiology, but not a precisely measured limit at which a switch flips.
Also unresolved is the dispute between longevity research and the muscle camp: permanently elevated mTOR is considered a driver of ageing, while mTOR switched on for limited periods is considered a building signal — where exactly the right rhythm lies has been derived on good grounds, not measured. The data only become clearer beyond 60, because there frailty is the more acute risk. And with kidney disease, the amount of protein should be agreed with a doctor.
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Published on September 7, 2026.
The topic in the database
- Nine of the twenty amino acids are essential – building material for muscles, enzymes and hormones, with rising requirements in old age.Amino acids (EAA & BCAA)
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Information only, not medical advice and not a usage or dosage recommendation. Prescription-only and unapproved substances belong in the hands of a physician. Last updated: 2026-10-09.