Creatine — research review 3

…and this phosphocreatine acts like a rapid energy buffer. So, when your cells, especially in muscle or brain, demand a quick burst of energy, phosphocreatine can quickly regenerate ATP.

Right, and we know that this buffering system is pretty critical. Like, that paper in J Muscle Res Cell Motil from 2017, it explains how creatine kinase, the enzyme involved, extends the duration of activity possible by buffering ATP.

Exactly. And the longevity angle comes in because, as we age, processes like sarcopenia and cognitive decline become more prevalent. Creatine supplementation seems to offer some protection there.

Yeah, the evidence for older adults is quite compelling. Amino Acids in 2011 noted that creatine supplementation in older individuals increases lean mass, enhances fatigue resistance, and boosts muscle strength, potentially reducing the burden of sarcopenia.

And for the brain, Nutrition Reviews in 2023 highlighted that creatine enhanced memory performance, particularly in older adults aged 66-76.

So, it sounds promising. But what are the open questions, what still genuinely unknown? For example, how does creatine interact with broader metabolic pathways, like AMPK? We know from Frontiers in Physiology 2018 that reduced phosphocreatine activates AMPK, but what’s the full picture of that interplay?

That’s a great point. We understand the immediate energy buffering, but the long-term systemic effects and how it integrates with overall energy homeostasis, beyond just ATP, is still being explored. Also, while we know vegetarians have lower creatine stores (Int J Sport Nutr Exerc Metab 2004) because meat and fish are primary sources (J Appl Physiol 2017), the optimal dosage for different age groups and conditions, and whether sustained high levels have any unforeseen long-term consequences in humans, is still an area of active research. We have good evidence for benefit, but the nuanced 'how' and 'how much' across a lifespan are still being refined.