Creatine Monohydrate Explained: ATP, Water Retention + Bloating

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Creatine Monohydrate: What It Actually Does to Your Energy System

Most people take creatine because everyone says to take it, and they never learn what it is doing inside the muscle, so when the scale jumps three pounds in two weeks they panic and quit.

Start with the energy system itself, because creatine only makes sense once you see where it sits in the chain.

Every muscle contraction you produce runs on something called ATP, which is the molecule your cells break apart to release usable energy. Your muscle holds only a few seconds of it at any moment, and once you start a heavy set you burn through that stock almost immediately, so the body has to make more or the set ends.

It has three ways to do that, and which one it uses depends entirely on how hard and how long you are working. Low intensity work runs on fat and oxygen, moderate work runs on glucose through glycolysis, and the fastest possible resupply comes from a phosphate handoff that happens in under a second, and it is this last pathway, the fastest one, where creatine lives and does its work (De Feo et al., 2003).

This is going to help serve the process of producing ATP, especially if you're operating in a place where you're exercising with a high amount of intensity.

Think of creatine as a way to add a small capacitor of stored ATP that lives outside of your cells so that when you're performing anaerobic activity, you're lifting heavy weights and you're going close to failure, your cells have the ability to reach out and grab this immediate source of ATP that's being stored through.

A capacitor is close to the right picture, since the thing does not generate power on its own, it just holds a small charge and releases it fast, and then it recharges between uses. That is why creatine does nothing for your marathon time and quite a lot for your fifth, sixth, and seventh rep on a heavy set, because those are the reps where the ATP has run out and the set is about to break down.

Two extra reps per set, across every set, across months of training, is more total work, and that additional work is what feeds the growth signal your muscle responds to over time. That's the value of creatine.

Now, one thing to note is that when you do take this, some people can get discomfort and bloating in the stomach. I cannot point you to a study that isolates the cause of that, and I have seen it resolve almost every time by cutting the dose rather than switching the brand. Start with a smaller dose and work your way up, somewhere around two grams a day for the first week or two, then move toward five.

Take it with food and with a full glass of water rather than dry scooping it on an empty stomach.

The weight gain question deserves the same honesty. Creatine is stored in the muscle alongside water, and the research hasn't given me a clean number I can hand you on how much of that early scale movement is intracellular fluid versus anything else, so what follows is what I see with clients rather than what the literature settles.

Two to four pounds in the first few weeks is typical, and it shows up too fast to be tissue. Keep in mind that weight on the scale is water pulled into the muscle to store the fuel it is holding onto, not fat.

If you are someone who weighs in daily and lets that number set your mood, take a baseline before you start, then leave the scale alone for three weeks and come back to it once the muscle has filled and stabilized.

Most of what I know about this came out of conversations in the free community, so if you want the rest of it and somewhere to ask, the men's group is here: https://www.skool.com/jh-iron-forge-brotherhood/about

Research: De Feo P, Di Loreto C, Lucidi P et al. The body's metabolic response during physical exercise, published in the Journal of Endocrinology Investigation back in 2003.

References:

De Feo P, Di Loreto C, Lucidi P et al.. Metabolic response to exercise. J Endocrinol Invest. 2003. https://pubmed.ncbi.nlm.nih.gov/14964437/