Creatine got dragged into the fat-loss circus again.

This time, the shiny object is a new Nature Communications paper on brown adipose tissue, thermogenesis, and something called the Futile Creatine Cycle (Bunk et al., 2025).

Cool paper.

Mechanistically spicy.

Mouse-cage chaos with a tiny white lab coat and a flamethrower.

Then the internet did what the internet does: it stuffed the finding into a cheap suit, handed it a microphone, and screamed:

“Creatine is a fat burner!”

Slow down, Broseidon.

A mouse brown-fat mechanism is not a beach-body guarantee.

The Cool Mouse Mechanism

Here’s the simple version.

Brown adipose tissue exists, in part, to make heat.

The classic model says brown fat does this mainly through UCP1, which lets mitochondria waste energy as heat instead of capturing it all as ATP.

Bunk et al. (2025) showed another route.

Creatine enters brown fat cells.

ATP gets used to phosphorylate creatine.

Phosphocreatine breaks back down.

That cycle spins like a drunk ceiling fan in a cheap hotel room at 4 AM.

Net result: energy gets wasted as heat.

No UCP1 required.

That is legitimately cool.

Mechanism: confirmed.

Model: mice.

Limitation: also mice.

And that last part matters unless you are currently living under wood shavings, eating pellets, and hiding from a graduate student named Chad.

Where Hype Drives Into A Ditch

The marketing jump goes like this:

Brown fat burns creatine in mice
↓
Creatine generates heat
↓
Creatine must be a human fat burner
↓
Please buy this overpriced tub of mango-flavored biochemical optimism

That is where the wheels come off.

Mechanisms are not outcomes.

A pathway can be real and still not produce a meaningful real-world effect in humans.

Sugar has mechanisms.

Caffeine has mechanisms.

So does licking a 9-volt battery while staring at PubMed at 1:13 AM., but I am not building a supplement protocol around it.

The question is not:

“Can creatine participate in thermogenic biology?”

Better question:

“When humans take creatine, does fat mass actually drop?”

Now we leave the mouse cage and walk into the human data warehouse, where the lighting is bad, the coffee tastes like regret, and the effect sizes get much less sexy.

The Big Human Meta-Analysis

Pashayee-Khamene et al. (2024) looked at 143 randomized controlled trials.

That is not one influencer’s abs photo.

It is a big honking data net.

Creatine increased body mass by about 0.86 kg.

Fat-free mass went up about 0.82 kg.

Body fat percentage dropped by about 0.28 percentage points.

Absolute fat mass?

Not significant.

Read that again before some supplement rack parasite tries to sell you “thermogenic creatine shred powder” with a neon skull on the label.

Body fat percentage can improve because the denominator changes.

Gain lean mass, glycogen, and water inside muscle, and your percentage can look better even if actual fat mass barely moves.

That is not useless.

Far from it.

Better body composition is good.

Higher training output is good.

More lean mass is very good.

But calling that “creatine burns fat” is like calling a barbell a treadmill because both live in the gym.

Technically adjacent.

Practically deranged.

Adults Under 50

Candow et al. (2023) zoomed in on adults under 50 doing resistance training.

Result?

Body fat percentage dropped about 1.19%.

That was statistically significant.

Absolute fat mass changed by only about -0.18 kg.

Not significant.

Translation: the percentage looked better, but the actual fat in kilograms mostly sat there like a bored bouncer checking IDs at a Tuesday night metal show.

Again, not bad.

Just not magic fairy dust shot out of a unicorn's a$$.

Adults 50 And Older

Forbes et al. (2019) looked at adults 50+ combining creatine with resistance training.

Body fat percentage dropped about 0.55%.

Fat mass was about 0.5 kg lower compared with placebo, but it did not hit statistical significance.

Lean mass and training adaptations are the more believable story here.

That makes physiological sense.

Older adults benefit from resistance training.

Creatine can help support training quality, lean mass, strength, and performance.

Those things can improve body composition.

Still, the lever is not “take creatine and melt fat.”

The lever is “train, recover, eat like an adult, and use creatine as support.”

Less sexy.

More true.

With Training, The Signal Gets Better

Desai et al. (2024) found that creatine plus resistance training increased lean body mass by about 1.14 kg and reduced body fat percentage by about 0.88%.

Fat mass also dropped by about 0.73 kg compared with resistance training alone.

Nice.

I like that signal.

But notice the giant screaming variable standing in the room wearing wrist wraps:

Resistance training.

Training is the driver.

Creatine is rocket fuel, not the steering wheel.

Without the training stimulus, creatine is not a tiny furnace gobbling belly fat while you sleep.

It is mostly helping increase phosphocreatine stores, improve repeated high-intensity output, support training volume, and potentially nudge lean mass over time.

That is plenty.

We do not need to dress it up like a fat-loss wizard wearing a lab coat and selling moon rocks.

What This Means For You

Take creatine because it works.

Not because some headline says it turns you into a thermogenic swamp dragon.

Use creatine monohydrate.

Three to five grams per day works for most humans.

Larger humans, heavy lifters, and people trying to saturate faster may use more, but the boring daily dose still wins the practicality cage match.

Pair it with progressive resistance training.

Keep protein high.

Put calories where they need to be for your goal.

Chase fat loss with energy balance, steps, lifting, sleep, and enough cardio to keep your mitochondria from filing a workplace complaint.

Creatine supports the machine.

It does not replace the work.

The Honest Take

Creatine has a ton of proven benefits.

Strength.

Power.

Lean mass.

Repeated sprint ability.

Possible cognitive and aging-related applications.

Recovery support in some contexts.

Fat loss as a standalone claim?

Nope.

Not based on the current human data.

The new mouse paper is fascinating.

The human meta-analyses are useful.

Your takeaway is simple:

Do not let cool science become bad advice.

If you want the full creatine breakdown — dosing, loading, kidneys, hair loss, caffeine, forms, brain health, endurance, aging, and all the supplement aisle nonsense that refuses to die — I built the Complete Creatine Manual for exactly that.

Grab it here:

​https://creatine.miketnelson.com​

It is my product, not an affiliate link.

...and for the love of phosphocreatine, stop letting the internet turn every mouse mechanism into a human miracle.

Much love, heavy lifts, and fewer supplement fairy tales,
Dr. Mike

PS — Creatine is still one of the best-supported supplements on planet Earth. Just don’t make it wear the wrong costume. Strength/power/lean mass? Yes. Standalone fat burner? That clown car is out of gas.

References

Bunk, J., Hussain, M. F., Delgado-Martin, M., Samborska, B., Ersin, M., Shaw, A., Rahbani, J. F., & Kazak, L. (2025). The futile creatine cycle powers UCP1-independent thermogenesis in classical BAT. Nature Communications, 16, 3221.

Candow, D. G., Prokopidis, K., Forbes, S. C., Rusterholz, F., Campbell, B. I., & Ostojic, S. M. (2023). Resistance exercise and creatine supplementation on fat mass in adults <50 years of age: A systematic review and meta-analysis. Nutrients, 15(20), 4343.

Desai, I., Wewege, M. A., Jones, M. D., Clifford, B. K., Pandit, A., Kaakoush, N. O., Simar, D., & Hagstrom, A. D. (2024). The effect of creatine supplementation on resistance training-based changes to body composition: A systematic review and meta-analysis. Journal of Strength and Conditioning Research, 38(10), 1813–1821.

Forbes, S. C., Candow, D. G., Krentz, J. R., Roberts, M. D., & Young, K. C. (2019). Changes in fat mass following creatine supplementation and resistance training in adults ≥50 years of age: A meta-analysis. Journal of Functional Morphology and Kinesiology, 4(3), 62.

Pashayee-Khamene, F., Heidari, Z., Asbaghi, O., Ashtary-Larky, D., Goudarzi, K., Forbes, S. C., Candow, D. G., Bagheri, R., Ghanavati, M., & Dutheil, F. (2024). Creatine supplementation protocols with or without training interventions on body composition: A GRADE-assessed systematic review and dose-response meta-analysis. Journal of the International Society of Sports Nutrition, 21(1), 2380058.

_____________________

Mike T Nelson CISSN, CSCS, MSME, PhD
Associate Professor, Carrick Institute
Owner, Extreme Human Performance, LLC
Editorial Board Member, STRONG Fitness Mag

Mike T Nelson is a PhD and not a physician or registered dietitian. The contents of this email should not be taken as medical advice. It is not intended to diagnose, treat, cure, or prevent any health problem - nor is it intended to replace the advice of a physician. Always consult your physician or qualified health professional on any matters regarding your health.

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