Appetite is one of the side questions about creatine that gets asked in both directions — "creatine made me starving" and "creatine killed my appetite" — and the literature almost never measures it. That is partly because creatine contains no calories that matter and has no known action on hunger hormones, so most trials never thought to ask. When they did, they found nothing.
This page covers hunger and food intake. Body weight is on creatine and the scale, calories on does creatine have calories, and fat loss on does creatine help with weight loss.
The one trial that measured appetite directly
The clearest test comes from an unexpected place: a trial of creatine for the cancer anorexia/weight-loss syndrome, run by the Alliance cooperative oncology group and published in Annals of Oncology in 2017. The idea was that creatine might build muscle and strength and slow wasting.
- Who: 263 evaluable patients with incurable cancer and weight loss — 134 on creatine, 129 on placebo.
- What: creatine at 20 g a day for 5 days, then 2 g a day, against an identical placebo.
- Appetite: measured with validated questionnaires over the first month.
- Result: no statistically significant difference in appetite, quality of life, daily activities, grip strength or body composition. Three people gained 10% of body weight in a month — two on creatine, one on placebo. Median survival was 230 versus 239 days.
The figures are as the trial reports them; none of them is a recommendation.
This is a sick population, not lifters, and appetite in cancer is driven by things creatine does not touch. But it is the only placebo-controlled trial with appetite as a measured outcome, and it found creatine did not move it.
Diet records in other trials
Several creatine trials asked participants to record what they ate — usually to make sure diet did not differ between groups. Those records double as a check on appetite:
| Trial | Who | Creatine | Food intake result |
|---|---|---|---|
| Kutz and Gunter 2003 | 17 active men, strength training | 30 g a day for 2 weeks, then 15 g, 4 weeks | No significant change in daily calories; body weight +1.7 kg, body water +3.4 L, body fat % unchanged |
| Marini et al. 2020 | 30 hemodialysis patients | 20 g a day for 1 week, then 5 g, 4 weeks | Food intake did not change; lean mass rose more than on placebo |
| Lobo et al. 2015 | 109 postmenopausal women | 1 g a day, 1 year | Diet assessed by three 24-hour recalls; no changes in body weight, fat or lean mass reported |
These trials were not powered to find a change in appetite, and food diaries are imprecise. What they show is that nobody in them started eating noticeably more or less. The Kutz trial also shows where the early weight comes from: the 1.7 kg gain came with 3.4 L more body water and no extra calories.
Where "lost appetite" comes from
The best-documented route to a reduced appetite on creatine is the stomach. In a 2008 trial in 59 professional soccer players, creatine for 28 days was given either as two 5 g servings or one 10 g serving a day, against placebo:
- Diarrhoea: 55.6% on a single 10 g serving, 28.6% on two 5 g servings, 35.0% on placebo.
- Stomach upset and belching were common in every group, placebo included.
The figures are as the trial reports them; none of them is a recommendation. Nausea, stomach discomfort and diarrhoea dull appetite; the gut side effects and the serving-size pattern are on creatine diarrhea and creatine bloating.
The FDA's adverse-event database tells the same story. On 2026-10-22, openFDA held 210 reports naming a product with "creatine" in its brand name. Six list decreased appetite; none lists increased appetite. Of the six, most pair it with nausea, abdominal pain, diarrhoea, dehydration or liver-related reactions, and several name multi-ingredient products alongside the creatine — a pre-workout, a powdered caffeine product, a fat-loss formula. A report records what happened after use, not what caused it.
The rat study
The only experiment to find a direct effect on eating is a 2025 study in Nutrients of 24 rats: six male and six female rats on creatine, the same numbers as controls. Male rats on creatine ate less than male controls, without a difference in weight gain; female rats showed no difference. It is one small animal study, the mechanism is unknown, and it has not been repeated in people.
Stimulants and protein: the confounders
Two things often bought alongside creatine affect appetite on their own:
- Caffeine. Creatine-containing pre-workouts carry a median of 350 mg of caffeine per serving in this site's census of 130 labels (pre-workout caffeine figures). A change in appetite after switching products may follow the caffeine, not the creatine.
- Protein. Creatine is often started together with a protein shake, and protein affects fullness in its own right — gelatin, a collagen protein, cut hunger more than casein in short lab studies (collagen and weight loss). Starting both at once makes any change in hunger impossible to pin on either.
What the registry holds
A ClinicalTrials.gov search on 2026-10-22 for creatine as an intervention with the term appetite returned five records: the cancer weight-loss trial above (NCT00081250), a Rett syndrome metabolism study, a recruiting trial of higher protein intake in women on GLP-1 drugs, and two unrelated cancer-drug trials. None is designed to test whether creatine changes appetite in healthy people.
What is not established
- Any effect of creatine on hunger in healthy, training adults. Never measured with an appetite scale.
- Any effect on appetite hormones. A 2020 pilot trial in older adults measured leptin and found no difference between groups after 12 weeks; a PubMed search on 2026-10-22 found no human creatine-supplementation study that measured ghrelin.
- Whether the male-rat finding applies to people. Untested.
Unexplained loss of appetite or unintended weight change is a reason to see a clinician, whatever supplement is involved.
Sources
All opened 2026-10-22.
- Jatoi A et al. "A double-blind, placebo-controlled randomized trial of creatine for the cancer anorexia/weight loss syndrome (N02C4): an Alliance trial." Ann Oncol 2017;28(8):1957–1963. PMID 28475678
- Kutz MR, Gunter MJ. "Creatine monohydrate supplementation on body weight and percent body fat." J Strength Cond Res 2003;17(4):817–21. PMID 14636103
- Marini ACB et al. "Short-Term Creatine Supplementation May Alleviate the Malnutrition-Inflammation Score and Lean Body Mass Loss in Hemodialysis Patients." JPEN 2020;44(5):815–822. PMID 31531996
- Lobo DM et al. "Effects of long-term low-dose dietary creatine supplementation in older women." Exp Gerontol 2015;70:97–104. PMID 26192975
- Ostojic SM, Ahmetovic Z. "Gastrointestinal distress after creatine supplementation in athletes: are side effects dose dependent?" Res Sports Med 2008;16(1):15–22. PMID 18373286
- Wideman C et al. "Effect of Creatine Monohydrate on Spatial Working Memory, Body Weight, and Food Intake in Male and Female Rats." Nutrients 2025;17(13):2218. PMID 40647322
- Oliveira CLP et al. "Creatine supplementation does not promote additional effects on inflammation and insulin resistance in older adults: A pilot randomized, double-blind, placebo-controlled trial." Clin Nutr ESPEN 2020. PMID 32690185
- openFDA, food/event endpoint (CAERS):
products.name_brand:creatine, reaction counts, queried 2026-10-22. api.fda.gov - ClinicalTrials.gov API v2: intervention "creatine", term "appetite", 5 records, queried 2026-10-22.