Cantaloupe: most of the evidence is about safety

Cantaloupe is one of the few fruits where the firmest thing we hold is a safety finding rather than a health one. Two outbreak investigations, in Australia in 2006 and across the UK and Portugal in 2023, tied illness to eating it with very high odds ratios, and the one large cohort analysis that lists it on its own line points toward risk rather than away from it. Start with how variable it is. Eight USDA reference samples of raw cantaloupe differ more than fivefold in vitamin C, from 3.9 to 18.4 mg per 100 g, and thirteenfold in copper, while water content moves by only 3 percent. The number on any chart is an average of melons that were not much alike. On health, the largest study we hold points the wrong way: across three US cohorts and 3.5 million person-years, cantaloupe was the one whole fruit linked to more type 2 diabetes, a hazard ratio of 1.10 per three servings a week, against 0.74 for blueberries. That is observational, and nobody has fed anyone melon to test it. The only randomised trials on this page do not use the fruit at all. They use a 10 mg daily capsule of a superoxide dismutase concentrate made from melon, and what that capsule did to perceived stress in 61 adults over 12 weeks tells you nothing about a bowl of fruit. The second capsule trial is thinner still. It reports less oxidative stress and a lower C-reactive protein in trained adults without publishing a single number for the people in it. The 38 percent and 28 percent you may see quoted from it are results in rats. The firm finding is on the other side. In a 2023 outbreak across the UK and Portugal, eating cantaloupe raised the odds of Salmonella Saintpaul infection about fourteenfold (adjusted odds ratio 14.22, 95 percent confidence interval 2.83 to 71.43), on 25 cases against 100 controls, and 46 percent of the 98 cases were children under 10. On that many people the direction holds and the size does not.

The numbers, per 100 g

How much is actually in it

• Eight USDA reference samples of raw cantaloupe disagree by more than fivefold on vitamin C (3.9 to 18.4 mg per 100 g) and by thirteenfold on copper, while water content varies by only 3%. — Melons, cantaloupe, raw (FDC 746770), USDA Foundation Foods sample analyses (n = 8 samples for most nutrients, 7 for water and ash) Evidence E source
  Vitamin C 10.9 mg per 100 g with a range of 3.9 to 18.4 across 8 samples; beta-carotene 2780 ug with a range of 1870 to 4710; copper 0.085 mg with a range of 0.015 to 0.204; potassium 157 mg with a range of 76 to 266; water 90.2 g with a range of 88.8 to 91.5

What a real portion looks like

• A cup of cantaloupe balls is 155 g and a medium wedge is 70 g, so a whole medium melon at 550 g is roughly three and a half cups of fruit. — household measures recorded for Cantaloupe, raw in the USDA food and nutrient database for dietary studies (n = 10 household measures for FNDDS code 63109010) Evidence E source
  1 cup 155 g; 1 cube or 1 ball 15 g; small, medium and large wedge 35, 70 and 105 g; small, medium and large whole melon 440, 550 and 815 g

What your body absorbs

• In 30 patients who had hypocitraturia and formed kidney stones, one 385 mL drink of blended melon juice raised urinary citrate over the next 6 hours as much as orange juice did, and it also raised urinary potassium and pH, which lime juice did not. — 30 patients with hypocitraturia who already formed kidney stones, urine sampled 2, 4 and 6 hours after one 385 mL drink (n = 30 (10 per juice)) Evidence B source
  Comparable rises in mean urinary citrate across melon, orange and lime. Urinary potassium, pH and net gastrointestinal alkali absorption rose only after melon and orange. This is one drink measured over 6 hours in people with a stone-forming condition, so it does not carry over to healthy people and it is not evidence that melon prevents stones

What cooking and storage change

• A review of 29 inoculation experiments across 21 commodities found that whether Listeria grows on an uncut fruit depends on the commodity and on temperature, with melons among the most studied surfaces. — 29 laboratory studies of intact, uncut fruit and vegetable surfaces, melons among the four most studied groups (n = 29 studies from 3,459 screened citations, 21 commodities) Evidence D source
  Growth and survival differ substantially by commodity; temperature and surface characteristics had a considerable effect

What it does to your health

• Across three US cohorts with 3.5 million person-years, cantaloupe was the one whole fruit that moved the wrong way for type 2 diabetes: hazard ratio 1.10 (95% CI 1.02 to 1.18) per three servings a week, against 0.74 for blueberries. — 187,382 US nurses and health professionals free of major chronic disease at baseline, followed 1984 to 2009 (n = 187,382 participants, 12,198 incident cases of type 2 diabetes) Evidence C source
  Hazard ratio 1.10 (95% CI 1.02 to 1.18) per three servings per week of cantaloupe, against 0.74 (0.66 to 0.83) for blueberries and 0.93 (0.90 to 0.96) for apples and pears
• A 2023 review of 18 prospective cohorts, 451,291 people and 145,492 hypertension cases, put cantaloupe among the few fruits linked to higher risk rather than lower, on only 2 to 5 studies each. — 451,291 adults without hypertension at baseline, followed 3 to 28 years (n = 18 cohort studies, 451,291 participants, 145,492 hypertension cases) Evidence C source
  Fruit and vegetables overall 0.97 (0.95 to 0.99) per 200 g/day and fruit 0.93 (0.89 to 0.98), while cantaloupe sat among the positive associations, each subtype resting on 2 to 5 studies
• The only randomised trials on melon test a capsule and not the fruit: a 10 mg daily capsule of superoxide dismutase melon concentrate, taken for 12 weeks, lowered perceived stress in 61 healthy adults against placebo. — 61 healthy adults, 32 on the active supplement and 29 on placebo, 12 weeks (n = 61) Evidence B source
  Significantly lower perceived stress and less physical and mental fatigue on four psychometric scales against placebo; the abstract reports significance without effect sizes
• A second randomised trial of the same 10 mg melon concentrate capsule reports lower oxidative stress and C-reactive protein in trained healthy adults, with no number given for the human arm. The 38% and 28% drops in the abstract are results in rats. — healthy adults on a standardised training programme, plus a preclinical rat arm (n = not reported in the abstract for the human arm) Evidence B source
  The abstract reports a direction for the human arm and no size at all. The 38% drop in muscle fibrosis and the 28% drop in TNF-alpha are results from the rats, not from the people

Safety, limits and interactions

• In the 2023 UK and Portugal outbreak investigation, eating cantaloupe raised the odds of Salmonella Saintpaul infection about 14-fold (adjusted odds ratio 14.22, 95% CI 2.83 to 71.43), and 46% of the 98 cases were children under 10. — 25 UK cases and 100 age-matched controls recruited from a market research panel, September to November 2023 (n = 98 cases (93 UK, 5 Portugal), 25 in the case-control analysis, 100 controls) Evidence C source
  Adjusted odds ratio 14.22 (95% CI 2.83 to 71.43), p = 0.001; 13 of 25 cases reported blood in stool and 5 were hospitalised
• An Australian outbreak in 2006 found the same pattern even more sharply: cantaloupe eaters had 24 times the odds of Salmonella Saintpaul illness (adjusted OR 23.9, 95% CI 5.1 to 112.4), and the outbreak strain was found on the skin of two melons from the implicated retailer. — 36 confirmed cases and 106 controls across New South Wales, Victoria and the Australian Capital Territory (n = 36 cases, 106 controls) Evidence C source
  Adjusted odds ratio 23.9 (95% CI 5.1 to 112.4)

What people believe that the data does not support

• Two thirds of 60 patients with Behcet's disease named cantaloupe as a trigger for their mouth ulcers (66.7%), which is a belief measured by questionnaire and never tested against the food itself. — 60 adults with Behcet's disease at an outpatient clinic in Shiraz, Iran, interviewed face to face (n = 60) Evidence C source
  Eggplant 78.3%, melon 68.3%, walnut 68.2% and cantaloupe 66.7% named as triggers for oral aphthous ulcers

Who this works differently for

• After the 2011 Listeria outbreak traced to cantaloupe, an estimated 6,500 to 12,000 pregnant women in Colorado had eaten the recalled melons, and exactly one pregnancy-associated case followed, an attack rate near 1 per 10,000 exposed. — pregnant women in Colorado during the 2011 multistate listeriosis outbreak, including 1,060 surveyed about symptoms and exposures (n = 1,060 women surveyed; 6,500 to 12,000 estimated exposed) Evidence C source
  One laboratory-confirmed pregnancy-associated case, attack rate about 1 per 10,000 exposed pregnant women, with no significant rise in fetal death rate against pre-outbreak periods

What is still unknown

• Cantaloupe holds the third highest nitrate and nitrite level among fruits in a worldwide synthesis, 220.32 mg/kg, with a confidence interval running from minus 224.53 to 665.19. A lower bound below zero does not mean less than none, it means the measurement cannot be told apart from zero. — pooled measurements of nitrate and nitrite in vegetables and fruits worldwide (n = not stated in the abstract for cantaloupe specifically) Evidence D source
  Cantaloupe 220.32 mg/kg (95% CI -224.53 to 665.19), against wolfberry 2395.83 (1611.89 to 3179.77) and jackfruit 237.8 (202.88 to 272.71)

The bottom line

A cup of melon balls is 155 g and a medium wedge is 70 g, so a whole medium melon of about 550 g is roughly three and a half cups. Useful to know before you finish one standing at the counter. The risk with this fruit lives on the outside. In the 2006 Australian outbreak, cantaloupe eaters had about 24 times the odds of Salmonella Saintpaul illness (adjusted odds ratio 23.9), and the outbreak strain turned up on the skin of two melons from the retailer involved. The rind is netted, it sits on soil, and a knife carries whatever is on it into the flesh. We cannot tell you that scrubbing fixes that. What we hold on uncut fruit surfaces is a review of 29 laboratory experiments, and its finding was that growth depends on the commodity and on temperature. That review left out cut and processed fruit, which is the state the outbreaks involved, so keeping an opened melon cold is an inference from experiments on uncut fruit rather than a tested step, and no washing method has been tested at all. Pregnancy is the place where the number is calmer than the fear. After the 2011 listeriosis outbreak, an estimated 6,500 to 12,000 pregnant women in Colorado had eaten the recalled melons, and exactly one pregnancy-associated case followed, an attack rate near 1 per 10,000 exposed. Real, and small. It is also the only number on pregnancy this page holds, from one outbreak in one state. Two common beliefs about this fruit are still untested. Two thirds of 60 patients with Behcet disease named cantaloupe as a trigger for their mouth ulcers, which is an answer on a questionnaire and never a food challenge, so whether the melon causes the ulcers is unknown. Cantaloupe also sits third among fruits in a worldwide survey of nitrate and nitrite at 220.32 mg/kg, with a confidence interval running from minus 224.53 to 665.19. A lower bound below zero does not mean there is less than none of it. It means the measurement cannot be told apart from zero, so the level has not been pinned down and the ranking is empty. The gaps matter as much as the findings here. On absorption we hold one trial, and it was not done in people like most readers. Thirty patients who had hypocitraturia and already formed kidney stones drank 385 mL of blended melon juice once, and over the next six hours their urinary citrate rose as much as it did on orange juice, while urinary potassium and pH rose where lime juice did not. Read that as one drink in patients with a stone-forming condition, measured for six hours. It does not carry over to healthy people, and nobody has shown that melon prevents stones or treats them. That is the whole of what we have on what your body does with anything in this melon. Nothing on the sugar, nothing on whether its beta-carotene reaches the blood. We also have no card on cantaloupe for people with diabetes, kidney disease or a weakened immune system, and that last group is the one the outbreak record matters to most. If you are pregnant, on chemotherapy or otherwise immunocompromised, the pre-cut melon question belongs with the person treating you and not with a page like this one.

Sources

1. cant-r1-12 · reference dataset
   Melons, cantaloupe, raw - Vitamin C, total ascorbic acid 10.9 MG, range 3.9-18.4, n=8 - Carotene, beta 2780.0 UG, range 1870.0-4710.0, n=8 - Copper, Cu 0.085 MG, range 0.015-0.204, n=8 - Potassium, K 157.0 MG, range 76.0-266.0, n=8 - Water 90.2 G, range 88.8-91.5, n=7
   USDA FoodData Central, Foundation Foods, release 2026-04-30 · checked 2026-09-23
2. cant-r1-13 · reference dataset
   Cantaloupe, raw - FNDDS 63109010 - 1 cup 155 g - 1 cube 15 g - 1 ball 15 g - 1 small wedge/slice 35 g - 1 medium wedge/slice 70 g - 1 large wedge/slice 105 g - 1 small melon 440 g - 1 medium melon 550 g - 1 large melon 815 g
   USDA FNDDS, Cantaloupe raw, food code 63109010 · checked 2026-09-23
3. cant-r1-08 · randomised controlled trial
   Significant and comparable increases of mean urinary citrate were observed in all groups, whereas mean urinary potassium, pH, and NGIA were significantly increased only after consumption of melon and orange juices.
   J Endourol, 2012 · checked 2026-09-23
4. cant-r1-09 · systematic review of laboratory studies
   Synthesis of the reviewed studies suggests L. monocytogenes growth and survival on intact produce surfaces differ substantially by commodity...Parameters such as temperature and produce surface characteristics had a considerable effect on L. monocytogenes growth and survival dynamics.
   J Food Prot, 2020 · checked 2026-09-23
5. cant-r1-04 · prospective cohort study
   the pooled hazard ratios of type 2 diabetes for every three servings/week were 0.74 (0.66 to 0.83) for blueberries...and 1.10 (1.02 to 1.18) for cantaloupe
   BMJ, 2013 · checked 2026-09-23
6. cant-r1-05 · meta-analysis of prospective cohort studies
   Inverse associations were observed for apples or pears, blueberries, raisins or grapes, avocado, broccoli, carrots and lettuce, while positive associations were observed for cantaloupe, Brussels sprouts, cruciferous vegetables, and total and fried potatoes (n = 2-5).
   Eur J Nutr, 2023 · checked 2026-09-23
7. cant-r1-06 · randomised controlled trial
   A randomized, double-blind, placebo-controlled trial was performed on 61 people divided in two groups: active supplement (n = 32) and placebo (n = 29) for 12 weeks...One capsule contained 10 mg of SOD-melon concentrate (140 U of SOD) and starch for the active supplement and starch only for the placebo...The supplementation with SOD-melon concentrate significantly decreased perceived stress, compared to placebo.
   Nutrients, 2014 · checked 2026-09-23
8. cant-r1-07 · randomised controlled trial
   In the clinical study, melon concentrate was able to decrease oxidative stress and C-Reactive protein (CRP) plasma level.
   Int J Environ Res Public Health, 2020 · checked 2026-09-23
9. cant-r1-01 · case-control study
   Multivariable logistic regression analysis of food exposures in cases and controls identified a strong association with cantaloupe consumption (adjusted odds ratio: 14.22; 95% confidence interval: 2.83-71.43; p-value: 0.001).
   Epidemiol Infect, 2024 · checked 2026-09-23
10. cant-r1-02 · case-control study
    Consumption of cantaloupe (rockmelon) was strongly associated with illness (adjusted OR 23.9 95%, 95% CI 5.1-112.4).
    Epidemiol Infect, 2009 · checked 2026-09-23
11. cant-r1-10 · cross-sectional survey
    The most common foods reported as triggers for oral ulcers were eggplant (78.3%), melon (68.3%), walnut (68.2%), and cantaloupe (66.7%).
    J Med Life, 2020 · checked 2026-09-23
12. cant-r1-03 · outbreak surveillance and survey
    One laboratory-confirmed case of listeriosis was associated with pregnancy...Approximately 6,500-12,000 pregnant women in Colorado might have eaten the contaminated cantaloupes, an attack rate of ~1 per 10,000 exposed pregnant women.
    Infect Dis Obstet Gynecol, 2015 · checked 2026-09-23
13. cant-r1-11 · meta-analysis of composition measurements
    The highest concentration (mean and 95%CI) of nitrate/nitrite was determined in Rocket (4825.15; 3044.14-6606.16), Mizuna (3500; 2702.48-4297.52), and Bok choy (3407.40; 2841.39-3973.42) in vegetable group and in wolfberry (2395.83; 1611.89-3179.77), Jack fruit (237.8; 202.88-272.71) and Cantaloupe (220.32; -224.53 to 665.19) in fruits group.
    Ecotoxicol Environ Saf, 2023 · checked 2026-09-23