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Sucralose: little effect on blood sugar in short trials, one notable exception

A 2026 meta-analysis of 10 short randomized trials in healthy adults found that sucralose did not change fasting glucose (SMD -0.04, 95% CI -0.63 to 0.56), insulin resistance or the diversity of gut bacteria. The trials were small, and they compared sucralose with different things. A network meta-analysis of 36 single-drink trials in 472 mostly healthy people agrees that sweetened drinks behaved like water on glucose and insulin over the next two hours, with low to moderate confidence. One well-known trial does not fit. In 120 healthy adults who did not normally use sweeteners, two weeks of sucralose sachets below the acceptable daily intake impaired glucose responses as a group and changed the gut microbiome, with responses that differed from person to person. Those sachets carried glucose as a filler, and the trial lasted two weeks. We found no long-term trial of sucralose on diabetes, heart disease or cancer, so the question stays open.

Every statement here is tied to a source. The badge says what kind of evidence stands behind it: A is a meta-analysis or systematic review, E is the position of an expert body without its own analysis. How we verify →

We have no USDA entry for sucralose itself in this cohort. The evidence below stands on published studies rather than on a composition table, and we would rather say that than show you a number for something else.

What a real portion looks like

What your body absorbs

What cooking and storage change

What it does to your health

Safety, limits and interactions

What people believe that the data does not support

Who this works differently for

What is still unknown

The bottom line

The idea that sweeteners train you to crave sweet food was tested for six months in 180 adults. Eating more or fewer sweet foods did not change liking for sweet taste (P = 0.56) or body weight, though sweetness came from sugars and sweeteners together. In 20 adults, drinks paired with sucralose became as liked and wanted as those paired with sugar. After a single 10 fl oz (300 mL) drink, 74 young adults showed one difference by sex, since women ate more at a buffet after sucralose than after sugar and men did not. In 23 male cyclists, sucralose before exercise did not change how much carbohydrate they burned from a sports drink. In 11 healthy adults, a sugar drink raised blood endotoxin and a sucralose drink did not, though 7 of 18 recruits dropped out. A packet weighs about 1 g, and most of that is carrier powder. On teeth, US labels may say that sucralose does not promote tooth decay, and the EU allows a claim that sweeteners used instead of sugar help keep teeth mineralised. The EU refused a claim that a sucralose table-top sweetener helps with slimming. On safety, EFSA reviewed sucralose again in 2026 and kept the acceptable daily intake at 15 mg per kg of body weight, with average and high intakes below it. EFSA also cites a German review finding that sucralose heated to about 120 to 250 C loses chlorine and may form chlorinated compounds with potential health risk, in amounts nobody has pinned down in real food, and EFSA could not conclude that its use in baked goods is safe. A review of 90 observational studies found no consistent link between sucralose or other sweeteners and any cancer. In 157 people with cancer on immunotherapy, intake above 0.16 mg per kg a day went with shorter time before the disease progressed (8.0 against 13.0 months in melanoma). That is an observational finding with a cutoff chosen from the data and a mechanism shown only in mice. Among Chilean 3-year-olds, 63% had sucralose on the day recorded, mostly from drinks. Italian clinics for hereditary fructose intolerance disagree on it, with 33% banning it and 20% allowing it. We have no card on pregnancy or on interactions with medicines.

Questions about sucralose, answered from the trials

Sources

  1. ev-sucg-02 · RCT
    One-third of all pregnant women consumed LCS across each trimester of pregnancy.
    Eur J Clin Nutr, 2022 · checked 2026-10-07
  2. ev-sucg-08 · cross-sectional
    The most consumed sweetener was sucralose (95.6%), followed by acesulfame k (80.6%), stevia (78.3%), aspartame (75.1%), saccharin (14.8%), and cyclamate (10%). ... No pregnant woman in the sample exceeded the acceptable daily intake and there were no differences in sweetener consumption by trimester of pregnancy or by socioeconomic level.
    Nutr Hosp, 2019 · checked 2026-10-07
  3. sclr-daily-r8-20 · dataset
    1 individual packet: 1 g
    USDA FNDDS 2021-2023, food code 91107000, Sugar substitute, sucralose, powder (fdc 2710263) · checked 2026-09-29
  4. sclr-daily-r8-09 · RCT, crossover
    Average CHOexog during the first hour of exercise did not differ between SUCRA and CON conditions (0.226 ± 0.081 g/min vs. 0.212 ± 0.076 g/min, Δ =0.015 g/min, 95% CI -0.008 g/min, 0.038 g/min, p = .178).
    Int J Sport Nutr Exerc Metab, 2013 · checked 2026-09-29
  5. sclr-daily-r8-12 · agency opinion
    The BfR concluded that the results of the reviewed studies indicated that, when heated to temperatures of approx. 120°C–250°C, sucralose (E 955) is dechlorinated, possibly leading to the generation of chlorinated organic compounds exhibiting potential health risk (e.g. polychlorinated dibenzo‐p‐dioxins (PCDDs), dibenzofurans (PCDFs) or chloropropanols).
    EFSA Journal 2026, Re-evaluation of sucralose (E 955) as a food additive · checked 2026-09-29
  6. ev-sucg-03 · prospective cohort
    The adjusted model showed a significant association between the consumption of any NNS and sucralose and the risk of GDM (OR for any NNS = 1.58; 95% CI: 1.10-2.26; P = 0.014; OR sucralose = 1.44; 95% CI 1.06-1.95; P = 0.020).
    Nutrition, 2024 · checked 2026-10-07
  7. ev-sucg-10 · prospective cohort
    Compared with no consumption, daily consumption of artificially sweetened beverages was associated with a 0.20-unit increase in infant BMI z score (adjusted 95% CI, 0.02-0.38) and a 2-fold higher risk of infant overweight at 1 year of age (adjusted odds ratio, 2.19; 95% CI, 1.23-3.88).
    JAMA Pediatr, 2016 · checked 2026-10-07
  8. sclr-daily-r8-01 · meta-analysis of RCTs
    Sucralose did not significantly alter alpha diversity (Shannon index: SMD = -0.00; 95% CI -1.16 to 1.15; p = 0.99; I2 = 25.67%), fasting blood glucose (SMD = -0.04; 95% CI = -0.63 to 0.56; p = 0.88; I2 = 69.61%), and HOMA-IR (SMD = -0.13; 95% CI = -0.36 to 0.10; p = 0.212; I2 = 0.00%).
    Int J Mol Sci, 2026 · checked 2026-09-29
  9. sclr-daily-r8-02 · network meta-analysis
    In uncoupling interventions, NNS beverages (single or blends) had no effect on postprandial glucose, insulin, GLP-1, GIP, PYY, ghrelin, and glucagon responses similar to water controls (generally, low to moderate confidence)
    Nutrients, 2023 · checked 2026-09-29
  10. sclr-daily-r8-04 · RCT, crossover
    The intake of the sucrose-sweetened beverage resulted in a significant increase in plasma endotoxin levels while being unchanged after the intake of sucralose-sweetened beverages.
    Nutrients, 2023 · checked 2026-09-29
  11. sclr-daily-r8-05 · clinical trial
    Significant differences were observed in insulin, glucose, and acylated ghrelin concentrations over time only between sucrose-containing treatments and non-sucrose-containing treatments regardless of sucralose consumption.
    Nutr Res, 2011 · checked 2026-09-29
  12. sclr-daily-r8-14 · review
    The sum of these studies demonstrates that sucralose is non-cariogenic.
    J Clin Dent, 2002 · checked 2026-09-29
  13. sclr-daily-r8-11 · agency opinion
    Taking into account the available dataset, the Panel concluded that there is no need to change the current ADI of 15 mg/kg bw per day of sucralose (E 955).
    EFSA Journal 2026, Re-evaluation of sucralose (E 955) as a food additive · checked 2026-09-29
  14. ev-sucg-12 · agency opinion
    Taking into account the available dataset, the Panel concluded that there is no need to change the current ADI of 15 mg/kg bw per day of sucralose (E 955).
    EFSA Journal 2026, Re-evaluation of sucralose (E 955) as a food additive · checked 2026-10-07
  15. ev-sucg-14 · agency position
    To determine the safety of sucralose, the FDA reviewed more than 110 studies designed to identify possible toxic effects, including studies on the reproductive and nervous systems, carcinogenicity, and metabolism.
    US FDA, Aspartame and Other Sweeteners in Food · checked 2026-10-07
  16. ev-sucg-15 · agency position
    Based on the available scientific evidence, sweeteners authorized by the FDA are safe for the general population under certain conditions of use.
    US FDA, Aspartame and Other Sweeteners in Food · checked 2026-10-07
  17. sclr-daily-r8-07 · RCT
    However, from baseline to month 6, no differences between groups were found in sweet taste liking ( χ2(40) = 37.9, P = 0.56)
    Am J Clin Nutr, 2026 · checked 2026-09-29
  18. sclr-daily-r8-08 · RCT, crossover
    After conditioning, explicit wanting and liking ratings increased, with no differences between the sweeteners.
    Physiol Behav, 2026 · checked 2026-09-29
  19. sclr-daily-r8-13 · systematic review
    We found no consistent associations between any NSS or NSSs in aggregate and any cancer overall, and no evidence for dose-response.
    Adv Nutr, 2025 · checked 2026-09-29
  20. sclr-daily-r8-15 · regulation
    Sucralose, the sweetening ingredient used to sweeten this food, unlike sugars, does not promote tooth decay.
    21 CFR 101.80, Health claims: dietary noncariogenic carbohydrate sweeteners and dental caries · checked 2026-09-29
  21. sclr-daily-r8-16 · regulatory decision
    POL-HC-6466 Sugar replacers, i.e. intense sweeteners; xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, sucralose and polydextrose; D-tagatose and isomaltulose Consumption of foods/drinks containing instead of sugar* contributes to the maintenance of tooth mineralisation * In the case of D-tagatose and isomaltulose this should read ""other sugars"" Authorised
    EU Register on nutrition and health claims, claim POL-HC-6466, snapshot 2026-09-21 · checked 2026-09-29
  22. sclr-daily-r8-17 · regulatory decision
    POL-HC-7623 Name of Food product: Low Calorie Sweetener / Table-top Sweetener (Granular & tablets - sucralose based) Description of food in terms of food legislation categories: food not covered by specific food legislation Was food on Irish market before 1st July 20 Exact wording of claim as it appears on product: Splenda can help with slimming as part of a calorie controlled diet. Splenda is also suitable for those following a low carbohydrate diet. In France, 'peut contributer a une reduction de l'apport calorique quotidien' Examples of any alternative wording that may be used in relation to claim: Splenda low calorie sweetener can help to maintain a healthy body weight as part of a calorie-controlled diet. Splenda low calorie sweetener helps to control calorie intake as part of a calorie controlled diet. Is claim a picture: No Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7623, snapshot 2026-09-21 · checked 2026-09-29
  23. ev-sucg-04 · cross-sectional
    Conversely, infants born from mothers who heavily consumed sucralose displayed a significant increase in birth weight compared to that found in newborns from mothers who lightly ingested sucralose (3.2 ± 0.6 vs. 2.8 ± 0.1, p = 0.0005) (Table 1).
    Biomedicines, 2023, Newborns from Mothers Who Intensely Consumed Sucralose during Pregnancy Are Heavier · checked 2026-10-07
  24. ev-sucg-06 · clinical study
    Due to one mother having extremely high concentrations, peak sucralose concentrations following ingestion of diet soda ranged from 4.0–7,387.9 ng/mL (median peak 8.1 ng/mL) and the AUC ranged from 526.1 – 2,337,351 ng/mL (median AUC 1244.2 ng/mL).
    Journal of Pediatric Gastroenterology and Nutrition, 2018, Pharmacokinetics of Sucralose and Acesulfame-Potassium in Breast Milk Following Ingestion of Diet Soda · checked 2026-10-07
  25. ev-sucg-07 · cross-sectional
    Saccharin, sucralose, and acesulfame-potassium were present in breast milk of 65% of participants, most of whom reported NNS intake during the day prior to donating a breast milk sample.
    Journal of Toxicology and Environmental Health Part A, 2015, Nonnutritive Sweeteners in Breast Milk · checked 2026-10-07
  26. sclr-daily-r8-03 · RCT
    As groups, each administered NNS distinctly altered stool and oral microbiome and plasma metabolome, whereas saccharin and sucralose significantly impaired glycemic responses.
    Cell, 2022 · checked 2026-09-29
  27. sclr-daily-r8-06 · RCT, crossover
    Female participants consumed greater total calories (β, 1.73; 95% CI, 0.38 to 3.08; P = .01), whereas caloric intake did not differ in male participants (β, 0.68; 95% CI, -0.99 to 2.35; P = .42) after sucralose vs sucrose ingestion.
    JAMA Netw Open, 2021 · checked 2026-09-29
  28. sclr-daily-r8-10 · cohort
    Commensurately, high sucralose intake (>0.16 mg/kg/day) was significantly associated with poorer PFS in both ICI-treated advanced cutaneous melanoma (median 13.0 vs. 8.0 months, log-rank P = 0.037) and NSCLC (median 18.0 vs. 7.0 months, log-rank P = 0.034; Fig. 1D and E).
    Cancer Discovery, 2025, Sucralose Consumption Ablates Cancer Immunotherapy Response through Microbiome Disruption · checked 2026-09-29
  29. sclr-daily-r8-18 · cross-sectional
    Seventy-six percent of the toddlers consumed at least one NNS: 63% sucralose, 35% acesulfame-K, 32% aspartame, 27% steviol, < 1% saccharin and < 1% cyclamate.
    Pediatr Obes, 2025 · checked 2026-09-29
  30. sclr-daily-r8-19 · survey
    sucralose (prohibited 33.3%, permitted 20.0%, restricted 20.0%, unspecified 26.7%)
    Nutrients, 2026 · checked 2026-09-29
  31. ev-sucg-01 · meta-analysis
    Most health outcomes did not seem to have differences between the NSS exposed and unexposed groups.
    BMJ, 2019 · checked 2026-10-07
  32. ev-sucg-05 · clinical study
    We found that fetal plasma concentrations had a significant, positive, linear dependency on the maternal plasma concentrations of all four artificial sweeteners, with adjusted coefficients of 0.49 (CI: 0.28–0.70) for acesulfame, 0.72 (CI: 0.48–0.95) for cyclamate, 0.51 (CI: 0.38–0.67) for saccharin, and 0.44 (0.33–0.55) for sucralose (Figure 2 and Table 3).
    Nutrients, 2023, Transplacental Transport of Artificial Sweeteners · checked 2026-10-07
  33. ev-sucg-09 · prospective cohort
    We found increased odds of overweight in 7-, 11-, 14- and 18-year-old offspring whose mothers reported drinking ≥ 1 artificially sweetened beverage daily during pregnancy compared with no consumption (18 years: adjusted OR 1·26 (95 % CI 1·12, 1·42)).
    Br J Nutr, 2025 · checked 2026-10-07
  34. ev-sucg-11 · animal study
    It was found that the proportion of pregnant mice bearing offspring with heart defects was much higher in the sucralose group (71.4%, 10 out of 14) than that in the control group (14.3%, 2 out of 14) (Figures 1A and 1B).
    iScience, 2026, High sucralose exposure in early pregnancy increases the susceptibility of heart defects in mice offspring · checked 2026-10-07
  35. ev-sucg-13 · agency opinion
    In the case of the HOCs with data available only from animal studies (namely ‘haematotoxicity’, ‘reproductive toxicity’, ‘maternal and developmental toxicity’ and ‘neurotoxicity’) the integration of evidence was done considering the option ‘missing data’
    EFSA Journal 2026, Re-evaluation of sucralose (E 955) as a food additive · checked 2026-10-07

Review. Reviewed on 2026-09-29 for evidence level, dose and population context, and claims a reader could misread. Bioma Learn has no human medical reviewer at this time, and we say so rather than invent one. Methodology. This is information, not medical advice.