Propel Zero: judged by its two sweeteners

Nobody has run a trial on Propel Zero itself, so this page reads the evidence on what makes it sweet, sucralose and acesulfame K. A network meta-analysis pooled 36 single-drink trials in 472 mostly healthy people, and drinks sweetened this way, blends of the two included, left blood glucose and insulin after the drink no different from water. Confidence in that result is low to moderate, and some of the trials were not randomized. Sucralose alone was tested in 10 short randomized trials of 8 to 61 healthy adults each. Fasting glucose, insulin resistance and gut bacterial diversity showed no significant change, although the interval for diversity was wide (standardized difference 0.00, 95% CI -1.16 to 1.15). The calorie question depends on what the drink replaces. In a meta-analysis of randomized trials in adults, whose abstract does not say how many trials it pooled, sweeteners instead of sugar cut total energy intake by about 175 calories a day (95% CI 54 to 296). Sweeteners instead of water made no significant difference.

The numbers, per 3.5 oz (100 g)

What your body absorbs

• Laboratory and pharmacokinetic data suggest that about 85% of ingested sucralose reaches the colon without being metabolized. — Not stated in the abstract (background statement) Evidence D source
  About 85% of intake reaches the colon unmetabolized

What it does to your health

• A meta-analysis of randomized trials in healthy adults found that sucralose did not change gut microbial alpha diversity, fasting glucose or HOMA-IR. — Healthy adults in 10 short-term RCTs with 8-61 participants each (n = 10 RCTs) Evidence A source
  Shannon SMD -0.00 (95% CI -1.16 to 1.15); fasting glucose SMD -0.04 (-0.63 to 0.56); HOMA-IR SMD -0.13 (-0.36 to 0.10)
• A network meta-analysis of 36 acute trials found that drinks sweetened with non-nutritive sweeteners, including acesulfame K plus sucralose blends, had no effect on blood glucose or insulin, similar to water. — 472 predominantly healthy participants in 36 acute single-exposure trials (n = 472) Evidence B source
  No difference from water in postprandial glucose, insulin, GLP-1, GIP, PYY, ghrelin and glucagon responses (low to moderate confidence)
• A meta-analysis of randomized trials in adults found that non-nutritive sweeteners lowered total energy intake by 175 calories a day compared with sugar but not compared with water. — Adults in RCTs searched up to September 2024 Evidence A source
  Vs sugar -175.26 calories/day (95% CI -296.47 to -54.06); vs water +29.94 calories/day (95% CI -70.37 to 130.24)
• In a crossover RCT in 20 healthy adults, a 10 fl oz (300 mL) water preload with acesulfame K led to lower total energy intake at the next meal than a sucrose preload and did not differ from water. — 20 healthy normal-weight adults, single preload of 0.1675 g ace-K in 10 fl oz (300 mL) water (n = 20) Evidence B source
  Total energy intake lower vs sucrose (pTukey < 0.03), no difference vs water
• Laboratory, animal and plaque pH studies suggest that sucralose itself does not cause tooth decay. — Oral bacteria, animal caries models and human plaque in situ Evidence D source
  Non-cariogenic (qualitative)

Safety, limits and interactions

• According to EFSA, the acceptable daily intake of acesulfame K is 15 mg per kg body weight per day, up from 9 mg set in 2000. — All population groups (EU) Evidence E source
  ADI 15 mg/kg bw per day (previously 9 mg/kg bw per day)
• According to the FDA, sucralose has been approved in the United States as a general-purpose sweetener since 1999. — US food supply Evidence E source
  Approved in 15 food categories in 1998, general purpose in 1999

What people believe that the data does not support

• In a 6 month RCT in 180 adults, eating a low, regular or high share of sweet foods, including low-calorie sweeteners, did not change liking for sweet taste. — 180 healthy adults (123 women, 57 men), 6 months plus 4 month follow-up (n = 180) Evidence B source
  No between-group difference in sweet taste liking (P = 0.56), energy intake (P = 0.24) or body weight (P = 0.16)
• Observational data from 90 studies show no consistent association between acesulfame K, sucralose or other sweeteners and any cancer, with no dose-response. — 90 epidemiology studies of acesulfame K, aspartame, cyclamate, saccharin, sucralose or sweeteners in aggregate (n = 90 studies) Evidence C source
  No consistent association with any of 17 cancer types; no dose-response
• US labeling rules let a food sweetened with sucralose state that sucralose, unlike sugars, does not promote tooth decay. — US food supply, foods meeting the 21 CFR 101.80 conditions Evidence E source
  Authorized health claim: sucralose does not promote tooth decay (qualitative)
• In the EU, drinks sweetened with sucralose instead of sugar may state that they cause a lower blood glucose rise than sugar-sweetened drinks. — EU food supply Evidence E source
  Authorized claim, comparison with sugar-containing drinks (no size)
• In the EU, drinks sweetened with sucralose instead of sugar may state that this helps maintain tooth mineralisation. — EU food supply Evidence E source
  Authorized claim, versus sugar (qualitative)
• The EU refused drinks with intense sweeteners the right to claim that they help blood glucose control or have no effect on insulin secretion. — EU food supply Evidence E source
  Claim refused (Non-authorized)
• The EU refused drinks with intense sweeteners the right to claim that they help maintain a healthy body weight or control calorie intake. — EU food supply Evidence E source
  Claim refused (Non-authorized)

Who this works differently for

• In a Cochrane review of people with diabetes, non-nutritive sweeteners versus placebo for 4 to 10 months changed HbA1c by 0% (4 trials, 360 participants, very low certainty). — People with type 1 or type 2 diabetes, 9 RCTs, 979 randomized, 4-10 months (n = 360) Evidence A source
  HbA1c MD 0% (95% CI -0.1 to 0.1), 4 trials, 360 participants, very low certainty

What is still unknown

• A Cochrane review of 9 trials in 979 people with diabetes found no data on diabetes complications, all-cause mortality or quality of life with non-nutritive sweeteners. — People with type 1 or type 2 diabetes, 9 RCTs (n = 979) Evidence A source
  Outcomes not reported in any included trial

The bottom line

So if Propel Zero replaces a sugary drink, the data point to fewer calories, and if it replaces water, they point to nothing gained. One crossover trial in 20 healthy adults fits that picture from a single test meal: 10 fl oz (300 mL) of water with acesulfame K before eating led to less food at that meal than a sucrose drink and the same as plain water. Two common fears have been tested. Over 6 months in 180 adults, eating a low, usual or high share of sweet foods did not change how much they liked sweet taste (P = 0.56), though that trial mixed sugars, sweeteners, fruit and dairy. A review of 90 observational studies found no consistent link between acesulfame K, sucralose or other sweeteners and any of 17 cancer types, and no dose-response. That is association data built on self-reported intake. In people with type 1 or type 2 diabetes, a Cochrane review found that sweeteners against placebo for 4 to 10 months moved HbA1c by 0% (95% CI -0.1 to 0.1) in 4 trials with 360 people, and rated that evidence very low certainty. None of its 9 trials reported complications, deaths or quality of life, so the long-term question in diabetes stays open. What the label may say is narrower than what the bottle suggests. US rules let a food sweetened with sucralose state that sucralose, unlike sugars, does not promote tooth decay. That permission covers the sweetener and says nothing about a flavored drink as a whole. In the EU, drinks that use sucralose in place of sugar may claim a lower blood glucose rise than a sugared drink and may claim to help keep teeth mineralised, and both claims compare with sugar only. The EU refused two broader claims for drinks with intense sweeteners. One said they help blood glucose control or leave insulin secretion untouched. The other said they help keep a healthy weight or control calorie intake. A refusal means the dossier did not satisfy the assessors. It is no evidence that the sweeteners raise glucose or weight, and the trials above found no glucose change against water. Who should be careful: the safety evidence here is regulatory. EFSA, in its 2025 re-evaluation, sets the acceptable daily intake of acesulfame K at 15 mg per kg of body weight a day for all population groups, replacing the 9 mg set in 2000, a limit derived from a rat study. The FDA has allowed sucralose as a general-purpose sweetener since 1999. We found no card on pregnancy, children or drug interactions for this drink, and that silence is a gap in the evidence that should not be read as reassurance. Laboratory, animal and plaque studies suggest sucralose does not cause tooth decay, though they tested the sweetener alone and never a flavored drink. About 85% of sucralose is said to reach the colon unmetabolised, a figure from the background line of a review and not from a study we could read.

Sources

1. prz-local-r2-02 · Pharmacokinetic background
   Sucralose is a widely consumed non-nutritive sweetener, with approximately 85% reaching the colon unmetabolized and directly interacting with the gut microbiota.
   Int J Mol Sci, 2026 · checked 2026-09-28
2. prz-local-r2-01 · Meta-analysis of RCTs
   Ten randomized controlled trials involving 8-61 participants per study (total across intervention and control groups) met the inclusion criteria; seven provided data for meta-analysis. 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 2026-09-28
3. prz-local-r2-03 · Network meta-analysis
   Thirty-six trials involving 472 predominantly healthy participants were included. ... 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 2026-09-28
4. prz-local-r2-06 · Meta-analysis of RCTs
   The results showed a reducing effect of NNSs consumption vs. sugar on total energy intake [total energy intake change = -175.26 kcal/day, 95% confidence interval (CI): -296.47 to -54.06, I2 = 61.19%] and carbohydrate intake [Hedges' g = -0.35, 95% CI: -0.63 to -0.06, I2 = 58.99%]. While, NNSs intake vs. water was not associated with significant change in total energy intake [total energy intake change = 29.94 kcal/day, 95% CI: -70.37 to 130.24, I2 = 34.98%]
   Front Nutr, 2024 · checked 2026-09-28
5. prz-local-r2-09 · Crossover RCT
   RESULTS: Total energy intake was lower in response to xylitol and ace-K compared to sucrose (pTukey < 0.03), with no differences between xylitol and ace-K or water.
   Nutrients, 2025 · checked 2026-09-28
6. prz-local-r2-10 · Review of lab and animal studies
   These include an examination of oral bacterial metabolism, experimental caries in animal models, and the effect of sucralose-containing solutions on human plaque pH in situ. The sum of these studies demonstrates that sucralose is non-cariogenic.
   J Clin Dent, 2002 · checked 2026-09-28
7. prz-local-r2-11 · Agency opinion
   The acceptable daily intake (ADI) considered safe for all population groups was set at 15 mg/kg body weight (bw) per day. This ADI replaces the one set by the SCF in 2000 at 9 mg/kg bw per day.
   EFSA, Re-evaluation of acesulfame K (E 950) as food additive, 2025 · checked 2026-09-28
8. prz-local-r2-12 · Agency statement
   The FDA approved sucralose for use in 15 food categories in 1998 and for use as a general-purpose sweetener for foods in 1999
   FDA, Aspartame and Other Sweeteners in Food · checked 2026-09-28
9. prz-local-r2-07 · RCT
   However, from baseline to month 6, no differences between groups were found in sweet taste liking ( χ2(40) = 37.9, P = 0.56), sweet taste intensity perception (χ2(40) = 20.7, P = 0.99), sweet food choice (χ2(10) = 10.1, P = 0.43), energy intake (χ2(10) = 12.7, P = 0.24), body weight (χ2(10) = 14.3, P = 0.16)
   Am J Clin Nutr, 2026 · checked 2026-09-28
10. prz-local-r2-08 · Systematic review of observational studies
    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 2026-09-28
11. prz-sup-r1-13 · federal regulation
    Frequent eating of foods high in sugars and starches as between-meal snacks can promote tooth decay. 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 2026-09-28
12. prz-sup-r1-14 · regulatory register entry
    POL-HC-6467 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* induces a lower blood glucose rise after their consumption compared to sugar-containing foods/drinks * In the case of D-tagatose and isomaltulose this should read ""other sugars"" Authorised
    EU Register on nutrition and health claims, claim POL-HC-6467, snapshot 2026-09-21 · checked 2026-09-28
13. prz-sup-r1-15 · regulatory register entry
    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 2026-09-28
14. prz-sup-r1-16 · regulatory register entry
    POL-HC-8015 Table top sweeteners and foods beverages containing intense sweeteners -intense sweeteners have no effect on carbohydrate metabolism, short or long-term blood glucose control or insulin secretion; -product [x] assists in blood glucose control. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-8015, snapshot 2026-09-21 · checked 2026-09-28
15. prz-sup-r1-17 · regulatory register entry
    POL-HC-8016 Table top sweeteners and foods beverages containing intense sweeteners -intense sweetners help to maintain a healthy body weight; -intense sweetners help to control calorie intake. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-8016, snapshot 2026-09-21 · checked 2026-09-28
16. prz-local-r2-04 · Cochrane review of RCTs
    Five trials compared NNS with placebo. The MD for HbA1c was 0%, 95% CI -0.1 to 0.1; P = 0.99; 4 trials; 360 participants; very low-certainty evidence.
    Cochrane Database Syst Rev, 2020 · checked 2026-09-28
17. prz-local-r2-05 · Cochrane review of RCTs
    The included trials did not report data on health-related quality of life, diabetes complications, all-cause mortality, or socioeconomic effects.
    Cochrane Database Syst Rev, 2020 · checked 2026-09-28