Sweeteners · Metabolic & Cardiometabolic
non-nutritive and artificial sweeteners induces cephalic-phase insulin response via sweet-taste receptors despite zero calories
In plain terms: Do zero-calorie sweeteners still spike insulin just from tasting sweet?
Refuted Sweeteners 🔬 Includes disconfirming
RefutedContestedStrong support
consensus score -0.63
No — controlled trials and meta-analyses show non-nutritive sweeteners cause little to no acute rise in glucose or insulin, so a meaningful cephalic-phase insulin surge from sweet taste alone is not supported.
📅 Last reviewed: 2026-07-14 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
1 support 9 contradict 3 tested null 3 mixed · 16 sources, 10 independent groups · 1 superseded — pooled inside a review, counted once
What the evidence shows
Controlled trials do not support a cephalic-phase insulin response to sweet taste without calories: a systematic review of 50 human studies of food-cue insulin responses and a network meta-analysis of sweetened beverages both find no meaningful acute glucose or insulin rise. Some gut-hormone signalling does occur, with diet soda raising GLP-1 in youths, which is a different claim.
The evidence (18)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Sae Iab T, Dando R 2020 · Foods (Basel, Switzerland) | RCT | mixed | low | Small crossover pilot (n=10) comparing water, sucrose, sucralose, and maltodextrin preloads; plasma glucose (not insulin) was measured, and glucose spiked only in the absence of sweet taste (maltodextrin, calories without sweetness), while |
| Lasschuijt MP, Mars M, de Graaf C, Smeets PAM 2020 · Advances in nutrition (Bethesda, Md.) | meta-analysis | contradicts | high | Systematic review (PRISMA) of 50 human studies on cephalic phase insulin responses (CPIR) to food cues (including sweet taste/NNS); an insulin rise (>=1 uIU/mL) occurred in only 41% of treatments and was statistically significant from basel |
| Brown RJ, Walter M, Rother KI 2012 · Diabetes Care | RCT | tested-null | low | Diet soda (sucralose/ace-K) increased GLP-1 secretion in youths — evidence of some sweet-taste gut-hormone signaling, but this is incretin not a cephalic insulin spike, and did not raise insulin problematically. |
| McGlynn ND, Khan TA, Wang L, Zhang R, Chiavaroli L, Au-Yeung F, Lee JJ, Noronha JC, Comelli EM, Blanco Mejia S, Ahmed A, Malik VS, Hill JO, Leiter LA, Agarwal A, Jeppesen PB, Rahelic D, Kahleová H, Salas-Salvadó J, Kendall CWC, Sievenpiper JL 2022 · JAMA Netw Open | meta-analysis | tested-null | high | Substituting NNS beverages for sugary drinks improved weight and cardiometabolic risk vs no metabolic-syndrome harm — opposite of the predicted insulin-driven harm. |
| Zhang R, Noronha JC, Khan TA, McGlynn N, Back S, Grant SM, Kendall CWC, Sievenpiper JL 2023 · Nutrients | meta-analysis | contradicts | high | Network meta-analysis: non-nutritive sweetened beverages had no adverse postprandial glucose/insulin/incretin effect relative to water. |
| Ford HE, Peters V, Martin NM, Sleeth ML, Ghatei MA, Frost GS, Bloom SR 2011 · Eur J Clin Nutr | RCT | contradicts | moderate | Oral ingestion of sucralose did not raise plasma insulin, GLP-1 or PYY in healthy subjects. ↩ SUPERSEDED — pooled in the review above, counted once |
| Lertrit A, Srimachai S, Saetung S, Chanprasertyothin S, Chailurkit LO, Areevut C, Katekao P, Ongphiphadhanakul B, Sriphrapradang C 2018 · Nutrition | RCT | contradicts | moderate | OFF-SCOPE: sucralose was given as swallowed pills (200 mg/d x 4 wk) before a glucose OGTT/IVGTT, so no sweet taste reached oral receptors and no cephalic-phase (pre-absorptive) insulin response was measured. Measured outcomes: Matsuda insulin sensitivity lower (4.69 vs 5.31, P < 0.005), IVGTT acute insulin response lower (58.9 vs 69.94 µU/mL, P < 0.001), GLP-1 AUC higher. (Prior extract stating no change was wrong.) |
| Abdallah L, Chabert M, Louis-Sylvestre J 1997 · Am J Clin Nutr | RCT | contradicts | moderate | Sucking an aspartame sweet tablet produced no cephalic-phase insulin release in normal-weight men. |
| Otsuki T, Okihara K, Nomura K, Matsui S, Taruno A, Sasaki T 2026 · The journal of physiological sciences : JPS | animal | contradicts | moderate | In mice, 2 days of NNS consumption impaired reinforced cephalic phase insulin release (CPIR) that had been conditioned by glucose-solution pairing, and worsened glucose tolerance. NNS did not trigger/enhance CPIR themselves; instead they bl |
| Gómez-Arauz AY, Bueno-Hernández N, Palomera LF, Alcántara-Suárez R, De León KL, Méndez-García LA, Carrero-Aguirre M, Manjarrez-Reyna AN, Martínez-Reyes CP, Esquivel-Velázquez M, Ruiz-Barranco A, Baltazar-López N, Islas-Andrade S, Escobedo G, Meléndez G 2019 · J Diabetes Res | RCT | supports | low | A single 48 mg sucralose sip stimulated insulin secretion during an OGTT in healthy young adults, providing limited support for a taste-triggered response. |
| Glendinning JI, Stano S, Holter M, Azenkot T, Goldman O, Margolskee RF, Vasselli JR, Sclafani A 2015 · Am J Physiol | animal | contradicts | high | In mice, sugar-induced cephalic insulin release occurred via a sweet-receptor-independent pathway and artificial sweeteners did not trigger it, arguing against taste-alone insulin spikes. |
| Pullicin AJ, Wils D, Lim J 2023 · Appetite | RCT | mixed | moderate | Glucose and maltodextrin elicited cephalic insulin release requiring both glucose sensing and sweet taste, so sweetness alone is insufficient to guarantee the response. |
| Greyling A, Appleton KM, Raben A, Mela DJ 2020 · Am J Clin Nutr | meta-analysis | contradicts | high | Meta-analysis of RCTs: low-energy sweeteners produced no acute rise in blood glucose or insulin vs control. |
| Pullicin AJ, Lim J 2026 · Physiol Behav | observational | tested-null | moderate | 28 healthy adults, three sessions of oral glucose, fructose or sucralose stimulation, pre-post insulin and c-peptide; no non-sweet control session described. Underpowered trend: sucralose 'induced only a trending or non-significant increase (c-peptide, p = 0.08; insulin, p > 0.10)' at 2 min, while glucose and fructose were significant. Each person's 'highest (peak)' change was significant for all three (p < 0.005), a max-of-timepoints measure biased upward without a blank. ANOVA: 'no significant effect of stimulus' (all p > 0.05). |
| Lutnik M, Weisshaar S, Mussbacher LM, Steiner D, Wolzt M 2024 · Scientific reports | RCT | contradicts | moderate | Randomized crossover trial in 17 healthy humans comparing 30g glucose vs 30g ENSO 16 (a 16-sweetener blend); insulin and C-peptide AUC(0-180min) were significantly greater after glucose than after the sweetener blend, with only a small rise |
| Gibbons C, Beaulieu K, Almiron-Roig E, Navas-Carretero S, Martínez JA, O'Hara B, O'Connor D, Nazare JA, Le Bail A, Rannou C, Hardman C, Wilton M, Kjølbæk L, Scott C, Moshoyiannis H, Raben A, Harrold JA, Halford JCG, Finlayson G 2024 · EBioMedicine | RCT | contradicts | high | Randomized crossover trial (n=53 overweight/obese adults, SWEET consortium) comparing biscuits sweetened with sucrose vs neotame vs Stevia Rebaudioside M; postprandial insulin (2-h iAUC) was significantly LOWER after neotame and StRebM than |
| Boxall LR, Eskandari F, Wallis J, Bielat AD, Appleton KM 2025 · Adv Nutr | meta-analysis | contradicts | moderate | Aspartame showed little to no effect on glucose/insulin acutely or long term across 100 experiments (certainty very low but consistently null). |
| Dhillon J, Lee JY, Mattes RD 2017 · Physiology & behavior | RCT | mixed | moderate | Sham-feeding RCT in 64 overweight/obese adults comparing sucrose vs sucralose in solid/beverage form; a subset of participants ('responders') showed a significant rise in serum insulin 2 minutes after oral exposure to sucralose, especially |
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