● Food Intelligence · Condiment

Mayonnaise Glycemic Index and Calculate Your Own Glucose Response

Across 32,949 logged mayonnaise meals, members averaged +29.0 mg/dL — but mayonnaise itself has a glycemic index of 0. That cohort signal is the sandwich bread, the burger bun, and the fries in the dip: fry-dipping ran +17 mg/dL above the no-pairing baseline, burgers +9, sandwiches +5. Mayo is an egg-and-oil emulsion with almost no carbohydrate — the curve under the spread is whatever it sits on top of.

GS
Reviewed by Grace Shryack
Signos Proprietary Data·Updated May 20, 2026·10 min read

● Powered by Signos cohort dataHigh confidence · n=32,949
The swap calculator below draws on 32,949 matched-pair logs — a broader cohort than the page's single-item primary, used to give every ingredient swap statistical power. Welch's t-test on matched pairs, not third-party glycemic-index tables. Each swap shows its sample size and confidence tier inline.
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Meal Context
Pre-meal sequence
Activity after meal
Time of day
11
of 100
Signos Glucose Score
Low Spike Risk
75% of members fall between +7 and +9 mg/dL
Predicted Curve · 3-hr window
1401001201401601800m30m60m90m120m150m180m+8
Peak
+8
mg/dL
Time in Range
100%
3hr window
Above 140
0m
danger zone
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0
applied
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● Key Findings · Does mayonnaise spike blood sugar?

No — mayonnaise alone is glycemically inert (GI=0, zero carbs). The +29.0 mg/dL cohort average across 32,949 logs is driven entirely by the carb underneath or around the mayo. Mayonnaise is an egg-and-oil emulsion with essentially no carbohydrate, which is why every form anchor in our recipe builder — regular, light, olive-oil, vegan, chipotle, garlic aioli — is set to 0 mg/dL. The cohort mean of +29.0 mg/dL exists because members log mayo alongside sandwiches, burgers, fries, and tuna-salad crackers. The pairing table makes the structure visible: fry-dipping averaged +45.4 mg/dL (+17 mg/dL delta, n=905), burgers +37.6 mg/dL (+9, n=2,261), sandwiches +33.4 mg/dL (+5, n=1,520), tuna/chicken/egg salad +30.3 mg/dL (+2, n=175), and coleslaw came in slightly below baseline at +27.6 mg/dL (−1, n=475). The mayo isn't keto-incompatible — but the sandwich, bun, or fries underneath usually are.

  • ▸Fry-dipping drove the highest spikes: +45.4 mg/dL average, a +17 mg/dL delta over plain mayo across 905 matched logs (high confidence).
  • ▸Burgers added +9 mg/dL: mayo-on-burger meals averaged +37.6 mg/dL vs. +28.2 mg/dL baseline (n=2,261 vs n=29,196).
  • ▸Sandwiches, subs, and wraps ran +5 mg/dL: +33.4 mg/dL average across 1,520 matched logs — large-volume bread-driven pairing.
  • ▸Coleslaw came in below baseline at +27.6 mg/dL — a −1 mg/dL delta across 475 logs, the only mayo pairing in the table that ran lower than plain.
● Signos Rules

Three citable insights from this recipe's data

Rule 1
"The Spread-Vehicle Effect"
+17 mg/dL with fries
Mayo has no glycemic signal of its own — published GI is 0 and the recipe-builder anchor is 0. The entire +29.0 mg/dL cohort mean reflects what mayo accompanied. Fry-dipping averaged +45.4 mg/dL (n=905) — a +17 mg/dL delta over plain mayo. Burgers (+9), sandwiches (+5), and tuna/chicken/egg salad (+2) all show the same structure: every degree of spike comes from the bread, bun, or fried potato, not the spread.
Rule 2
"Form Doesn't Matter"
0 mg/dL across all six forms
Regular, light, olive-oil/avocado-oil, vegan, chipotle, and garlic aioli — none of them contain meaningful carbs, so all six form anchors sit at 0 mg/dL in the recipe builder. Cohort means (olive-oil mayo +25.3, garlic aioli +27.6, regular +28.6, chipotle +29.0, vegan +30.5, light +30.2) reflect what members ate alongside each form, not the mayo itself. Olive-oil mayo trends lowest because it skews toward salad and lower-carb builds.
Rule 3
"The Coleslaw Anomaly"
−1 mg/dL in slaw
Mayo-in-coleslaw averaged +27.6 mg/dL across 475 logs — slightly below the +28.2 mg/dL plain-mayo baseline. The cabbage and vinegar base carries almost no glycemic load, so the meal reads close to mayo's true zero-carb anchor. It's the cleanest demonstration in the table that when the underlying base is genuinely low-carb, mayo's presence is glycemically invisible.
● Curious about your own?

Curious how your body responds to mayonnaise specifically?

Mayo has a glycemic index of 0 — but the sandwich underneath isn't 0. Across 32,949 logged meals, the average peak landed at +29.0 mg/dL, with mayo-with-fries hitting +45.4 and mayo-in-coleslaw at +27.6. Your own response depends entirely on what's underneath. A CGM tells you which builds work for your biology.

Learn how Signos works
Why this meal spikes

This meal stacks 3 independent spike drivers — together they account for +0 mg/dL.

Driver 1
The carb underneath (bread, bun, fries)
+17 mg/dL
The dominant — really, the only — driver. Fry-dipping ran +17 mg/dL above plain mayo (n=905); burgers +9 (n=2,261); sandwiches +5 (n=1,520). Mayo contributes zero carbs to any of these meals.
Driver 2
Total meal carb load (≥60g) when mayo is present
+18 mg/dL
Meals tagged with mayonnaise and ≥60g total carbs ran 72% higher than the lower-carb baseline (CI: +17.51 to +18.99 mg/dL, n=3,488 vs n=24,229, p<0.001). Same effect, expressed at meal level: the carbs are doing the work.
Driver 3
Sugar load (≥20g) in the surrounding meal
+14 mg/dL
High-sugar pairings (≥20g) lifted peaks 51.1% (CI: +12.84 to +14.6 mg/dL, n=2,361 vs n=25,419). Sweet sauces, ketchup-and-mayo combos, sugary BBQ pairings — mayo is along for the ride.
● Which bucket are you in?

Some members spike +25.2 mg/dL. Others spike +47.7. The only way to know how you'll spike is to measure with a Signos CGM.

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● What surprised us
What surprised us about mayonnaise is how cleanly the spread-vehicle pattern showed up across 32,949 logs. Mayo has a glycemic index of 0 — it cannot raise blood sugar on its own — yet the cohort mean came in at +29.0 mg/dL. Every point of that signal is what the mayo sat on: fries +17, burger +9, sandwich +5. Coleslaw, which is genuinely low-carb, ran a hair below baseline (−1). Our recipe-builder form anchors are all set to 0, which means regular, olive-oil, vegan, and chipotle all read identically at the alone-anchor — exactly as the published GI predicts. Mayo isn't keto-incompatible. The sandwich underneath usually is.
— Signos Data Science Team

Why this happens, physiologically

Mayonnaise contributes essentially zero glucose; the cohort mean of +29.0 mg/dL across 32,949 logs reflects the bread, bun, or fries the mayo accompanied, not the spread. The headline story is the pairing slot: fry-dipping averaged +45.4 mg/dL (+17 mg/dL delta), burgers +37.6 (+9), sandwiches +33.4 (+5), tuna/chicken/egg salad +30.3 (+2), and coleslaw +27.6 (−1, the only pairing below baseline). Plain mayonnaise — used alone, with no carb base — anchors at +28.2 mg/dL across 29,196 baseline logs, almost certainly reflecting trace co-logged items rather than the mayo itself. Fat-pairing analysis showed no meaningful buffering effect (~3.5%, p=0.54) because mayo is typically the spread on a carb, not an add-on to one.

● Three mechanisms explain mayonnaise's glucose range

Zero-carb anchor, spread-vehicle reality, and the absence of a fat-buffer signal each shape what shows up on the trace

  1. Mechanism 1
    GI = 0
    Zero-carb anchor
    Mayonnaise is essentially egg yolk and oil — there's no meaningful carbohydrate to digest. Published GI is 0, and every form anchor in our recipe builder is set to 0 mg/dL. Pure mayo cannot raise glucose on its own.
  2. Mechanism 2
    +17 mg/dL
    Spread-vehicle reality
    Members rarely eat mayo alone — they spread it on sandwiches, slather it on burgers, dip fries in it. The pairing table shows the entire glucose response in those meals comes from the carb: fry-dipping +17 mg/dL above plain-mayo baseline (n=905), burger +9 (n=2,261), sandwich +5 (n=1,520).
  3. Mechanism 3
    p=0.54
    No buffer effect
    Unlike olive oil and butter — where ≥15g fat pairings cut peaks by 8–11% — mayo's high-fat-pairing signal was not statistically significant (CI: −2.11 to +4.05 mg/dL, n=27,384). The reason is structural: mayo is the spread on a carb, not a fat add-on to one, so there's no separable fat-buffer effect to measure.
● Fit Check
Mayonnaise is a glycemically inert spread — what it sits on is the entire story.
✓ This is for you if
  • ▸You add mayo to coleslaw or low-carb salads. The mayo-in-coleslaw pairing averaged +27.6 mg/dL across 475 logs — actually slightly below the +28.2 mg/dL plain-mayo baseline.
  • ▸You make tuna, chicken, or egg salad with mayo. That pairing averaged +30.3 mg/dL across 175 logs — just +2 mg/dL above plain mayo, the second-lowest in the table.
  • ▸You reach for regular, olive-oil, or chipotle mayo. All six forms anchor at 0 mg/dL in the recipe builder — the form itself doesn't change the glucose response.
  • ▸You use mayo as a binder in low-carb builds (cabbage-bun burgers, lettuce wraps). The mayo contributes zero carbs and the cohort signal collapses without bread underneath.
✗ Not for you if
  • ▸You dip fries in mayo regularly. That pairing averaged +45.4 mg/dL — a +17 mg/dL delta, the largest in the pairing table (n=905, high confidence).
  • ▸You add mayo to burgers and cheeseburgers. Mayo-on-burger meals averaged +37.6 mg/dL, +9 mg/dL above plain mayo across 2,261 matched logs.
  • ▸You spread mayo on sandwiches, subs, or wraps. That combination ran +33.4 mg/dL on average — a +5 mg/dL delta in 1,520 logs (the bread carries the signal).
  • ▸You stack mayo into high-carb deli meals (sub + chips + cookie). Meals with ≥60g carbs ran +18 mg/dL above the low-carb baseline (n=3,488 vs n=24,229, p<0.001) — mayo is along for the ride.
● How it fits your day

Calorie band and pairings (member-measured)

Per serving
100–700 kcal
1 tbsp mayo is ~94 kcal on its own; multi-item meals containing mayo averaged 527 kcal. The very-heavy carb bucket (110g+) ran 1,335 kcal.
● Pair before
  • ▸If you want a low-spike mayo build, pair with cabbage-based slaw or a lettuce-wrap burger: mayo-in-coleslaw ran −1 mg/dL vs baseline (n=475), the only sub-baseline pairing in the table.
  • ▸Choose olive-oil or avocado-oil mayo on lower-carb meals — cohort mean trended lowest at +25.3 mg/dL (n=4,658) because it skews toward those builds.
● Pair after
  • ▸Time a 15–20 min walk after mayo-with-fries or mayo-on-burger meals — those pairings averaged +45.4 and +37.6 mg/dL respectively, the highest in the cohort.
  • ▸Note that morning mayo logs (before 10am) ran 10.9% lower than later-day meals (CI: −3.96 to −2.5 mg/dL, n=2,610) — earlier insulin sensitivity helps.
● Avoid pairing
  • ▸Avoid stacking mayo dips with fries: that pairing averaged +45.4 mg/dL, the highest carb-pair penalty (+17 mg/dL delta, n=905).
  • ▸Avoid mayo as the default sandwich spread on white bread or sub rolls: +33.4 mg/dL average across 1,520 logs (+5 mg/dL above plain mayo) — the bread carries the signal.
● Quick definitions (click to expand)
mg/dL — milligrams per deciliter. The unit blood glucose is measured in. A rise of "+30 mg/dL above baseline" means blood sugar went up 30 units after the meal.
Glycemic Index (GI) — a 0–100 score for how fast a food raises blood sugar in lab tests. Under 55 = low, 56–69 = medium, 70+ = high.
Glycemic Load (GL) — GI adjusted for portion size. Under 10 = low, 10–19 = medium, 20+ = high.
CGM — Continuous Glucose Monitor. A wearable sensor that tracks blood glucose every few minutes. Signos members wear CGMs while eating meals they log.
● Related Foods: How mayonnaise compares to other spreads and the carbs underneath in glucose response

Frequently Asked Questions

Methodology

This page draws on 32,949 mayonnaise-tagged logged meals from 7,983 unique Signos members, collected through the Signos production CGM platform. Data were filtered to postprandial glucose responses (PPGR) between 0 and 100 mg/dL to exclude sensor artifacts and implausible readings. Modifier effects were estimated using Welch's t-test on matched pairs against a defined baseline; all reported effects carry p<0.001 unless noted. Because mayonnaise has a published glycemic index of 0 and glycemic load of 0, the recipe-builder form anchors are overridden to 0 mg/dL — the underlying cohort means (preserved in `option_mean_full_cohort`) reflect the carbs members ate alongside each form, not the mayo itself. The food was identified in member logs using a regex matching mayonnaise / mayo / aioli mentions as a primary ingredient. Any pairing slot requires at least 100 matched meals before it appears in the recipe builder.

Limitations

  • Self-reported portion sizes introduce measurement error — a logged "1 tbsp" of mayo may vary substantially in actual quantity, affecting per-serving estimates.
  • Cohort skews health-motivated; Signos members actively tracking glucose tend to eat more mindfully than the general population, so real-world average pairings may differ.
  • The garlic aioli form sub-cohort has low confidence (n=73); its cohort-mean delta vs. regular mayo should be treated as directional only.
  • Cohort means appear non-zero (e.g. regular +28.6 mg/dL) because members underreport sides — "logged: mayo; ate: turkey sandwich with mayo." The published GI=0 is the editorially correct anchor, which is why our recipe builder reads alone = 0.
  • Modifier analyses reflect meal-level correlations, not controlled feeding trials — causality cannot be established from observational CGM data alone.
  • Single-item mayonnaise logs (n=82) are extremely rare — members almost always consume mayo with a carb. The recipe-builder anchor reflects this by zeroing the alone-state, since the published GI is the relevant clinical reference, not co-logging artifacts.
● Get your own data

See your own mayonnaise response

Mayo alone is glycemically inert (GI=0), but the cohort signal of +29.0 mg/dL across 32,949 logs reflects the sandwich, burger, and fries it accompanied. Mayo with fries ran +17 mg/dL over plain; on burger +9; on sandwich +5. Your personal response depends on the carb underneath — and on your insulin sensitivity, microbiome, and stress. A CGM shows you exactly where each build lands.

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