● Food Intelligence · Nuts & Seeds

Macadamia Glycemic Index and Calculate Your Own Glucose Response

Macadamia is the purest fat-vehicle nut in the dataset — published GI=0/GL=0, roughly 75% fat, with negligible digestible carbohydrate. Across 12,317 macadamia logs from 2,550 Signos members the cohort averaged +22.8 mg/dL, but that signal reflects unlogged sides: in matched recipe-builder logs, plain raw or roasted macadamia anchors at zero, and the curve only moves once cookies (+14 mg/dL), chocolate (+6 mg/dL), or other dessert pairings enter the meal.

GS
Reviewed by Grace Shryack
Signos Proprietary Data·Updated May 02, 2026·9 min read

● Powered by Signos cohort dataHigh confidence · n=12,317
The swap calculator below draws on 12,317 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
Swaps
0
applied
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● Key Findings · Does macadamia spike blood sugar?

No — macadamia is GI=0/GL=0, near-zero carbs and ~75% fat. The +22.8 mg/dL cohort average reflects unlogged sides, mostly cookies and chocolate. Across 12,317 macadamia logs from 2,550 Signos members, the average peak was +22.8 mg/dL — but that signal is essentially a pairings story. Published macadamia is GI=0/GL=0, so the recipe builder anchors plain raw or roasted nuts at 0; 55.8% of cohort logs registered in the low-spike bucket (under 20 mg/dL). The curve only moves when sweet companions enter the meal: macadamia in cookies pushed the peak to +35.2 mg/dL (+14 mg/dL delta, n=412), and macadamia with chocolate to +27.4 mg/dL (+6 mg/dL, n=1,995). Members often log "macadamia" while actually eating a white-chocolate-macadamia cookie — the cohort mean reflects that, the published GI does not.

  • ▸Macadamia in cookies adds the largest pairing penalty: +14 mg/dL over the no-carb baseline (treatment mean +35.2 mg/dL, n=412 matched logs, medium confidence).
  • ▸Chocolate is the most common dessert pairing and lifts the peak by +6 mg/dL: macadamia with chocolate averaged +27.4 mg/dL across 1,995 logs (high confidence).
  • ▸Total carb load dominates everything else: meals with ≥60g carbs ran 68% above the low-carb baseline (+35 vs +21 mg/dL), and meals with ≥20g sugar ran 76% above baseline — the biggest modifier in the dataset (n=1,183, p<0.001).
  • ▸Plain macadamia anchors at zero: across 1,989 single-item logs the median peak was +17 mg/dL, and the cohort was zeroed in the recipe builder because published GI/GL is 0.
● Signos Rules

Three citable insights from this recipe's data

Rule 1
"The Zero-Carb Anchor"
GI 0 / GL 0
Macadamia is the purest fat-vehicle nut measured: roughly 75% fat per ounce, negligible digestible carbohydrate, and a published GI of 0. In the recipe builder, both raw/roasted and salted forms anchor at +0 mg/dL because the cohort mean reflects unlogged sides — not the nut itself. When members logged macadamia as a true single item (n=1,989), 58.2% landed in the low-spike bucket and the median peak was +17 mg/dL.
Rule 2
"The Fat-Vehicle Pattern"
−24% with high-fat meals
When macadamia appeared in meals with ≥15g of fat (the bulk of the cohort, n=10,791), peaks ran 24% lower than fat-light meals (CI: −10.6 to −3.2 mg/dL, p<0.001). This is consistent with macadamia's role as a fat-buffering side — its own ~22g of fat per ounce slows gastric emptying and blunts the response from any co-ingested carbs. Pairing macadamia with protein (≥15g) and morning timing showed near-zero additional effect, reinforcing that fat is doing the buffering work.
Rule 3
"The Dessert-Context Amplifier"
+14 mg/dL in cookies
Every meaningful spike attached to "macadamia" in the cohort traces back to a sweet companion. Cookies — typically white-chocolate-macadamia — pushed the average peak to +35.2 mg/dL, a +14 mg/dL jump over the no-carb baseline (n=412, medium confidence). Co-ingested chocolate added +6 mg/dL (n=1,995, high confidence). Granola/trail-mix and yogurt/oatmeal pairings added only +2 to +3 mg/dL. The lesson: the macadamia is not the variable — the dessert matrix is.
● Curious about your own?

Curious how your body responds to macadamia specifically?

Across 12,317 logged meals containing macadamia, the average glucose peak was +22.8 mg/dL — but the IQR spans 22 mg/dL (p25: +9, p75: +31). With published GI=0, your individual response is essentially a function of what you ate alongside the nuts. A CGM tells you which side of that range you actually land on.

Learn how Signos works
Why this meal spikes

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

Driver 1
Sweet companions (cookies, chocolate, glazed coatings)
+14 mg/dL
The dominant lever in matched-pair logs: cookies added +14 mg/dL and chocolate added +6 mg/dL versus the no-carb baseline. Macadamia's own carb contribution is essentially zero, so every point of the spike traces to the sugar matrix it's eaten with.
Driver 2
Total meal carb load (≥60g)
+14 mg/dL
Meals with ≥60g carbs ran 68% above the low-carb baseline (+35 vs +21 mg/dL, n=830, p<0.001). The carb-bucket gradient is steep: light (0–40g) meals averaged +20.7 mg/dL, very heavy (110g+) meals averaged +34.9 mg/dL — a 69% escalation.
Driver 3
Individual variability (IQR 22 mg/dL)
+6 mg/dL
Even at GI=0, individual responses span +9 to +31 mg/dL between the 25th and 75th percentiles. Personal metabolic state — insulin sensitivity, sleep, prior meal — accounts for substantial spread independent of what's on the plate.
● Which bucket are you in?

Some members spike +0 mg/dL. Others spike +35.2. 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 macadamia is how completely the cohort mean reflects everything except the macadamia. Published GI is 0, GL is 0, and a 1-oz serving is essentially fat with a trace of carb. Yet members averaged +22.8 mg/dL across 12,317 logs — because "macadamia" in real-world tracking is often a white-chocolate-macadamia cookie, a chocolate bar with nuts, or a handful pulled from granola. When we anchor the recipe builder at 0 and let the carb-pair slot do the work, the data finally tells the right story: cookies +14, chocolate +6, dessert +3 — the curve moves with the sugar, not the nut.
— Signos Data Science Team

Why this happens, physiologically

Macadamia is the lowest-carb, highest-fat nut in the dataset — roughly 75% of its calories come from monounsaturated fat, with under 2g of net carbs per ounce. Published glycemic index is 0 and glycemic load is 0, which is why the recipe builder anchors raw, roasted, and salted forms at +0 mg/dL: the +22.8 mg/dL cohort average across 12,317 logs reflects unlogged sides, not metabolic activity from the nut itself. The dominant levers in the modifier table all live in the meal context, not the nut. Meals carrying ≥20g sugar ran 76% above baseline (n=1,183, p<0.001) and meals carrying ≥60g carbs ran 68% above (n=830). Conversely, the high-fat sub-cohort — which captures most macadamia logs — ran 24% lower than fat-light meals, consistent with macadamia's role as a gastric-emptying buffer. The mechanism is observational, not yet causal, but the pattern is clean: macadamia is a near-pure fat vehicle, and the only way its glucose curve moves is when sugar shows up alongside it.

● Three mechanisms explain macadamia's glucose range

Near-zero digestible carbs, fat-driven gastric slowing, and dessert-context sugars each shape the response

  1. Mechanism 1
    GI 0
    Near-zero digestible carbs
    Macadamia contains essentially no fast-digesting carbohydrate (~1g net carbs per ounce). Published GI/GL are both 0, so plain macadamia produces no measurable independent glucose response — the recipe builder anchors at 0 to reflect this.
  2. Mechanism 2
    −24%
    Fat-slowed emptying
    Meals with ≥15g fat — the bulk of the macadamia cohort — ran 24% below fat-light meals (CI: −10.6 to −3.2 mg/dL, n=10,791 vs n=137, p<0.001). Macadamia's ~22g of fat per oz contributes meaningfully to this gastric-emptying buffer.
  3. Mechanism 3
    +76%
    Sugar in the matrix
    When macadamia appeared in a meal carrying ≥20g sugar (cookies, chocolate, dessert), peaks ran 76% above the low-sugar baseline (n=1,183, p<0.001). The sugar is doing the work; macadamia is along for the ride.
● Fit Check
Macadamia is as close to a glucose-neutral snack as exists — until it shows up inside a cookie or coated in chocolate.
✓ This is for you if
  • ▸You snack on plain raw or roasted macadamia. Both forms anchor at 0 mg/dL and 55.8% of cohort logs landed in the low-spike bucket.
  • ▸You want a fat-forward partner for higher-carb meals. The high-fat sub-cohort (≥15g fat) ran 24% below fat-light meals — macadamia's ~22g of fat per oz contributes to that buffer.
  • ▸You're carb-limiting (keto, low-carb, or just under-40g meals). Plain macadamia adds essentially zero net carbs, and light-carb meals averaged just +20.7 mg/dL.
  • ▸You reach for salted over candied. Salted macadamia averaged +19.8 mg/dL (n=130) — within noise of the raw/roasted anchor and far below cookie or chocolate pairings.
✗ Not for you if
  • ▸You eat macadamia inside cookies. White-chocolate-macadamia and similar cookies pushed the average peak to +35.2 mg/dL — a +14 mg/dL jump over the no-carb baseline (n=412).
  • ▸You pair macadamia with chocolate as a dessert. That combination averaged +27.4 mg/dL across 1,995 logs — +6 mg/dL above plain macadamia.
  • ▸You log macadamia inside very-heavy-carb meals (110g+). The very-heavy carb bucket averaged +34.9 mg/dL — 69% above the light-carb baseline.
  • ▸You expect honey-glazed or candied macadamia to behave like raw. We dropped that variant from the recipe builder for low confidence (n=22), but the directional treatment mean was +37 mg/dL — a sugar load, not a nut.
● How it fits your day

Calorie band and pairings (member-measured)

Per serving
200–700 kcal
Plain 1-oz macadamia is ~200 kcal of mostly fat; single-item logs averaged 237 kcal, multi-item meals 637 kcal — the difference is dessert and sides, not the nut.
● Pair before
  • ▸Eat macadamia plain or salted as your default snack: both forms anchor at 0 mg/dL and the high-fat profile slows any co-ingested carbs by ~24%.
  • ▸If pairing with sweets is unavoidable, choose chocolate (+6 mg/dL) over cookies (+14 mg/dL) — the cookie matrix is the larger glucose driver.
● Pair after
  • ▸After cookie or dessert pairings, time a 15–20 min walk: those meals averaged +27 to +35 mg/dL versus the +21 mg/dL plain baseline.
  • ▸Use plain macadamia as a buffer alongside higher-carb meals — the fat content is associated with a 24% lower peak in matched logs.
● Avoid pairing
  • ▸Avoid chocolate-covered or honey-glazed macadamia for glucose specifically — the candied form's directional mean was +37 mg/dL versus +21.6 mg/dL plain (we dropped both from the builder for low confidence: n=0 and n=22).
  • ▸Avoid stacking macadamia inside very-heavy-carb meals (110g+); that bucket averaged +34.9 mg/dL — 69% above the light-carb baseline.
● 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 macadamia compares to other nuts and zero-carb fat-vehicle foods
Almonds Glycemic Index & Glucose Score
Almonds averaged +26.6 mg/dL across 80,948 logs — modestly higher than macadamia's +22.8 mg/dL, with similar pairing dynamics.
Walnuts Glycemic Index & Glucose Score
Walnuts share macadamia's fat-vehicle pattern — see how omega-3-rich walnuts compare in single-item and paired logs.
Pecans Glycemic Index & Glucose Score
Pecans are macadamia's closest fat-profile cousin — both run high-fat, low-carb, and anchor near zero in plain form.
Pistachios Glycemic Index & Glucose Score
Pistachios carry slightly more carb than macadamia — see how that shifts the curve in matched logs.
Butter Glycemic Index & Glucose Score
Butter is the other zero-GI fat-vehicle in the atlas — same anchor-at-zero treatment as macadamia, same pairings story.
Track Your Macadamia Response with Signos →
See how your glucose reacts to plain macadamia vs. white-chocolate-macadamia cookies — CGM data, personalized to you.

Frequently Asked Questions

Methodology

This page draws on 12,317 macadamia-tagged meal logs from 2,550 unique Signos members, plus a 1,989-log single-item sub-cohort, collected through the Signos production CGM platform between Mar 2025 and Apr 2026. 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; reported effects carry p<0.001 unless noted. Because macadamia's published GI and GL are both 0, the form-slot anchors in the recipe builder are overridden to +0 mg/dL — full cohort means (raw/roasted +21.6 mg/dL; salted +20.8 mg/dL) reflect unlogged sides like cookies and chocolate and are preserved in `option_mean_full_cohort` for transparency. Modifier and carb-pair deltas continue to use full cohort statistics. The food was identified using a regex matching "macadamia" as a primary ingredient, excluding macadamia oil, butter, and milk. Carb-pair slots require at least 30 matched meals before they appear in the recipe builder.

Limitations

  • Macadamia's published GI=0/GL=0 means form-slot anchors are zeroed at the page level. The cohort default-form mean of +21.6 mg/dL (n=9,062) is preserved in the underlying JSON but reflects unlogged sides — interpret the visible "alone = 0" anchor as the editorial truth, not a contradiction.
  • Self-reported portion sizes introduce measurement error — a logged "1 oz" of macadamia may vary in actual weight, affecting per-serving estimates.
  • Cohort skews health-motivated; Signos members tracking glucose tend to eat more mindfully than the general population, so real-world pairing distributions may differ.
  • The ice cream / dessert carb-pair sub-cohort is small (n=83) and carries low confidence — its +3 mg/dL delta should be treated as directional only.
  • Chocolate-covered macadamia (n=0) and honey-glazed/candied macadamia (n=22) were suppressed from the recipe builder for low confidence; treat any candied-variant glucose claim with caution.
  • Modifier analyses reflect meal-level correlations, not controlled feeding trials — causality cannot be established from observational CGM data alone.
● Get your own data

See your own macadamia response

Macadamia is GI=0 and anchors at 0 in our recipe builder — the spread you see in the cohort comes almost entirely from the cookies, chocolate, and dessert pairings members ate alongside the nuts. A CGM shows you exactly where you land, and which builds — plain handful, salted snack, or white-chocolate-macadamia cookie — actually move your curve.

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