● Food Intelligence · Vegetable

Bell Pepper Glycemic Index and Calculate Your Own Glucose Response

Across 41,565 bell pepper logs from 9,513 members, the average glucose peak was +28.8 mg/dL — but raw bell peppers are nearly carb-free and glucose-flat on their own. The carb-pair slot tells the real story: alone they sit at +27.5 mg/dL, while a stir-fry rice base pushes them to +37.2 mg/dL (+10 mg/dL) and a sandwich build hits +38.8 mg/dL (+11 mg/dL).

GS
Reviewed by Grace Shryack
Signos Proprietary Data·Updated May 02, 2026·10 min read

● Powered by Signos cohort dataHigh confidence · n=41,565
The swap calculator below draws on 41,565 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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Ingredients — Tap to Swap
Meal Context
Pre-meal sequence
Activity after meal
Time of day
38
of 100
Signos Glucose Score
Moderate Spike Risk
75% of members fall between +23 and +33 mg/dL
Predicted Curve · 3-hr window
1401001201401601800m30m60m90m120m150m180m+28
Peak
+28
mg/dL
Time in Range
100%
3hr window
Above 140
0m
danger zone
Swaps
0
applied
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● Key Findings · Do bell peppers spike blood sugar?

No — not on their own. Bell peppers have a glycemic index of 15 and a glycemic load of 1, and 38.6% of cohort logs registered a low spike (under 20 mg/dL). The +28.8 mg/dL average is almost entirely a story of what's eaten alongside the peppers. Across 41,565 bell pepper logs from 9,513 members, the average glucose peak was +28.8 mg/dL — but the peppers themselves are crunchy, fiber-rich, and nearly carb-free. The carb-pair breakdown makes this clear: pepper alone holds at +27.5 mg/dL, while stir-fry with rice or noodles pushes it to +37.2 mg/dL (+10 mg/dL, n=3,083) and a sandwich build hits +38.8 mg/dL (+11 mg/dL, n=324). At the meal level, total carb load is the dominant driver — meals with ≥60g carbs ran 51% above the low-carb baseline (n=5,278, p<0.001). Bell peppers behave like a glucose carrier: whatever you put them with shapes the response.

  • ▸Pepper alone averages just +27.5 mg/dL across 29,372 logs — within noise of the GI=15 published reference. The peppers themselves are essentially glucose-flat.
  • ▸Stir-fry pairings drive the largest spike: pepper-in-stir-fry (rice or noodle base) averaged +37.2 mg/dL — +10 mg/dL above pepper alone (n=3,083, high confidence).
  • ▸Salads are the lowest-impact build: pepper-on-salad logs averaged +28.7 mg/dL — only +1 mg/dL over the alone baseline across 4,206 matched logs.
  • ▸Total meal carbs dominate every other modifier: meals with ≥60g carbs spiked 51% higher than the low-carb baseline (+4 mg/dL absolute, n=5,278 vs n=28,822, p<0.001).
● Signos Rules

Three citable insights from this recipe's data

Rule 1
"The Carrier Effect"
+10 mg/dL stir-fry vs alone
Bell peppers are glucose-flat on their own — pepper alone holds the cohort at +27.5 mg/dL. Drop them into a stir-fry with a rice or noodle base and the meal averages +37.2 mg/dL (n=3,083, high confidence). The peppers don't change; the rice does. Sandwiches are even worse at +38.8 mg/dL (+11 mg/dL, n=324). When peppers spike, the carrier is doing the work.
Rule 2
"The Salad Floor"
+1 mg/dL vs alone
Pepper-on-salad logs averaged +28.7 mg/dL — only +1 mg/dL above the alone baseline of +27.5 mg/dL across 4,206 matched logs. Salads are the lowest-impact way to eat bell peppers in volume because the leafy greens and dressings rarely contribute more than a few grams of fast-digest carbs. Hummus dipping is close behind at +30.3 mg/dL (+3 mg/dL, n=4,920).
Rule 3
"The Morning Edge"
−12% peak
Bell pepper meals logged before 10 am averaged 12% lower glucose peaks than the rest of the day (n=7,650 morning vs n=28,100 non-morning, p<0.001, CI: −4.09 to −3.20 mg/dL). Breakfast pepper logs averaged +26.2 mg/dL — the lowest of any meal-time slot — compared to +30.2 mg/dL for dinner. Earlier insulin sensitivity likely drives the gap, though the effect is observational.
● Curious about your own?

Curious how your body responds to bell peppers specifically?

Across 41,565 logged bell pepper meals, the average glucose peak was +28.8 mg/dL — but the IQR spans 23 mg/dL (p25: +15, p75: +38), meaning individual responses vary enormously. Your own result depends on the carrier, the carb load, and your metabolic state. A CGM tells you which side of that range you actually land on.

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Why this meal spikes

This meal stacks 3 independent spike drivers — together they account for +27 mg/dL.

Driver 1
Meal-level carbohydrates (≥60g when paired)
+13 mg/dL
The dominant lever: meals with ≥60g carbs ran 51% higher than low-carb logs (p<0.001, n=5,278 vs n=28,822). Bell peppers themselves are nearly zero net carbs, so this effect is entirely from what they're eaten with.
Driver 2
Carrier choice (stir-fry rice, sandwich bread, fajita tortilla)
+10 mg/dL
The carb-pair slot directly captures the carrier penalty: stir-fry adds +10 mg/dL, sandwich +11 mg/dL, fajita/tortilla +7 mg/dL — all relative to pepper alone.
Driver 3
Individual glucose variability (IQR 23 mg/dL)
+7 mg/dL
The interquartile range spans 23 mg/dL (p25: +15, p75: +38 mg/dL), meaning personal metabolic state — insulin sensitivity, microbiome, stress — accounts for a substantial portion of any given reading.
● Which bucket are you in?

Some members spike +25.7 mg/dL. Others spike +41.5. 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 bell peppers is how hard the cohort number works to make them look ordinary. The headline +28.8 mg/dL across 41,565 logs reads like a moderate spike — but the slot breakdown tells a different story. Pepper alone holds at +27.5 mg/dL, salads add just +1 mg/dL, and hummus dipping adds only +3 mg/dL. The peppers themselves are doing nothing. It's the stir-fry rice (+10 mg/dL), the fajita tortilla (+7 mg/dL), and the sandwich bread (+11 mg/dL) that turn pepper meals into carb meals. Bell peppers are a near-perfect example of why the carrier matters more than the vegetable.
— Signos Data Science Team

Why this happens, physiologically

Bell peppers are a near-zero-glycemic-impact vegetable — published GI=15, GL=1 — with roughly 6g of total carbs in a 150g serving, most of it fiber and water. The cohort mean of +28.8 mg/dL across 41,565 logs is therefore almost entirely a function of meal context, not pepper biology. The single biggest lever measured is total meal carb load: meals with ≥60g carbs ran 51% higher than the low-carb baseline (p<0.001, n=5,278), and the carb-bucket analysis shows a near-linear escalation from +25.7 mg/dL in light (0–40g carb) meals to +41.5 mg/dL in very-heavy (110g+) meals — a 62% jump. Two pairings pull in the opposite direction: high fat (≥15g) trimmed the response by ~7% and high protein (≥15g) by ~4%, both highly significant. The mechanism is observational, not yet causal, but the pattern is consistent with fat and protein slowing gastric emptying and blunting any co-ingested carb spike.

● Three mechanisms explain bell pepper's glucose range

Meal carb load, the carrier choice, and protein/fat co-ingestion each drive measurable shifts in bell pepper's glucose response

  1. Mechanism 1
    +51%
    High carb co-load
    Meals logged with ≥60g total carbs showed peaks 51% above the low-carb baseline (n=5,278, p<0.001). Bell peppers contribute almost no fast-digest carbs — every point of that 51% comes from what they're eaten with.
  2. Mechanism 2
    +10 mg/dL
    Stir-fry carrier
    The single highest-impact carrier in the slot data: pepper-in-stir-fry (rice or noodle base) averaged +37.2 mg/dL vs. +27.5 mg/dL alone (n=3,083, high confidence). Sandwiches were close behind at +11 mg/dL above baseline.
  3. Mechanism 3
    −7%
    Fat-slowed emptying
    High-fat pairings (≥15g) reduced the response by ~7% across 28,099 matched logs (CI: −2.89 to −1.33 mg/dL, p<0.001). High protein pairings (≥15g) added another 4% reduction across 33,585 logs.
● Fit Check
Bell peppers are a low-GI, glucose-flat vegetable — until the carrier on the plate around them turns the meal into something else.
✓ This is for you if
  • ▸You eat bell peppers raw or sliced as a snack. Pepper-alone logs averaged just +27.5 mg/dL across 29,372 matched meals.
  • ▸You build salads with peppers as a volume base. Pepper-on-salad logs averaged +28.7 mg/dL — only +1 mg/dL over the alone baseline.
  • ▸You dip raw peppers in hummus instead of crackers or chips. Hummus pairings averaged +30.3 mg/dL — well below the +37.2 mg/dL stir-fry carrier.
  • ▸You log peppers at breakfast. Breakfast pepper meals averaged +26.2 mg/dL — the lowest meal-time slot, ~12% below the all-day average.
✗ Not for you if
  • ▸You build stir-fries with rice or noodle bases. That pairing averaged +37.2 mg/dL — +10 mg/dL above pepper alone across 3,083 matched logs.
  • ▸You stack peppers on sandwiches or subs. Sandwich builds averaged +38.8 mg/dL — the highest pairing peak we measured (+11 mg/dL, n=324, medium confidence).
  • ▸You wrap fajitas in flour tortillas. Fajita/tortilla/wrap meals hit +34.4 mg/dL — +7 mg/dL above alone across 1,827 matched logs.
  • ▸You roast peppers and serve them with pasta or grain bowls. Roasted peppers averaged +32.2 mg/dL — +5 mg/dL above the raw default — likely reflecting what they're typically served with.
● How it fits your day

Calorie band and pairings (member-measured)

Per serving
30–490 kcal
Ranges from a 150g raw pepper snack (~30 kcal) to a full pepper-and-rice stir-fry (~490 kcal); single-item logs averaged 239 kcal.
● Pair before
  • ▸Pair peppers with hummus or a salad rather than a stir-fry rice base: salad logs averaged +28.7 mg/dL vs +37.2 mg/dL for stir-fry — a 30% difference driven by the carrier.
  • ▸Keep total meal carbs under 40g: light-carb pepper meals averaged +25.7 mg/dL vs +41.5 mg/dL in the 110g+ carb bucket — a 62% escalation.
● Pair after
  • ▸Time a 15–20 min walk after high-carrier pepper meals (e.g. fajitas, stir-fries, sandwiches), which averaged +34–39 mg/dL — the highest pairings in the cohort.
  • ▸If dinner is the pepper meal, note that dinner logs averaged +30.2 mg/dL vs breakfast at +26.2 mg/dL — favor morning timing for the highest-carb pepper builds when possible.
● Avoid pairing
  • ▸Avoid sandwich or sub builds with peppers: that pairing added +11 mg/dL over the alone baseline (treatment mean +38.8 mg/dL, n=324, medium confidence).
  • ▸Avoid stacking peppers in stir-fries with rice or noodle bases when carb-managing — that combination added +10 mg/dL above pepper alone across 3,083 logs.
● 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 bell pepper's glucose response compares to other low-GI vegetables and pairings
Cucumber Glycemic Index & Glucose Score
Cucumber sits in the same crunchy-and-glucose-flat tier as bell pepper — another vegetable where the carrier, not the food, drives the cohort response.
Tomato Glycemic Index & Glucose Score
Tomato is a near-twin to bell pepper on the GI scale — both are low-load vegetables that ride along with whatever's on the plate.
Broccoli Glycemic Index & Glucose Score
Broccoli is the other classic glucose-flat vegetable — like bell pepper, the cohort spike depends almost entirely on the carrier (rice, pasta, dressing).
White Rice Glycemic Index & Glucose Score
White rice is the carrier doing most of the work in pepper stir-fry meals — see how much it contributes on its own.
Track Your Bell Pepper Response with Signos →
See how your glucose reacts to bell peppers raw on a salad vs. in a fajita or stir-fry — CGM data, personalized to you.

Frequently Asked Questions

Methodology

This page draws on 41,565 bell pepper logs from 9,513 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. We report mean glucose peak across a right-skewed distribution — the median single-item spike of +25 mg/dL is a few mg/dL lower than the mean of +28.8 mg/dL, which is typical for this type of data. Bell peppers were identified using a regex matching "bell pepper" plus colored-pepper variants (red/green/yellow/orange), excluding spicy peppers (jalapeño, habanero, serrano), pepper jellies/sauces, black/white pepper spice, and pepperoni. Any carb-pair 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 cup sliced bell pepper" may vary in actual weight, affecting per-serving spike accuracy.
  • Cohort skews health-motivated; Signos members actively tracking glucose tend to eat more mindfully than the general population, so real-world average spikes may differ.
  • The sautéed / stir-fried strips form sub-cohort is small (n=68) and carries low confidence — its reported delta of −1.5 mg/dL vs. raw should be treated as directional only, not statistically firm.
  • The stuffed peppers form (rice / meat-filled) was suppressed from the recipe builder due to insufficient sample size (n=2 in the slot match, n=8 in the broader cohort); we cannot make a reliable claim about that preparation here.
  • The sandwich / sub carb-pair sub-cohort has medium confidence (n=324); treat its +11 mg/dL delta as a directional estimate pending a larger sample.
  • 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 bell pepper response

Across 41,565 logged bell pepper meals, the average glucose peak was +28.8 mg/dL — but the IQR spans 23 mg/dL, meaning your personal response could land well above or below that. What you pair the peppers with matters too: a stir-fry adds +10 mg/dL, a sandwich adds +11 mg/dL, while a salad adds just +1 mg/dL. A CGM shows you exactly where you land and which builds work best for your biology.

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