Cranberry Glycemic Index and Calculate Your Own Glucose Response

Yes — reliably. Across 11,111 cranberry-tagged logs, the mean peak was +35.8 mg/dL with 54.3% of responses exceeding the +30 mg/dL threshold. Cranberries are tart on the bush but almost always consumed sweetened. Fresh unsweetened cranberries anchor at +30.8 mg/dL across 3,350 logs — moderate territory. Dried sweetened Craisins ran +35.9 (n=2,580). The vehicle is what really moves the curve: Thanksgiving sauce +43.6 mg/dL (+12 above the no-pairing baseline, n=1,148), muffin/scone +43.5 (+12, n=1,441), juice cocktail +41.8 (+10, n=546), oatmeal/cereal/granola toppings +40.3 (+8, n=757). The lowest-spike pairings were trail mix at +30.6 (−1 mg/dL, n=393) and salad at +36.1 (+4, n=2,404), where nuts and protein buffer the sugar. Dominant modifier: ≥60g total carb meals ran 47.5% above the low-carb baseline (n=2,578, p<0.001).

• ▸Cranberry sauce and muffin pairings tied as the highest-spike contexts: +43.6 and +43.5 mg/dL — both a +12 mg/dL delta over the no-pairing baseline across 1,148 and 1,441 matched logs respectively (high confidence).
• ▸Cranberry juice cocktail averaged +41.8 mg/dL — a +10 mg/dL delta across 546 matched logs (high confidence). The sweetened red juice carries 25–30g sugar per cup.
• ▸Trail mix was the only pairing below baseline at +30.6 mg/dL (−1 mg/dL across 393 logs, medium confidence). The nut fat and protein blunt the cranberry sugar load.
• ▸Total meal carb load is the dominant lever: ≥60g carb meals ran 47.5% higher than the low-carb baseline (CI: +13.68 to +15.59 mg/dL, n=2,578, p<0.001), and high-sugar pairings (≥20g) added another 41.1% (n=4,331, p<0.001).

Three citable insights from this recipe's data

This meal stacks 3 independent spike drivers — together they account for +31 mg/dL.

Why this happens, physiologically

Cranberries carry a moderate glycemic index (GI 49, GL 10) and ~12g carb per cup of fresh berries, of which ~4g is fiber. Fresh unsweetened cranberries anchored at +30.8 mg/dL across 3,350 logs — about where the published GI predicts. The cohort mean of +35.8 mg/dL across all 11,111 logs is higher because most cranberry consumption is in sweetened vehicles. The food-pair table shows the structure: Thanksgiving sauce +12 mg/dL (n=1,148, the sauce is 30–50% added sugar), muffins and scones +12 (n=1,441), juice cocktail +10 (n=546, 25–30g sugar per cup), oatmeal toppings +8 (n=757), salad +4 (n=2,404), trail mix −1 (n=393, nuts buffer the sugar). Two meal-level levers dominate: ≥60g total carb meals run 47.5% higher than the low-carb baseline (n=2,578, p<0.001), and high sugar content ≥20g adds another 41.1% (n=4,331, p<0.001).

Calorie band and pairings (member-measured)

Frequently Asked Questions

Methodology

This page draws on 11,111 cranberry-tagged logged meals from 4,386 unique Signos members, 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. The page-primary cohort number (11,111) covers all cranberry-tagged meals; a tighter single-item cut (n=1,497, 947 members, mean +33.9 mg/dL) was used to characterize the cranberry-only signal. 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 cranberries are rarely eaten fresh and alone, the form slot is dominated by the fresh-vs-Craisins distinction; the editorial story lives in the food-pair slot, which captures Thanksgiving sauce, juice cocktail, trail mix, oatmeal/cereal toppings, muffin/scone builds, and salad contexts. The food was identified in member logs using a regex that matched 'cranberry' or 'cranberries' as a primary ingredient, with exclusions for cranberry-flavored compounds where another food is dominant. 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 'serving of Craisins' may vary substantially in actual quantity and sugar content.
• Cohort skews health-motivated; Signos members may eat cranberries in trail mix or salads at higher rates than the general population, while the Thanksgiving-sauce and juice-cocktail signals may underrepresent broader American consumption.
• Trail-mix pairing has medium confidence (n=393) and should be treated as directional. The −1 mg/dL delta vs. baseline is consistent with the nut-fat buffering mechanism but is not yet high-confidence.
• The 'pure unsweetened cranberry juice' (wellness aisle) is not separately broken out from juice cocktail; the +10 mg/dL pairing delta primarily reflects the sweetened cocktail form, which dominates volume.
• Modifier analyses reflect meal-level correlations, not controlled feeding trials — causality cannot be established from observational CGM data alone.
• Cranberry-flavored compound foods (cranberry-flavored sparkling water, cranberry liqueur) are excluded from this cohort by regex when their primary ingredient is sugar or alcohol.