● Food Intelligence · Snack
Across 806 single-item shortbread logs, Signos members averaged a +34.8 mg/dL glucose peak — with 55.1% of responses topping +30 mg/dL. Load ≥20g of sugar into the build and the peak climbs ~35% higher; keep total meal carbs in the light range (0–40g) and the average holds at +34.7 mg/dL.
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Yes — across 806 logged meals where members ate shortbread alone, the average glucose peak was +34.8 mg/dL, with 55.1% of responses exceeding the +30 mg/dL threshold. In our single-item cohort of 806 shortbread logs, the median peak was +33.0 mg/dL and the IQR spans 27 mg/dL (p25: +19, p75: +46). Three levers define the outcome: sugar load (high-sugar builds ≥20g drove peaks 34.9% higher, p<0.001, n=329), total carb escalation (very heavy meals at 110g+ carbs averaged +49.1 mg/dL — 41.5% above the lightest bucket), and whether starting glucose is elevated (high-baseline logs showed a 16.4% lower peak, p<0.001, n=623). The butter-fat content typical of traditional shortbread is the likely reason the base peak is modest relative to other flour-based snacks — fat slows gastric emptying. These are observational, not causal findings.
Some members spike +34.7 mg/dL. Others spike +49.1. The only way to know how you'll spike is to measure with a Signos CGM.
Shortbread is a flour-butter-sugar trifecta — roughly 60% flour, 33% butter, and little else. Across 806 logged meals where members ate shortbread alone, the average glucose peak hit +34.8 mg/dL. The butter fat is the key moderating factor: fat delays gastric emptying, spreading carbohydrate absorption over a longer window and suppressing the acute glucose spike relative to lower-fat biscuits. The two biggest amplifiers measured in the cohort are sugar load (high-sugar builds ≥20g spiked 34.9% higher, p<0.001, n=329) and total meal carb load (meals at 40–70g carbs averaged +43.9 mg/dL, up 26% from the light floor). High baseline glucose (≥110 mg/dL, n=623) was associated with a 16.4% lower peak — the highest-confidence modifier in the dataset. These effects are observational, not established as causal.
This page draws on Signos production CGM data logged between March 2025 and April 2026, covering 2,020 meals containing shortbread across 949 unique members (broader cohort), with a single-item sub-cohort of 806 meals (478 unique members) where shortbread was logged without other foods. Statistical comparisons use Welch's t-test on matched pairs; modifier effects cited carry p<0.001 unless noted (high-fiber at p=0.357 and protein pairing at p=0.439 did not reach significance and are excluded from actionable claims). Cohort filtering restricts to meals with a measured glucose rise between 0 and 100 mg/dL (ppgr_case='regular'). We report mean peak glucose rise; the single-item distribution is right-skewed — the median (+33.0 mg/dL) is lower than the mean (+34.8 mg/dL). Shortbread logs were identified via regex matching on logged food names. The minimum sub-cohort threshold for calculator slots is 30 matched meals; slots below this threshold are excluded. Walkers Shortbread and homemade shortbread sub-cohorts had zero matched logs and do not appear in the builder.