How high-glycemic foods create blood sugar instability and subsequent hunger.
What the evidence says
- Compared with the low-GI meal, the high-GI meal resulted in ”lower postabsorptive plasma glucose”. Hypoglycemic levels and ~4 hours later are in no held text of `cgl07` except its quarantined restatement; the four-hour glucose figure below comes from a separate fMRI study (corrected 2026-09-19)[1]
- The high-GI meal was also followed by ”elevation in plasma epinephrine” and by higher voluntary intake. The abstract reports no hunger ratings and does not call the epinephrine counter-regulatory or tie it to hypoglycemia (corrected 2026-09-19)[1]
- In a randomized crossover fMRI trial, a high-GI meal produced lower blood glucose (4.7 vs 5.3 mmol/L) and greater hunger ~4 hours later, and heightened activity in the right nucleus accumbens — a reward/craving region — providing a brain-level link between the glucose crash and craving[2]
- In twelve obese teenage boys, voluntary energy intake in the 5 hours after lunch was 53% greater after the high-GI meal than after the medium-GI meal, and 81% greater than after the low-GI meal (sample and window restored 2026-09-19)[1]
- High-glycemic carbohydrates produce postprandial hyperinsulinemia, promoting fat storage over oxidation[3],[1]
- High-glycemic meals limit availability of metabolic fuels in the late postprandial period — insulin higher, glucagon lower, free fatty acids suppressed — reducing fat oxidation and increasing hunger[3],[1]
- *Half of obese/overweight men without diabetes dropped to blood glucose below 70 mg/dL after a 75 g oral glucose load — a standardised clinical challenge, not a meal — often with no hypoglycaemic symptoms. The paper’s word is half, twice: ”half of them exhibit glucose levels less than 70 mg/dL after a 75-g oral glucose load without notable hypoglycemic symptoms”*[4]
- In people with these dips the median snacking frequency was 6 times higher (0.9 vs 0.15 times/day, p < 0.001) — the ratio is the paper's own, not computed here (corrected 2026-09-10: median restored; the bullet read "snack 6 times more frequently")[4]
- `cif03`’s proposal, hedged in its own words: sugary snacks or drinks ”could further induce SRH”, so ”a vicious cycle … can be formed” (corrected 2026-09-10 from ”Creates vicious cycle: high-GI food → spike → insulin surge → crash → hunger → more snacking”, stated flat; high-GI is not `cif03`’s term)[4]