Does Chewing Change How Insulin Is Released?

This article previously described an unsupported chain of physiology as an established mechanism. It was rewritten in August 2026.

There’s an explanation that goes: “chewing well releases GLP-1, which prepares the pancreas, so early-phase insulin secretion works normally.” This article used to state that without a single question mark along the way.

Here is what the cited studies actually show, one by one.

What the Three Cited Studies Actually Show

E02: A Master’s Thesis in Mice

E02 is a doctoral thesis using 190 male C57BL/6J mice. It was not published in a peer-reviewed journal.

Comparing a solid-feed group (chewing) with a liquid-feed group (no chewing, n=10 each), active GLP-1 30 minutes after intake was significantly higher in the solid-feed group (p<0.05). When the vagus nerve was pharmacologically blocked, this difference disappeared.

However, in this acute experiment, insulin secretion showed no significant difference under any condition.

Meanwhile, in the same paper’s 12-week feeding experiment, both fasting active GLP-1 and insulin were significantly higher in the long-term chewing group (p<0.05), and pancreatic β-cell area was also significantly larger. However, there was no significant difference between the groups in body weight, blood glucose, or the oral glucose tolerance test.

The authors themselves distinguish between the two, writing that “chewing did not affect insulin secretion, but chewing habit did affect insulin secretion.”

In other words, the storyline at the center of this article — that chewing each bite triggers early-phase insulin secretion for that meal — is not supported by this study. What is supported is a different, time-scale story: that fasting values change when chewing is sustained as a habit. The article had folded these together into a single “perfect linked mechanism.”

E05: A Human Trial

E05 is a within-subject crossover trial in which 50 healthy adults ate 28g of walnuts either whole or as a paste. Fullness was higher, and hunger lower, with whole nuts (p<0.05).

Meanwhile, blood glucose, insulin, and active GLP-1 all showed no significant difference.

This article previously cited E05 as the basis for the instruction to “chew the first bite at least 30 times.” This study did not compare specified chewing counts, and it did not measure early-phase insulin secretion.

E14: A Systematic Review of Chewing and Obesity

E14 is a systematic review of 18 studies (16 cross-sectional, 1 cohort, 1 RCT). Reduced masticatory function is associated with obesity in many cross-sectional studies, and the only RCT (an eight-week gum-chewing intervention) found a significant reduction in waist circumference. The authors themselves conclude that, since most of the evidence is cross-sectional, causality has not been established.

Neither GLP-1 nor insulin was within the scope of this review. This article previously cited E14 as the basis for “early release of GLP-1.”

What We Removed

“The pancreas panics” and “continues to oversecrete more insulin than necessary with a delay” — none of the studies this site cites show that insufficient chewing produces this state
“The moment you chew the very first bite 5 times and swallow it, the chance for that meal’s early-phase insulin secretion is lost forever” — this has no source
“There is only one thing that must be done before medication or strict carbohydrate restriction” — no trial compares chewing against medication or dietary therapy
“The most powerful, zero-cost bulletproof vest to protect the pancreas” — same as above

What Can Be Said Within the Evidence

In mice, the group that chewed solid food had higher active GLP-1 30 minutes after intake (not peer-reviewed, n=10)
In the same study’s acute experiment, insulin secretion showed no difference
In the same study’s 12-week feeding experiment, fasting insulin and GLP-1 were significantly higher in the chewing group, though there was no difference in body weight, blood glucose, or the glucose tolerance test
In humans, eating in a chewier form produced higher fullness (50 adults)
In the same study, blood glucose, insulin, and active GLP-1 showed no difference
Reduced masticatory function is associated with obesity in many cross-sectional studies, but causality is not established

Small trials in humans that manipulated the chewing count itself have reported increases in active GLP-1. The originals were verified in August 2026 and added as E17–E19. It cannot be written in a way that reads as “nothing has been found in humans.”

However, on insulin — the subject of this article — none of the three found a difference.

E17 (Sonoki et al. 2013) — thirty chews raised GLP-1, but glucose and insulin did not change under any condition; in type 2 diabetics even GLP-1 showed no significant difference
E19 (Xu J et al. 2015) — gum chewing raised GLP-1 significantly, but glucose, insulin and GIP showed no significant differences
E18 (Li J et al. 2011) — reports energy intake and GLP-1, but did not measure first-phase insulin. Full text unverified

So in the trials that specified a chewing count, GLP-1 moved but insulin release did not.

Trials That Varied Food Form Disagree With Each Other

On 13 August 2026 this article stated that no result anywhere showed a change in insulin release. That was an overstatement. One further trial was verified the same day and added as E20.

E20 (Kamemoto et al. 2024) is a randomised crossover trial in 19 healthy young men comparing shredded cabbage eaten with chewing against the same cabbage pureed and swallowed without chewing. The incremental areas under the curve for insulin and GIP were higher in the chewing condition (p=0.019 and p=0.009).

But the same trial also produced these results.

Glucose showed no difference in area under the curve, and at 30 minutes it was actually higher in the chewing condition (p=0.007)
GLP-1 was higher at 45–90 minutes but lower at 120 and 180 minutes, with no difference in the overall GLP-1 area under the curve
It was funded by Kewpie Corporation, and 3 of the 9 authors are employees of that company

And what E20 varied is not the chewing count but the form of the food. E05, which used the same design (walnuts whole versus paste), found no difference in insulin, glucose or GLP-1.

Laid out:

Trials specifying a chewing count (E17, E19) — a difference in GLP-1, none in insulin
Trials varying food form — E05 found no differences at all; E20 found differences in insulin and GIP (but none in glucose, and it was industry-funded)

This is not a state in which one can say that chewing well brings first-phase insulin into order. There is one report of insulin moving; it was not a chewing-count trial, blood glucose did not improve, and the funding came from a company.

If You Are Concerned About Your Blood Glucose

If a health checkup flagged your blood glucose or HbA1c, please see a physician. This site has not identified a study showing that chewing can substitute for that.

Whether dietary therapy or medication is needed requires a physician’s judgment based on test results and clinical course. This site introduces research on chewing and has not been reviewed by a medical professional.