How much do we pay every day “to become healthy”? Personal gym memberships, protein powder, supplements for gut health. Kept up seriously, that adds up to tens of thousands of yen a month.
Against that, changing how much you chew costs nothing. No equipment, no recurring payment. But “the cost is zero, so the return must be good” needs a numerator — something on the benefit side. This article tries to estimate it, and the short answer is that the numbers are not there.
What has actually been measured on the benefit side
1. GLP-1
GLP-1 receptor agonists prescribed at diet clinics are expensive and carry side-effect risks. Chewing does raise GLP-1 too, but the two cannot be put side by side. The drugs raise GLP-1 to pharmacological levels; the rise measured in E17 and E19 is within the physiological range, in the same trials neither glucose nor insulin changed, and no trial measured body weight. This does not mean chewing substitutes for medication.
So “you save on the drug” is not a calculation that can be made here. This site cites no study that compared chewing against medication, or that showed a GLP-1 rise from chewing making a prescription unnecessary.
2. DIT (diet-induced thermogenesis)
E03 gave a liquid meal to 11 healthy young men and measured energy expenditure over 90 minutes. The values were 3.4 → 5.6 → 7.4 kcal: the gap between the chewing condition and the control is about 4 kcal.
This article previously described that gap as “several tens of kilocalories per meal” and said a year of it equalled several kilograms of fat. That is too far from the original number. Even multiplying 4 kcal by 3 meals × 365 days gives about 4,400 kcal — roughly 0.6 kg of fat. And on top of that:
- E03 measured 90 minutes, not a full day’s expenditure.
- It used a liquid meal; whether the same gap appears with ordinary food was not measured.
- It was a single measurement in 11 people; whether the gap persists over a year is unknown.
The moment you do the multiplication, it stops being a measurement and becomes a guess. This article stops before the multiplication.
On national-level estimates
What if policy nudged up the hardness of the bread and bento sold in convenience stores, so that everyone “had no choice but to chew ten more times than now”? It is a question worth asking, but there is nothing here to answer it with.
This article previously cited E06 as an epidemiological model for this section. E06 is a systematic review of swallowing and the digestive tract; it contains no cost estimate. It also listed “lower national calorie intake through normalisation of the satiety centre” and “delayed dementia risk through increased cerebral blood flow” as effects; this site can cite no study supporting either.
A slower eating pace should follow. But in the trials that specified a chewing count (E17, E19), neither glucose nor insulin changed.
What this article can claim
Chewing more costs nothing. That much holds. Whether it is a better deal than other health measures cannot be said, because no study compared them. Cost-effectiveness needs a numerator as well as a denominator, and right now the numerator is about 4 kcal of DIT and a GLP-1 rise that moved neither glucose nor insulin. Turning that into “the gym fee pays for itself” is still a long way off.
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