Fifteen women, a ventilated hood, and 100 g of celery: digesting it cost 13.76 of the 16 calories it delivered. That is 86% — far closer to free than we first said. It is still not negative, and the researchers said so themselves.
Measured against no gum, chewing raises energy expenditure by about 0.06 kcal a minute — roughly a third of an almond per hour. A 201-person trial with 95% adherence chewed 90 minutes a day for eight weeks and lost nothing.
Oxidise 10 kg of fat and 8.4 kg of it is exhaled as carbon dioxide. Eccrine sweat is water, sodium and chloride — lipid is not a meaningful constituent. You cannot sweat out something that is not in the sweat.
The famous 30% metabolism boost works out to about 24 calories, and two later labs could not reproduce it at all. What two randomised trials do support is duller and more useful: a glass before meals, for a couple of pounds over twelve weeks.
By volume, yes — that is chemistry. But in a 12-week trial people gained about 2.6 lb of lean mass while losing up to 7 lb of fat, so their weight went down, not flat. And the density constant everyone quotes was measured in rabbits and dogs.
The only randomised trial of a corset for weight control watched compliance fall from 100% to 10% in nine months — the authors said it 'could therefore not be evaluated.' There is no mechanism, and the one measured effect of abdominal compression is worse reflux.
Cold exposure does raise the calories you burn, and over weeks of daily cold air one study trimmed fat mass slightly. But the research used hours of cool air, not a three-minute plunge — and no study shows a cold plunge takes fat off.
If you’ve been training hard, eating well, and still watching belly fat…
You know the routine: hard session, decent dinner, a couple more messages…
A randomised trial in 120 older adults found aerobic exercise grew the hippocampus by 2% and improved memory — that part is real. The famous 'four times faster' figure comes from mouse cells in a dish, and the phrase does not appear anywhere in the paper it is credited to. It entered at the press release.