Both fat and thin people taking part in studies over a 22-year period had put on weight –and the increase was proportionately the same.
So, six young men were placed in special climate rooms, where some of them were exposed to increased amounts of CO2. After seven hours, the men were allowed to eat as much as they liked.
The men with the greater amount of CO2 in their blood ate six percent more food than the men who had been in climate rooms with a normal amount of CO2.
This discovery made it possible to develop a precise hypothesis for how CO2 makes us fatter: We breathe more CO2, which makes our blood more acidic; this affects our brain, so we want to eat more.
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