It’s a mix of pyschology and physiology.
On the physiological level, part of hunger is about blood sugar. When blood sugar gets low, the brain notices that and makes us feel hungry, since eating will solve that problem. Mints won’t fill your stomach, but they do contain sugar. That will temporarily spike your blood sugar, very briefly ending that low blood sugar response.
On the psychological level, when we eat, our brains assume that we won’t be hungry after we’ve done that, so it gets all satisfied and then slowly figures out that it is actually still hungry.
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