Satiety, the technical name for feeling full or otherwise without need to eat, doesn’t just involve the amount of content in your stomach. There are various hormones and chemicals that regulate it such as serotonin and orexin, and the body can release these in response to blood sugar, sensing nutrition entering the digestive system, or because of other responses like anxiety, nausea, etc.
Feeling anxious often makes you feel less hungry because the body is effectively deciding there are more important issues than eating right now.
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