What are the two types of thirst?

There are two main types of thirst explained by Andrew Huberman:

1. Osmotic Thirst: This type of thirst occurs when there is a high concentration of salt in the bloodstream. It is typically triggered by the ingestion of salty foods, which raises the sodium level in the blood, thereby activating neurons that detect osmolarity changes. The body's response is to promote drinking in an attempt to dilute the salt concentration and maintain balance 1.

2. Hypovolemic Thirst: This occurs due to a reduction in blood volume and blood pressure, which can be caused by conditions like severe blood loss, vomiting, or diarrhea. In response, neurons that sense changes in blood pressure activate pathways to increase thirst. This type of thirst not only seeks water but may also involve a desire for salty fluids or foods to help retain water and restore blood volume 2.

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     1

     Understanding Thirst

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     2

     Thirst Mechanisms

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