Dehydration is known to

not affect brain functions.
slow or stop efficient fat elimination and metabolism. lead to cases of diarrhea.
cause skin to take on a soft, supple texture.

Dehydration is actually known to affect brain functions. When the body doesn't have enough water, it can lead to cognitive decline, difficulty concentrating, fatigue, and other neurological symptoms.

Dehydration can also affect the body's ability to eliminate fats efficiently and may slow down metabolism. Inadequate hydration can disrupt the normal functioning of the liver and kidneys, which are essential for efficient fat metabolism.

Dehydration can sometimes lead to cases of diarrhea, especially in cases of severe dehydration. When the body is dehydrated, it may try to compensate by pulling water from the intestines, resulting in loose stools.

Contrary to the statement, dehydration actually causes the skin to become dry, tight, and less supple. When the body is dehydrated, the skin loses moisture, which can make it appear dull, flaky, and less elastic.