German nutritional expert, Ante Gall, said that fluid deficiency in the body can be inferred by noticing some symptoms.
Gall explained that the symptoms are:
1- Headache.
2- The Vertigo.
3- Weak focus.
4- Kidney pain.
5- Decreased urine output.
6- The dark color and the pungent odor.
7- Constipation and thick stools.
8- Dryness and chapped lips.
9- The appearance of wrinkles on the back of the hand, forearm and thigh.
Gal noted that the lack of fluids in the body is mostly due to a decreased feeling of thirst due to age or injury to a disease, stressing the need to supply the body with fluids adequately at a rate of not less than a liter and a half per day.