title: Reply to the letter to the editor.
authors.affiliation: Hydration Science Lab, University of Arkansas, Fayetteville, AR, USA. kavouras@uark.edu.
authors.forename: Stavros A
authors.initials: SA
authors.lastname: Kavouras
authors.affiliation: Laboratory of Nutrition and Clinical Dietetics, Harokopio University, Athens, Greece.
authors.forename: Giannis
authors.initials: G
authors.lastname: Arnaoutis