Transdermal Optical Imaging (TOI) as a Non-invasive Measure to Detect Changes in Hydration Status in Healthy Adults and Athletes

Inclusion Criteria: Both Study Arms (GENPOP and ATHLETE) * Subject is male or female * If female, subject is not pregnant * Subject is willing to avoid alcohol consumption 24 hours prior to visit(s) * Subject is willing to avoid wearing makeup to the study session or willing to remove it with facial wipes before the face scans * Subject is willing to shave facial hair if predetermined during the informed consent session it will interfere with TOI measurement * Able to speak, write, and read English * Provision of written consent to participate GENPOP Study * Study subject is 18-65 years of age, inclusive * Subject does not smoke (or has quit for at least 6 months) * Subject is not taking medication that may interfere with the study * Subject has no health conditions that would prevent completion of the trial as indicated on the general health questionnaire (GHQ) * Subject is willing to fast overnight (\~8-12 hours) * Subject is willing to refrain from vigorous exercise for 48 hours * Subject is willing to eat the exact same food the day prior to each visit to the testing site ATHLETE Study * Study subject is 14-45 years of age, inclusive * Subject is participating in team sport training/competition * Subject is participating in a coach-led practice Exclusion Criteria: Both Study Arms (GENPOP and ATHLETE) * Subject has participated or currently enrolled in a clinical trial within the past 30 days * Subject has participated in any PepsiCo trial within past 6 months * S…