Coffee Intake Biomarker Validation and Association With Respiratory Diseases

Inclusion Criteria: * Regular coffee drinkers aged 21-64 years old, Chinese ethnicity Exclusion Criteria: * Healthy individuals who are regular coffee and/or tea drinkers, aged 21-64 years old of Chinese ethnicity with no severe medical conditions and are physically-abled, can participate in the research. However, you cannot participate in or will be released from this study if the following conditions or situations apply to you: * Ineligible screening survey which will consist of basic demographic information and questions pertaining to inclusion/exclusion criteria such as age, gender, current medications, chronic illness, etc * Dislike drinking coffee and tea * Pregnant or breastfeeding * Certain medications including Zanaflex, Sirasalud, Ketanest S, Spravato and Ephedrine Sulfate (See full list of medication) * Present medical conditions: cancer, cardiometabolic diseases, endocrine diseases, depression, anxiety, caffeine/lactose intolerant, fear of needles and/or blood disorders * Recent history of major surgical operations * Past or current user of oral/systemic hormone treatment or therapies * Taken antibiotics in the last 3 months * Taking nutritional supplements (that contains coffee/tea-related compounds naturally found in other plants) * Not willing to travel to the University for the study * Unable to commit to completing all the sessions in the 10-week intervention study