Background: Allergic and inflammatory conditions have been increasing over the years. Many factors may play a role in this. Every day, people are exposed to pollution and chemicals in our foods, clothing, and all of the cleaning, hygiene, and other products we use. Studies have suggested there may be links between these environmental exposures and allergic and inflammatory illnesses. Researchers want to know more about how these exposures affect our health. Objective: To learn how everyday exposure to common substances affects people's health. Eligibility: Healthy people aged 18 to 80 years. Design: Participants will have 2 stays in the hospital. Each stay will last 7 days, and the stays will be spaced 4 to 6 weeks apart. During both stays, participants will remain confined to their room. They will eat only food from the menu, and they will use only provided products for personal care. (They may bring their own electronic devices, such as their phone and computer.) One stay will be in a pure room. Participants will breathe filtered air, eat unprocessed foods, and use personal care products with fewer chemicals. One stay will be in a room that allows exposure to common environmental chemicals. Some participants will be limited to only 1 type of exposure: chemicals thought to affect only skin, gut, or respiratory health. Some participants will be exposed to all 3 types. Participants will undergo testing. Blood, skin cell, urine, mouth swabs, and stool samples will be taken. They will have lung tests, smell tests, and tests that measure the health of their skin. These tests will be repeated in outpatient visits 2 weeks after each hospital stay....
Age range
18 Years – 80 Years
Sex
ALL
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Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Cohort 1 (skin): The primary endpoint for the skin substudy is the skin impedance change response from the common environment.
Timeframe: Baseline and completion of inpatient stay
Cohort 2 (GI): The primary endpoint for the GI substudy is analogous to that of the skin substudy, except replacing skin impedance with the Shannon-Weaver diversity index measured on the gut microbiome that measures metabolic diversity.
Timeframe: Baseline and completion of inpatient stay
Cohort 2 (Airway): The primary endpoint for the airway substudy is the airway maximum change response from the common environment minus the airway maximum change response from the pure environment.
Timeframe: Baseline and completion of inpatient stay
Based on combined exposures from all 3 organ systems and randomization design, repeat primary and secondary endpoint responses of Stage 1.
Timeframe: Baseline and completion of inpatient stay