Absolutely! Understanding the lifestyle, environment, and genetics of healthy people is just as valuable as understanding those factors for people managing diseases or chronic conditions. Research into wellness is increasing as more researchers focus on predisposition to and prevention of disease.
Additionally, healthy people may serve as "controls" for disease studies. That is, to truly understand factors that may be causing or affecting a disease, researchers need to ensure that those factors are not also seen in people without that disease. Being able to include a group of people whose health records prove they don't have certain symptoms or conditions is extremely powerful for researchers!