Frequently Asked Questions

  • 1. What requirements must I meet in order to join the SUN Project?

    You must be a university graduate. And have the motivation to be consistent in filling out our questionnaires over the years.

  • 2. When can I join the SUN Project?

    At any time, since it is a dynamic—i.e. open—cohort.

  • 3. How many persons participate in the SUN Project?

    You can check this information here.

  • 4. What is being researched in the SUN Project?

    In general, we are researching lifestyles that can improve the health and quality of life of the population. Principally nutritional factors, but also physical activity, smoking habits, etc., in relation to the incidence of cardiovascular disease, diabetes, obesity, cognitive deterioration and other illnesses.

  • 5. How can I join the SUN Project?

    Via an invitation through professional associations or university groups, or by means of an individual request, contacting us directly:

  • 6. What does participation consist in?

    Participating in the SUN Project consists in responding to questionnaires concerning diet and health every two years. The first questionnaire is the longest, since it is necessary to obtain a variety of data concerning lifestyle. Nevertheless, the follow-up questionnaires sent every two years will only take you about 10 minutes to fill out. 

    During the follow-up you may be invited to participate in one or more sub-studies on concrete topics, in which you may participate on a totally voluntary basis without this affecting your participation in the SUN Project.

  • 7. Will I receive anything in return for participating?

    No, participation in this study is totally altruistic, but your collaboration is invaluable. You can feel very proud of contributing to the search for scientific evidence which will permit improving the health of the population and that of future generations.

  • 8. What types of questions are on the questionnaires?

    The questionnaires include questions about the incidence of illnesses, medication, lifestyles, physical exercise, tobacco and diet. The first questionnaire includes a section on the frequency of consumption of foods that collects detailed information about foods, drinks and vitamin and mineral supplements ingested over the past year.

  • 9. Does the SUN Project share any information concerning its participants?

    No. All the information collected is saved in a confidential manner and the identity of the participants is never shared. The collection of personal data such as mailing and email addresses have the single and exclusive purpose of making it possible to track the participants.

  • 10. Is my data secure? Who will have access to my data?

    The security of participants' data, both personal and medical, is our priority. We maintain your name and address in secure files. The data provided by your response to the questionnaires is stored separately with a unique identification number, such that your medical data is never associated with a name. The project researchers only have access to this data, identified with a number.

    All personal data is managed by the SUN technical team, which has signed a contract of data confidentiality.

  • 11. What do the SUN sub-studies consist in?

    If you participate in one of the sub-studies of the Project (diabetes, cancer, memory, etc.) and have a question, consult us by sending an email to indicating your questionnaire number and the sub-study to which you belong.

  • 12. What is the rate of response to the follow-up questionnaires?

    Approximately 90%.

  • 13. Can I have access to a scientific article published with data from the SUN Project?

    Yes, you need only visit the publications section of this website and click on the article that interests you.

  • 14. What does the option to answer the questionnaires online consist in?

    If you mark “YES” in the checkbox “I want to receive the questionnaire by email” on your personal page (once you have entered the questionnaire number and password) you will automatically receive an email instead of a letter by post when it is time for you to respond to one of the follow-up questionnaires. In this email, we will provide you with your access credentials and a link to the web page where you can find your personal page, along with the questionnaire to be filled out. 

    This modality, in addition to being a rapid and comfortable tool for participants, avoids possible losses of the questionnaires in the mail.

  • 15. How do I fill out the Internet questionnaire?

    The access page is the following (it functions best with Internet Explorer):

    The user identification that you will need consists of the questionnaire number and the password which we sent you in the letter. Sometimes there will appear a new screen requesting the updating of your password; if this occurs, please enter the password two times. 

    If you have forgotten or lost your access credentials, send an email to us at and we will send them to you as rapidly as possible.

  • 16. How can I change my contact information (email or mailing address)?

    You can correct or change your personal data and/or contact information from the following web page. The access credentials you will need are the questionnaire number and the password which we sent you in the letter. Sometimes there will appear a new screen requesting the updating of your password; if this occurs, please enter the password two times.

    You can also send an email to us at indicating to us the data which you wish to have changed.

  • 17. How long will the study last?

    We anticipate that the SUN Project will be a long-term study. Although we have encountered diverse relationships between diet and illness, it is known that some effects of a given lifestyle may take various years to appear. The SUN Project began in 1999 and is continually growing, thanks to the fact that 90% of cohort recruits participate actively by answering the follow-up questionnaire.

  • 18. If I take a special medication or suffer from some illness, may I participate?

    Yes, you simply need to indicate your special condition in the corresponding section of the questionnaire.

  • 19. If I'm pregnant, can I respond to the questionnaire?

    Yes, you simply need to indicate your special condition in the corresponding section of the questionnaire.

  • 20. What can I do if I have a question that has not been answered here?

    If you are a participant in the study or simply are interested in the SUN Project and you have a question that has not been answered, you may send us an email at and we will respond as best we can.


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