Dec 20, 2023

Informed Consent

TITLE: Use of Continuous Glucose Monitoring in Non-Diabetic Population to Compliment Signos mHealth Platform: Comprehensive Weight Optimization Program and Customized Lifestyle Changes

SHORT TITLE: The Signos Empowerment Study


WCG IRB Protocol #20212524

SPONSOR: Signos Inc.

INVESTIGATOR: Stephanie Kim, M.D., MPH

2625 Middlefield Road #720

Palo Alto, CA 94306


PHONE NUMBER(S): (650) 263-4502 (24 Hours)

Taking part in this study is voluntary.

Your participation in this study is voluntary. You do not have to be in this study if you do not want to, and you can leave the study at any time. This study is being conducted by Stephanie Kim, M.D. and her team. Please read all sections of the informed consent document.

As one of the Signos subscribed users, you are being asked to take part in this study. Users that are part of Signos fee-based subscription app via smartphone are asked to participate in this study for assessing effect of continuous glucose monitoring for general wellness and weight optimization. We ask that you read this document carefully and ask any questions you may have before agreeing to be in the study. After reading the consent form, if you would like to participate, you will be asked to sign this form. You will be given a signed copy of the consent form for your records.

What is the purpose of this study? The purpose of the study is to use continuous glucose data for general wellness for participating Signos users that utilizes diet, exercise, eating, and lifestyle habits. The Signos app will integrate the data to recommend customized solutions to alter lifestyles in order to optimize weight management. The Signos smartphone app (iOS/Android) uses an algorithm to incentivize subjects to adhere to weight loss efforts and to incorporate healthier habits. The Signos smartphone app will use CGM (continuous glucose monitoring) data for prolonged retention of healthier habits.

How many people are we expecting to take part in this study? If you agree to participate, you will be one of the about 50,000 subjects who will be participating in this study. Your participation will last approximately for a total of up to 6 years. The Signos app will collect CGM data for up to 5 years and one year of additional follow-up after the cessation of period of use of CGM.

Will you benefit from taking part in this study? You may or may not personally benefit from being in this research study. Some of the potential benefits of study participation may include weight management (e.g., weight loss), development of healthy eating habits, including portion control, elimination of frequent snacking, and reduced portion sizes, identification of irregular blood glucose levels, etc. We hope that the CGM information integration will provide you with recommendations to help you manage your weight effectively.

Who can participate in the study? To take part in this study, you must be or have the following:

  • Be at least 18 years old or above
  • Own a Smartphone and be willing to install the Signos App to personally receive text messages or have access to a web-based survey to self-report weight.
  • Willingness to complete quality of life questionnaire
  • Use CGM device
  • Understand written and spoken English
  • Signos mHealth app user

There are some exclusion criteria that may prevent you from being part of the study. You will not be able to participate in the study if you have any of the following:

  • Medical diagnosis of Type 1 or 2 Diabetes
  • Current medical diagnosis of an eating disorder (anorexia or bulimia)
  • Medical conditions (e.g., such as seizure disorder) requiring a specific medical diet.
  • Inborn error of metabolism such as phenylketonuria (PKU), glycogen storage disease, fructose intolerance, Maple Sugar Urine Disease (MSUD).
  • Chronic or severe disease (e.g., chronic obstructive pulmonary disease [COPD], coronary artery disease, cerebrovascular accident [CVA], or cardiac arrhythmia) that would preclude a subject from safely participating in diet and/or physical activity as determined by individual review. 
  • History of 10 or more soft tissue skin infections (such as cellulitis or abscesses)
  • Intolerable skin reaction from adhesive
  • Currently taking any of the following medications: Clozapine, Hydroxyurea, insulin, sulfonylureas, or medications prescribed specifically for the treatment of diagnosed diabetes
  • Vulnerable populations such as minors, prisoners, or pregnant women will not be enrolled in this study.
  • Inability or unwillingness of subject to give informed consent
  • Long term systemic corticosteroid exposure

What does this study involve? Once you are interested, information about study procedures and requirements will be provided for your review. Additionally, an oral glucose tolerance test (OGTT) may be performed. If you decide to participate, the study team will review inclusion and exclusion criteria and an informed consent process is completed in the Signos platform. A telemedicine physician may review the eligibility and prescribe CGM via a designated pharmacy. The pharmacy will ship the CGM with instructions to the participant. The study will assess how well CGM data works in customizing your weight management program using an integrated algorithm of the Signos mHealth smartphone app.  The CGM will measure your glucose level in the fluid under the skin by way of sensor pins inserted into the skin. The CGM sends glucose readings to the Signos app. The Signos app stores the readings in a “real-time” mode where the numbers from the CGM are constantly shown on the Signos app display.

Your documentation may be reviewed by an independent physician. A prescription for CGM may be written by the physician to a designated pharmacy. You will receive a study kit along with the CGM from the study sponsor with video instructions on how to use the CGM. The kit will include education and training on the CGM system that will provide your glucose data. The CGM system to be used in the study is made by Dexcom, Inc.

The CGM will alert when it needs to be replaced. The first insertion will be known by the study team at insertion via the Signos app. The removal and next insertions will also be recorded in the app.

The Dexcom sensor at times may cause false high sensor readings (glucose is not affected) if higher than the maximum dose (e.g., greater than 1 gram every 6 hours) of acetaminophen (the ingredient in Tylenol) is used. Therefore, you should not use a higher than the maximum dose (e.g., greater than 1 gram every 6 hours) of acetaminophen and medications containing acetaminophen for at least 24 hours before sensor insertion and while the sensor is being used. You can take the standard or maximum dose of acetaminophen of 1 gram (1,000 mg) every 6 hours and still use the Dexcom CGM. Please update your information in the mHealth app if you are taking acetaminophen- containing medicine for a short interval. During the course of the study, study team will integrate CGM data to other information (e.g. basic demographics, activities, identification and withdrawal of food using a variety of techniques such as gross pictures, motivational tools, coping skills to avoid comfort eating and white noise etc.) that are standard features of the Signos app. Amount of food, snacking panel, and some of the other features on the app are integrated to provide customized recommendations that motivate your engagement in a healthier lifestyle. Thus, your participation in this study requires the use of Dexcom CGM (glucose data) integration with diet, exercise, eating habits, water, food intake, sleep habits, etc. in the Signos adaptive algorithm. The app will provide you personalized recommendations for lifestyle changes. You will be suggested to implement changes in your daily habits for optimal weight optimization using various rewards and incentives. You will have the option to take this weight optimization program with your friends and family as fostering camaraderie, encouraging fitness activities, and promoting healthier habits encourage retentive performance. You will also have the option to invite your friends and create competitive requests to work together in achieving goals toward weight optimization. Program participants will have the option to work out together, swap healthy recipes, and talk about their goals. Consider creating long-term initiatives, such as running groups, healthy cooking classes, or yoga, bets, clubs, that will help participants extend their health success long after the challenge ends.

What are the options if you do not want to take part in this study? Your participation in this study is voluntary. You do not have to be in this study if you do not want to, and you can leave the study at any time. You will not be subject to any penalties or lose any services, benefits, or rights to which you would be otherwise entitled if you chose not to be in the study or if you leave the study early. Your alternative to being in this study includes participate in structured medical or activity weight loss programs.

What are the risks involved with being enrolled in this study?

This study involves an investigational device Dexcom CGM and Signos App because the US Food and Drug Administration (FDA) has not approved this device and app for weight optimization in the non-diabetic population.

Risk of Drinking Glucose (Sugar Water): About one out of ten people have mild nausea or an upset stomach with the glucose (sugar) drink that may be given during the optional oral glucose test. Rarely some people may experience a reaction (symptoms like nervousness or sweating) at the end of the test. You will be asked to keep a snack handy and available to guard against this. This test is not a requirement of study participation.

Increasing the blood sugar level rapidly may cause a warm sensation all over, lasting a few seconds.

You may feel uncomfortable answering some of the questions. You can choose to skip or stop answering questions at any time.  Data will be utilized to update the algorithms and after the end of the study, all identifiable data about you will be de-identified, meaning we may retain and share certain elements of the study records for future research, but we will replace your identifying information with a code that does not directly identify you. This research involves the potential risk of accidental release of confidential information. We are careful to ensure that the information you voluntarily provide to us is as secure as possible; however, you must be aware that transmissions over the Internet cannot be guaranteed to be completely secure. Although every reasonable effort has been taken, privacy and anonymity during Internet interactions cannot be guaranteed. It is possible that additional information beyond that collected for research purposes may be captured and used by others not associated with this study. The web includes elements that are not always evident, including online tracking mechanisms. As you move from one site to another, third parties not involved in this research, may “watch” your online activity, including your visit to our research site. That third party may employ security and privacy policies different than ours, over which we have no control.

The research may involve risks to the subject which are currently unforeseeable. Your private information and your medical record will be shared with individuals and organizations that conduct or watch over this research, including:

  • The research sponsor
  • People who work with the research sponsor
  • Government agencies, such as the U.S. Food and Drug Administration (FDA)
  • The Institutional Review Board (IRB) that reviewed this research. The IRB is a group of scientists and non-scientists who review the ethics of research. The goal of the IRB is to protect the rights and welfare of study subjects.

Risk of Dexcom CGM

  • The Dexcom CGM must be removed prior to Magnetic Resonance Imaging (MRI), CT scan, or diathermy treatment. The Dexcom CGM System has not been tested during MRI or CT scans or with diathermy treatment, and it is unknown if there are safety or performance issues.
  • Taking acetaminophen (paracetamol) containing products (such as Tylenol) while wearing the sensor may falsely raise your sensor glucose readings. The level of inaccuracy depends on the amount of acetaminophen (paracetamol) active in your body.
  • If your CGM case is damaged/cracked, do not use it, as this could create an electrical safety hazard or malfunction.
  • Redness at the sensor insertion site, skin irritation (erythema/edema), local infection, inflammation, pain or discomfort, bleeding at the glucose sensor insertion site, bruising, itching, scarring or skin discoloration, hematoma, tape irritation, sensor or needle fracture during insertion, wear or removal

Can I be part of the study if I am not interested in weight management? Yes, if you are not interested in weight management, we are still interested in your participation. The app will provide lifestyle recommendations for general wellness.

Other important items you should know:

Leaving the study: You may choose to stop taking part in this study at any time for any reason. If you decide to stop taking part, it will have no effect on the quality of medical care. The investigator reserves the right to stop the study participant from continuing without participant consent.

New Information: New information related to this research will be made known to you when it becomes available. This may affect your decision to stay in this study.

Funding: The study is funded and managed by Signos Inc., where multi-disciplinary experts are dedicated to utilizing CGM data and optimizing the weight management program by providing customized recommendations to individual participants.

What about the costs of this study? You will not be paid to participate in this study. You or your health insurance plan may have to pay for medical costs including CGM that are part of this study. If you have insurance, your insurance company may or may not pay for these costs. If you do not have insurance, or if your insurance company refuses to pay, you will have to pay.  You should discuss any questions you have about costs with the study doctor or study team.

If you are diagnosed with any diabetes during the course of participation, you will be asked to move to a different clinical study (SIGNOS-201) designed to test in subjects with Type 2 Diabetes based on eligibility (inclusion-exclusion criteria) for the study. For diabetes related complications, all medical referrals will be covered through your regular healthcare insurance. You or your insurance plan will be expected to pay for the costs of such referral medical care.

Financial interest disclosure: The Sponsor has disclosed that they have a personal interest related to this study. Please ask any questions to assure yourself that this relationship has not overly influenced the conduct of this research study. If you require further information, please contact the principal investigator or WCG IRB to ask questions or discuss concerns. There is also a study independent ombudsman who is available for any further information.

A description of this clinical trial will be available on, as required by U.S. Law. This Web site will not include information that can identify you. At most, the Web site will include a summary of the results. You can search this Web site at any time.

Whom should you call with questions about this study? If you have any questions, concerns, or complaints about this study, or feel you may have had a reaction to the investigational product or you may have experienced a research-related injury, contact: Dr. Stephanie Kim, M.D. at or (650) 263-4502 24 hours. If you have questions, concerns, or complaints, or think this research has hurt you, talk to the research team at the phone number listed above.

This research is being overseen by WCG IRB. WCG IRB is a group of people who perform an independent review of research studies. You may talk to them at 855-818-2289, if:

  • You have questions, concerns, or complaints that are not being answered by the research team.
  • You are not getting answers from the research team.
  • You cannot reach the research team.
  • You want to talk to someone else about the research.
  • You have questions about your rights as a research subject


I have read the above information about Signos Empowerment Study and have been given time to ask questions. I agree to take part in this study, and I have been given a copy of this signed consent form.

X________________       X______________________

Name of participant      Date electronically signed

X_______________________            X______________________

Name of study investigator            Date electronically signed


Who may use or see your health information? By signing this form, you allow the research team to use your health information and give it to others involved in the research. The sponsor’s research team includes the study investigator and others working on this study at Signos Inc., its affiliates, and collaborators. The information collected for this study may be used by researchers and sponsor of the study. Some of the information used in this study, called Protected Health Information ("PHI"), is protected by federal privacy laws. By signing this consent form, you give your permission to have your PHI collected, used, and disclosed for the purposes of this study.

After the study staff or study doctor discloses your PHI to others, it could be re-disclosed and no longer protected by federal privacy laws.

Your permission to use your health information for this study will be good until December 31, 2070. During this study, you and others who take part in the study may not have access to the study data. You may ask for study data once the study is over. You have a right to receive a copy of the information in your medical record at any time. It is possible for a court or government official to order the release of study data including information about you.

What if you decide not to give permission to use and share your personal health information? If you do not allow the use of your CGM and health information for this study, you may not take part in this study. If you choose to stop taking part in this study, you may cancel permission for the use of your health information. You should let the researcher know if you want to cancel your permission. The Signos team will assist you in putting your wishes in writing. Information collected for the study before your permission is canceled will continue to be used in the research.

X_________________            X______________________

Name of participant            Date electronically signed