An interventional study of Regulation Of Craving Training (ROC-T) and Control group in Loneliness, Anxiety and Health-Related Behavior, sponsored by Jacobs University Bremen gGmbH. Completed at 1 site in Germany. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-11.
Sponsored by Jacobs University Bremen gGmbH · Not applicable, Interventional, and Prevention
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Among 18 studies in Health Behavior with a site in Germany — 1 open to participants now, 3 under way, none of them phase 3. Health Behavior · Germany.
Among the 18 studies in Health Behavior with a site in Germany, this one is the 2nd largest by enrollment of the 12 interventional ones that give a count, is the only one that started in 2024, is one of 12 with no phase, and was the 15th registered.
969 studies on the registry are indexed under Health Behavior; 167 are open to participants now.
Browse Health Behavior studies →1 of the 18 studies in Health Behavior with a site in Germany is open now. Recruiting first, the newest first:
Jacobs University Bremen gGmbH · Sites in Germany
Ages 18+ · Healthy volunteers
A study can be open while its sites in Germany have not opened yet or have stopped. Only those recruiting at a site in Germany →
Of the 94 Health Behavior studies recruiting now, 40 (43%) set no upper age limit and 37 (39%) stop at 75 or younger; 25 take children under 18; 59 take healthy volunteers.
This study: 18 Years and older · all sexes · healthy volunteers too.
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18 studies; the count open now beside each. This study's row is marked.
First in 2011; this study’s year is marked. 1 started in 2024.
This study's enrollment of 1,684 is above the median of 150 across 826 interventional studies indexed under Health Behavior.
Median enrollment 319 across the 12 interventional studies, 526 across the 6 observational. Of the 13 that completed or were terminated, 1 (8%) have results posted.
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1 of 18 have an industry lead sponsor. The 10 most frequent:
Jacobs University Bremen gGmbH is the lead sponsor of 15 studies on the registry; 1 is open to participants now.
Jacobs University Bremen gGmbH has 6 studies filed under Health Behavior — fewer than ten, so there is no comparison to draw.
None of the studies under way reaches primary completion within a year.
Among the 18 studies in Health Behavior with a site in Germany, from their registry updates:
This tab as a report to print or save as PDF → With an account.
The aim of this 3-phase study is the evaluation of planetary health behaviors and its cognitive processes in relation to levels of eco-anxiety, general well-being, and levels of loneliness. As climate change progresses at a dangerous rate, it is important to establish and maintain lifestyles that are productive, fulfilling, environmentally conscious, and low in anxiety. Through a better understanding of the interconnected nature of planetary health behaviors with other aspects of healthy living and perception of social isolation, and the effect of an intervention, this research will add to current state of science to help inform the creation of interventions promoting sustainable, healthy, happy living among the general public and specific subgroups.
The aim of this study with three phases is the evaluation of healthy behaviors and its cognitive processes, and anxiety levels in relation to selected physical, mental, and environmental health aspects by means of online survey in (1) general population and (2) rehabiliation setting as well as with (3) an experimental design with students/ see section "Arms and Interventions".
The umbrella terminology of "planetary health" is used in the context of this study. As climate change progresses at a dangerous rate, it is important to establish and maintain lifestyles that are productive, fulfilling, environmentally conscious, and low in anxiety and stress. By evaluating prevalence of healthy behaviors and levels of eco-anxiety as well as loneliness as one early indicator of health risk, this study hopes to build on existing public health knowledge to develop interventions targeting and encouraging multiple aspects of healthy, eco-friendly lifestyles. This study will also help later intervention design by determining effective methods of persuasion and promotion of sustainable planetary health behaviors.
Main research questions are
*Phase 1/general population*
I. Is climate-awareness (in terms of EMCB, YCSCB and Mindful Health) more likely to also increase motivation to promote own health (in terms of physical activity and healthy nutrition)?
*Phase 1/general population*
II. What is the (non-)linear relationship between eco-anxiety and climate-sensitiveness/health behavior?
*Phase 1/general population and Phase 2/rehabiliation setting*
III. Is climate-sensitiveness and eco-anxiety invariant to socio-demographic variables such as clinic, gender, occupation, and age? (No differences)
*Phase 2/rehabiliation setting*
IV. To what extent are pattern in medical rehabilitation different from the general population?
*Phase 3/students and experiment-based*
VI. Does priming eco-anxiety lead individuals to process eco-health-related decisions more deliberately and to make more decisions beneficial to eco-health?
*Phase 3/students and experiment-based*
VII. Is an intervention leading individuals to make more behavioral decisions beneficial to personal and ecological health?
*Phase 3/students and experiment-based*
VIII. Does environmental anxiety induction interact with ROC-T intervention? How does ecological anxiety initiation or intervention effect manifest through changes in the parameters of the drift-diffusion model to reflect changes in the decision-making process?
*Phase 3/students and experiment-based*
IX. Do the observed effects on personal health decisions extend (transfer) to the ecological choice domain?
969 studies on the registry are indexed under Health Behavior; 167 are open to participants now.
This study's enrollment of 1,684 is above the median of 150 across 826 interventional studies indexed under Health Behavior.
Browse Health Behavior studies →Jacobs University Bremen gGmbH is the lead sponsor of 15 studies on the registry; 1 is open to participants now.
Compared within Health Behavior, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Anxiety Disorders. The counts are of registry records indexed under each term, refreshed daily. How we classify →
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Participants viewed a 2-minute climate change video presenting environmental threats to human survival.
Behavioral: Regulation Of Craving Training (ROC-T) · Behavioral: Control group
Participants viewed a 2-minute neutral nature documentary without climate change content.
Behavioral: Regulation Of Craving Training (ROC-T) · Behavioral: Control group
Participants read a 5-minute article on food and ecological health describing the environmental impacts of food choices and actions to support planetary health. During a subsequent choice task, participants received prompts to recall article content and self-monitor their selections.
Control participants read a time-matched article unrelated to sustainability (no multi-domain pro-environmental behaviors including transportation, consumption, and daily activities; just on the beauty of the German nature) and completed the choice task without recall prompts.
Young Consumers' Sustainable Consumption Behaviors (YCSCB) validated scale
The primary outcome measure will be the YCSCB validated scale questionnaire. This will be given to participants right after they have completed the intervention section of the survey. The answering options range from "Never" (0, minimum score) to "Sometimes" (1) and "Often" (2) up to "Always" (3, maximum score). The items are worded 1. I eat meat (steak, ham, etc.). 2. I eat dairy products (butter, cheese, yoghurt, etc.). 3. I keep a healthy diet. 4. There are times when I discard food products. 5. I buy locally grown food products. 6. I reuse my leftovers for the next meal. and items # 1, 2 and 4 need to be reversed, then all items can be used as single items or as aggregated scales, with higher scores indicating a better outcome in terms of planetary health.
Time frame: This scale will take approximately 2 minutes to fill out completely.
Ethically Minded Consumer Behavior (EMCB) validated scale
The second primary outcome measure will be the EMCB validated scale questionnaire. This will be given to participants right after they have completed the intervention section of the survey. The answering options range from "Never true" (0, minimum score) to "Rarely true" (1), "Sometimes true" (2), "Mostly true" (3) and "Always true" (4, maximum score). The items are worded (for instance) 1. When there is a choice, I always choose the product that contributes to the least amount of environmental damage. 2\. I have switched products for environmental reasons. 3. If I understand the potential damage to the environment that some products can cause, I do not purchase those products. ... 10. I have paid more for socially responsible products when there is a cheaper alternative. All items can be used as single items or as aggregated scales, with higher scores indicating a better outcome in terms of planetary health.
Time frame: This scale will take approximately 2 minutes to fill out completely.
Loneliness item from the Center for Epidemiological Studies-Depression-(CES D)-Scale
To study some of the research questions unrelated to the intervention, the perceived social isolation is measured with a standardized scale building on the item in the Center for Epidemiological Studies-Depression-(CES-D)-Scale. The item is worded "How often did you feel lonely?" with the answering options "Daily" (3), "Several times a week" (2), "Once a week" (1) and "Rarely/never" (0). The item can be used as single items, with higher scores indicating a worse outcome in terms of more loneliness.
Time frame: This item will take less than 1 minute to complete.
Plan to share: No — Individual participant data (IPD) will not be published. Other researchers are welcome to get in contact with the PI to get access to anonymous data.
Ran from Dec 2024 to primary completion in Dec 2024, 0 months.
Of 568 non-industry interventional studies with no phase under Health Behavior, half reached primary completion within 15 months of starting (the median), counting those still running; a quarter within 5 and three quarters within 33. This study's 0 months is below that.
Counting every sponsor, half of 586 studies reached it within 15 months; a quarter within 5 and three quarters within 32.
How these figures are worked out, and which studies are left out of them.
This study is completed, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.
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Jacobs University Bremen gGmbH