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Environmental changes related to climate change and global warming threaten public health. A 0.5°C change in global surface temperature is projected to cause devastating and irreversible damage to all living things on the planet. If no action is taken against climate change, global surface temperature will increase by up to 2°C compared to pre-industrial levels and continue to threaten human health. The primary culprit for this increase is anthropogenic greenhouse gases, which are responsible for the impact of climate change. With global food systems responsible for substantial anthropogenic greenhouse gas emissions, global water use, and biodiversity loss through land expansion, transitioning to dietary behaviors beneficial to both human and planetary health has become increasingly important. The current climate crisis is compelling societies to change their dietary preferences and behaviors. Environmentally friendly behaviors acquired in childhood help shape environmental self-identity in adulthood and influence sustainable, low-environmental-impact food choices in adulthood. Sustainable and healthy eating habits, compatible with a changing climate, should be adopted from a young age, as healthy eating habits established early in life are an important public health investment for the future of adolescents. During this period, learning about the relationship between environmental sustainability and nutrition can help foster healthier and more sustainable nutritional behaviors. This thesis aims to determine the effects of a sustainable environmentally friendly nutrition educational intervention program on sustainable environmentally friendly nutrition, nutritional attitudes, and nutritional self-efficacy in adolescents. The research will be conducted with 6th and 7th grade students at a public middle school affiliated with the Ministry of National Education in Ankara, using a randomized controlled experimental design. The study sample will consist of 60 students, who will be randomly assigned to a 30-person intervention group and a 30-person control group. The intervention group will participate in a six-week sustainable environmentally friendly nutrition educational intervention program based on Social Cognitive Theory, while the control group will not receive any intervention. Data collection will use a Personal Information Form, the Sustainable Environmentally Friendly Nutrition Scale, the Nutrition Attitude Subscale, and the Child Nutrition Self-Efficacy Scale. Data will be analyzed using the IBM SPSS 27 software package, and differences between groups will be assessed using an independent samples t-test, ANOVA, or other appropriate statistical tests.
Full description
The research will be conducted using a parallel-group randomized controlled experimental design to examine the effects of a sustainable environmentally friendly nutrition educational intervention program based on social cognitive theory on sustainable environmentally friendly nutrition, nutritional attitudes, and nutritional self-efficacy in adolescents.
3.2. Research Location and Characteristics The research will be conducted at a middle school affiliated with the Ankara Provincial Directorate of National Education.
3.3. Research Population and Sample Selection The study population consisted of 6th and 7th grade students attending a middle school in Ankara city center (N=290). A power analysis was performed using the G* Power 3.1.9.4 program to determine the number of participants in the intervention and control groups. Based on the power analysis calculated using Çevik et al. (2024) as a reference, the required sample size was calculated as 54 individuals at an alpha of 0.05 and a power level of 95%. Considering potential participant losses, the sample size was increased by 10% (6 individuals), resulting in 30 intervention participants and 30 control participants, totaling 60 adolescents (Serdar et al. 2021).
Inclusion Criteria
Exclusion Criteria
Exclusion Criteria
• Voluntary withdrawal from the study
3.4. Randomization The assignment of adolescents included in the study to the intervention and control groups will be performed by an independent researcher using a simple randomization method, using a computerized sequence of random integers.
3.5. Prevention of Bias and Blinding To prevent selection bias in the study, adolescents will be randomly assigned to the intervention and control groups using a simple randomization method by an independent biostatistician. Adolescents will be assigned a participant number when the preliminary assessment data is transferred to the computer. The researcher will not know which group the adolescents are in until the study begins. The data will be coded and transferred to the computer without specifying the intervention and control groups. To prevent reporting bias, the study data will be evaluated by an independent biostatistician.
The study intervention will be conducted in the fall semester of the 2025-2026 academic year after ethical approval and institutional permissions have been obtained. Before the interventions are implemented, school administration and teachers will be contacted to inform them about the purpose of the study and the intervention process. An informed consent form will be sent to parents in a sealed envelope through the students. Adolescents who have obtained parental consent and volunteered to participate in the study will be administered a Personal Information Form, the Sustainable Environmentally Friendly Nutrition Scale, the Nutritional Attitudes Subscale (SAT), and the Child Nutrition Self-Efficacy Scale (CSE). It has been reported that the time required for permanent behavioral change in a new behavior is a minimum of 2-3 months (Gardner et al., 2012). In this study, a follow-up test will be administered three months after the training is completed. Data collection tools will be administered before the start of the sustainable environmentally friendly nutrition educational intervention program (pretest), immediately after the completion of the six-week sessions (posttest), and at the end of the first and third month (follow-up). Completing the data collection tools is planned to take approximately 25 minutes. The sustainable environmentally friendly nutrition educational intervention program will last six weeks during the fall semester of the 2025-2026 academic year. Each session will consist of one session per week, covering one module. Each session is expected to last approximately 40 minutes. WhatsApp groups will be established with adolescents/parents to maintain and facilitate communication with adolescents during the intervention. To reinforce the information and practices adolescents learned and implemented during the program and to strengthen the impact of the intervention, the researcher will prepare 12 SMS (Short Message Service) using various sources and send them individually to adolescents/parents. Messages to be submitted for expert opinion will be sent twice a week (12 messages) from the first to the sixth week of the program. Program content is designed to help adolescents achieve their learning goals, in line with the principles of Social Cognitive Theory, and is supported by visual and audio materials. Each module will utilize presentations based on the content, followed by various activities and games to reinforce the topic and support lasting behavioral changes in students.
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60 participants in 2 patient groups
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Data sourced from clinicaltrials.gov
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