Here is the design of a clinical trial:

Official Title: Food for Mind - Group-based Behavioral Nutrition Intervention in the Treatment of Depression

Included conditions:
- Depression

Study Armgroups:
- {'label': 'Food for Mind -intervention group', 'type': 'ACTIVE_COMPARATOR', 'description': 'Nutrition counselling + peer support', 'interventionNames': ['Behavioral: Nutrition counselling + peer support']}
- {'label': 'Befriending group -control group', 'type': 'ACTIVE_COMPARATOR', 'description': 'Social activation + peer support', 'interventionNames': ['Behavioral: Social activation + peer support']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Nutrition counselling + peer support', 'description': 'Behavioral nutrition counselling and peer support, delivered in small groups. Includes six sessions extending over 8 weeks, with participatory activities facilitated by a nutrition therapist.', 'armGroupLabels': ['Food for Mind -intervention group']}
- {'type': 'BEHAVIORAL', 'name': 'Social activation + peer support', 'description': 'Social activation and peer support, delivered in small groups. Includes six sessions extending over 8 weeks, with participatory activities facilitated by group leader.', 'armGroupLabels': ['Befriending group -control group']}

Primary Outcomes:
- {'measure': 'Change from baseline Depressive Symptomatology at eight weeks, 6 months and 12 months.', 'description': 'Depressive symptomatology measured with the Center for Epidemiologic Studies (CES-D) scale at eight weeks, 6 months and 12 months after patient recruitment compared to the social support befriending group.\n\nThe scale has 20 items and measures symptoms of depression. Each item is scored from 0 (zero) to 3 points. The total score ranges from 0 (zero) to 60 points.Higher values of the total score represent a worse outcome.Four of the items (#4, #8, #12, #16) are reversed before calculating the total score. The total score is calculated as follows: the answers to the items are summed, the sum is divided by the number of scored items, and this value is multiplied by 20. If the answers are missing to more than five items, the total score will not be calculated.', 'timeFrame': '12 months: assessed at baseline, at eight weeks, at 6 months and at 12 months.'}

Please estimate the sample size based on the assumption: 
Î±=0.05, power=0.8, estimated loss of participants is 15%
Sample size {14}
        The total sample size of n=144 is based on the power calculation, when Î±=0.05, power=0.8, and effect size=0.5, and the estimated loss of participants is 15%. The calculation is based on the decline of 7 points assessed with the Center for Epidemiologic Studies Depression (CES-D) Scale.