Table 1 Exclusion criteria in the PREDI-DEP trial

1. Presence of comorbid psychiatric disorders (current mania/hypomania or a history of bipolar disorder, psychosis or schizophrenia, predominant anxiety disorder, primary personality disorder, substance abuse or eating disorder)

2. Suspicion of depression (Score > 18 in Beck Depression Inventory) [16]

3. Participants with severe medical conditions with low survival

4. Participants with history of food allergy with hypersensitivity to any of the components of olive oil or nuts, presence of disorders of chewing or swallowing or a low predicted likelihood of changing dietary habits according to the Prochaska and DiClemente stages of change model [35]

5. Institutionalized patients and those participants who lack autonomy