Dear Sir, We have read Aric A. Prather et al.’s study entitled ‘Tired telomeres: Poor global sleep quality, perceived stress, and telomere length in immune cell subsets in obese men and women’ with great interest. In this study, they aimed to investigate the associations between self-reported sleep duration, measured via daily diary reports, and subjective global sleep quality, assessed using the Pittsburgh Sleep Quality Index, with telomere length in granulocytes, PBMCs and sorted cells (CD4+ and CD8+ T lympho-cytes, and B lymphocytes) in a sample of obese men and women (Prather et al., 2015). When we inspected the article, in the model of the study, the exclusion criteria were as follows: untreated hypothyroidism, use of immunomodulatory medications in the past 6 months (e.g., corticosteroids), being pregnant or planning to become pregnant in the next 12 months, presence of a psychiatric or medical condition that would preclude participation in the group intervention, current bulimia and/or weight loss of 15 lbs or more in the past 3 months, and participation in mindfulness-based therapies in the past 2 months prior to enrollment.
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