A Reversal Study on the Effects of Change to Filtered Coffee on Serum Cholesterol Levels

  1. Jesús Gil Roales-Nieto
  2. Emilio Moreno San Pedro
  3. Ana Gil Luciano
  4. José Luis Blanco Coronado
Revista:
International journal of psychology and psychological therapy

ISSN: 1577-7057

Año de publicación: 2019

Volumen: 19

Número: 3

Páginas: 291-310

Tipo: Artículo

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Otras publicaciones en: International journal of psychology and psychological therapy

Resumen

olume 19, 3, 2019. To be published October 1st 2019 Unfiltered coffee consumption has been associated to the increase in serum cholesterol levels. The aim of this population study was to verify if the change in the type of coffee consumed from unfiltered to filtered produces effects on the serum cholesterol levels of the participants. The sample was formed of 30 volunteers (9 men) with no health problems (age range= 18-47; average= 28.2; SD= 8.8). The study was structured according to an A-B-A reversible design with simultaneous replications between subjects. During the Baseline and Reversion phases (A), participants consumed unfiltered coffee in their usual way, while in the Intervention Phase (B) they consumed only filtered coffee. Participants were divided into two subgroups according to their serum level of cholesterol LDL at Baseline Phase (resulting in a subgroup formed by 16 participants with LDL <115 mg/dL, and a subgroup formed by 14 participants with LDL ≥115 mg/dL). Results indicated that 90% of participants showed decrease in their serum cholesterol LDL level at the end of the Intervention Phase contingent to coffee change with an increase in their serum cholesterol LDL level at the end of the Reversion Phase when they returned to consuming unfiltered coffee. Also a change in serum cholesterol HDL level was shown by 93% of participants, with an increase in serum cholesterol HDL level contingent on the change to filtered coffee and a decrease when they return to consume unfiltered coffee. The implications of these findings and the limitations of the study are discussed.

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