Al-Marsad Newspaper: Some studies have warned against consuming grapefruit juice because it causes serious heart problems, because it may also interact with tonic water when consumed by some people.
According to various research groups, mixing grapefruit with tonic water containing quinine – a naturally occurring substance – may produce similar effects, according to Science Direct.
The study stated: People with arrhythmia should avoid consuming grapefruit juice and tonic water together.
And “Medline Plus” warned that this mixture may exacerbate some heart diseases and heart rhythm problems because the juice may inhibit enzymes responsible for metabolizing quinine.
It turns out that the concomitant use of grapefruit juice with quinine may increase the concentrations of the nutrient in the blood, and increase the risk of side effects of quinine.
