I heard a lot of benefits to drinking grapefruit juice on a daily basis - from enhancing caffeine to magically eating away fat....does anyone have any hard evidence/studies supporting any of this?
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According to this article from the British Journal of Clinical Pharmacology, grapefruit juice prolongs the systemic elimination half-life of caffeine, i.e. the caffeine stays in your system for longer.
This article supports the claim that grapefruit products promote weight loss. It also says that grapefruit products improve insulin resistance in people with metabolic syndrome.
It's worth noting that grapefruit juice can have dangerous interactions with a number of drugs, so make sure you double check the safety information of any drugs you take before using grapefruit juice for its "magical" properties.