Research
Hormonal
Caffeine and methylxanthines stimulate adipocyte lipolysis by antagonizing A1-adenosine receptors and inhibiting phosphodiesterase, thereby increasing intracellular cAMP levels.
Consuming caffeine or methylxanthines can boost fat breakdown by blocking adenosine signals and preventing cAMP breakdown. This increases free fatty acids in the blood. While it contributes to fat oxidation, it is not a magic bullet and works best alongside energy deficits.
GoodSupportsHIGH confidence
The well-known lipolytic effect of caffeine and other methylxanthines occurs by elevating the cyclic AMP (cAMP) intracellular levels by two mechanisms. On the one hand, this is through A1-adenosine receptor antagonism, leading to a reduction of adenylyl cyclase activity and subsequent increased lipolysis. On the other hand, methylxanthines further prevent the breakdown of cAMP by inhibiting phosphodiesterase activity.
Why this rating
The paper is a comprehensive review citing multiple studies on caffeine's mechanism and effects.
Source
Regulation of adipocyte lipolysis
Gema Frühbeck et al. · Nutrition Research Reviews · 2014
DOI 10.1017/s095442241400002x
narrative_reviewCited 427×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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