Training in the afternoon or evening burns more fat than in the morning, and consuming caffeine before exercise amplifies this process to the point that a morning workout with caffeine is equivalent to an afternoon workout without caffeine.

noli's read

The cited study (PMID: 33413459), a randomized controlled trial (RCT), effectively confirms that fat oxidation is higher in the afternoon than in the morning, regardless of caffeine. Research shows that caffeine increases lipolysis (fat mobilization) at any time of day, which supports the idea of a cumulative effect. However, the claim that morning caffeine perfectly 'equates' to afternoon results is a simplified interpretation: while caffeine boosts morning oxidation, the circadian rhythm specific to the afternoon remains physiologically dominant for fat metabolism. The study highlights an interesting synergistic effect, but individual variability and exercise intensity play an equally crucial role. It is therefore accurate to note a trend favoring the afternoon, but it is an exaggeration to present this equivalence as a fixed rule applicable to everyone. Science validates the influence of timing, while remaining nuanced about the actual magnitude of these benefits in daily life.

the sources

1. 1Hackett D, Hagstrom AD 2017
2. 2Vieira AF, Costa RR, Macedo RCO, Coconcelli L, Kruel LFM 2016