You've Got Rhythm - Coffee, caffeine, And Your Body - Dr. Thomas Merritt
Coffee sits at the intersection of evolution, neuroscience, metabolism, behavior, and public health. In this episode, Balint of SciAnts_Streams speaks with Thomas Merritt about what coffee research reveals—and what it still cannot explain.
Dr. Merritt uses coffee as an entry point into larger scientific questions surrounding experimental biology and human physiology. The discussion examines evidence linking moderate morning coffee consumption with improved health outcomes, while highlighting the challenges of interpreting observational studies and distinguishing correlation from causation. The conversation explores conflicting findings surrounding caffeine and cortisol, the complexity of metabolic research, and the importance of individual biological variation.
Listeners are taken through the biology of caffeine itself, including tolerance, withdrawal, placebo effects, circadian rhythms, and the physiological differences between coffee, tea, energy drinks, and decaffeinated beverages. Dr. Merritt argues that many discussions about caffeine overlook a simple reality: caffeine is a drug, and understanding its effects requires understanding dose, timing, and context. The episode also explores one of evolution's most intriguing recurring inventions.
Caffeine evolved independently in multiple plant lineages, producing the same molecule through different evolutionary routes. That convergence raises a fundamental question: what selective advantage made caffeine worth inventing again and again? The answer remains unresolved, providing a powerful example of how much remains unknown even about familiar substances consumed by billions of people.
Part science discussion, part coffee deep dive, and part lesson in how scientific evidence is interpreted, this episode demonstrates why biology rarely offers simple answers—and why that complexity is often where the most interesting discoveries are found.
Recorded 5/10/26
Doctor Merritt Resources:
Link Tree: https://linktr.ee/merritt_lab
Biography: https://laurentian.ca/academics/facul...
ORCID: https://orcid.org/0000-0002-4795-7534
Google Scholar: https://scholar.google.com/citations?...