← Home
Feel Better, Live More with Dr Rangan Chatterjee · April 23, 2026 · 16m

BITESIZE | The Truth About Caffeine with Neuroscientist Dr Tommy Wood

Dr. Tommy Wood
Show Notes

A condensed clip from Dr Chatterjee's earlier deep-dive with neuroscientist Dr Tommy Wood on caffeine's effects across energy, focus, sleep, stress, and performance. The episode cuts through common misconceptions by exploring how timing, dose, and individual variation matter far more than simple 'good vs. bad' narratives. Wood offers practical guidance for finding your personal caffeine sweet spot.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Curious

•
Caffeine Doesn't Create Energy—It Masks Fatigue Signals
Caffeine blocks adenosine receptors, suppressing your brain's fatigue signal rather than genuinely boosting energy. This can create a false sense of capability and potentially worsen underlying fatigue.
ClaudeChatGPTGemini
•
Caffeine Can Amplify Stress Hormones in Susceptible People
In some individuals, particularly slow metabolizers or those under chronic stress, caffeine elevates cortisol and norepinephrine, amplifying anxiety and stress perception even at moderate doses.
ClaudeChatGPTGemini

Highlights

•
Caffeine Timing Matters More Than Total Dose
When you consume caffeine matters more than how much—taking it too late in the day can disrupt sleep even if the amount seems 'safe,' and timing it strategically can enhance focus without the energy crash.
ClaudeChatGPTGemini
•
Individual Caffeine Sensitivity Varies Dramatically Due to Genetics
Genetic variations in caffeine metabolism (primarily CYP1A2 enzyme activity) mean some people are 'fast metabolizers' while others are 'slow metabolizers'—explaining why one person thrives on 400mg while another crashes on 100mg.
ClaudeChatGPTGemini

Editorial

•
Caffeine Isn't Simply 'Good' or 'Bad'—Context and Individuality Trump Universal Rules
The science of caffeine has moved beyond simplistic 'avoid it' or 'drink more' advice. Dose, timing, genetics, stress levels, sleep quality, and goals all interact—what works for one person is harmful for another.
ClaudeChatGPTGemini

Misc

✧Bitesize format—repurposed from a longer 2-hour conversation (episode 404), suggesting high listener demand for caffeine clarity
Was this useful?