For many, coffee is a daily ritual, but the health implications of heavy consumption and abrupt cessation can be varied. One individual's personal six-week experiment, detailed in a recent lifestyle article, explored the real-world effects of stopping a daily intake of five to seven strong coffees.
Pre-Caffeine Baseline and Expectations
The author, who consumes a significant amount of coffee daily, initiated the experiment with a baseline health assessment. This included a comprehensive blood test measuring 27 biomarkers, blood pressure checks, cortisol level analysis, and sleep and heart rate tracking using an Oura Ring. Initial readings showed healthy blood pressure (117/78) and a resting heart rate of 65 bpm. Coffee intake did cause temporary spikes in blood pressure to 121/81 and increased resting heart rate to 68 bpm, but these effects quickly returned to pre-coffee levels. The author noted no perceived impact on sleep quality, despite consuming coffee into the evening. Sleep data from the Oura Ring, after a two-week calibration period, indicated an average of seven hours and 40 minutes of sleep per night, with good levels of REM and deep sleep, even after drinking five cups of coffee, the last one at 6 p.m. Cortisol levels were found to be on the lower side in the morning and normalized throughout the day. Stress levels, according to the Oura Ring, were also lower than average. These initial findings led the author to dread quitting, anticipating a shift to "super-healthy status."
The Quitting Process and Unexpected Results
The decision was made to quit caffeine "cold turkey," anticipating withdrawal symptoms such as headaches, fatigue, and irritability. Instead, the author experienced none of the anticipated physical side effects. Baffled by this lack of reaction, a nutritionist suggested genetic testing to understand the body's unique response to caffeine. A DNA test revealed an AA variant on the CYP1A2 gene, which indicates a faster metabolism of caffeine. This genetic factor explained the high tolerance and the absence of jitters, anxiety, or increased risk of hypertension. Additionally, a TC variant was found on the ADORA2A gene, related to caffeine-induced insomnia, but it did not appear to be expressed in this case.
Post-Caffeine Health Markers
As the six-week coffee-free period neared its end, repeat health tests were conducted. Blood tests showed a minor increase in cholesterol, a fractional drop in iron, and a slight rise in vitamin B12. Cortisol monitoring indicated only a minimal decrease. The author's experience contradicted the general understanding of caffeine's effects, with sleep quality actually worsening initially after quitting, according to the Oura Ring data, which recorded a sleep score of 54. Daily stress levels and blood pressure remained consistent. Despite the slight shifts in blood markers, the author concluded that due to their genetic predisposition, there was no compelling health reason to abstain from coffee.
Return to Coffee Consumption
Upon completing the six weeks without coffee, the author resumed consumption, noting the best sleep in ages with a score of 94. This outcome was attributed possibly to the relief of returning to a preferred beverage. While caffeine is not considered addictive in the same vein as nicotine or alcohol, physical dependence and psychological habituation can occur. Experts recommend a general limit of up to 400mg of caffeine per day, roughly three to four barista-style coffees, even for those who metabolize it quickly, as higher intakes are not necessarily more beneficial or risk-free. The author, however, intends to continue drinking coffee liberally, citing personal genetic factors that mitigate common negative side effects.