Summary
Professor Tim Spector shares the seven health habits he's changed his mind about in 2026, including his revised stance on vitamin D and sunlight. He walks through new evidence on supplements, exercise, sleep, oral health, and the microbiome, explaining how he decides when research is strong enough to actually change his behavior.
Key Points
- Tim Spector revised his stance on vitamin D supplements -- the evidence for routine supplementation in non-deficient people is weaker than he previously believed.
- Sunlight exposure delivers benefits beyond vitamin D (nitric oxide release, circadian regulation) that supplements cannot replicate.
- Creatine is one supplement Spector has added to his routine based on emerging evidence for muscle preservation and cognitive health in aging.
- Resistance training is now prioritized alongside cardio after evidence showed muscle mass is a stronger predictor of longevity than aerobic fitness alone.
- Nasal breathing during sleep (via mouth taping) improved his sleep quality, aligning with evidence on airway health and oxygen saturation.
- Changing health habits requires a high evidence threshold -- Spector waits for converging data from multiple study types before modifying his behavior.
Key Moments
Tim Spector more convinced than ever that gut microbiome is the foundation of health
After reviewing the latest evidence, Tim Spector says he is more convinced than ever that the gut microbiome is crucial for overall health, and that if you have a healthy gut microbiome, pretty much everything else follows. The continually accumulating evidence keeps reinforcing this view.
"Well, I'm still very convinced more than ever that the gut microbiome is crucial for our overall health. And if we have a healthy gut microbiome, pretty much everything else follows."
The gut-brain connection is the most exciting developing area of nutrition science
Spector identifies the gut-brain connection as the most exciting developing area of nutrition science in 2026, noting that much of this emerged unexpectedly from ZOE research studies. The bidirectional communication between gut microbes and the brain is proving far more significant than previously understood.
"I'm really into the brain and the gut brain connection, I just think is absolutely fascinating. And a lot of that has come out of the Zoey studies that have pointed in that direction there is we didn't think about when we started Zoey."
Poor sleep is equivalent to two double gin and tonics for brain function
Spector reveals that sleep has moved into his top three health priorities alongside exercise and diet. A poor night of sleep impairs brain function equivalent to having consumed two double gin and tonics, and it is critically important for age-related health.
"A poor night's sleep is equivalent to working, having had two double gin and tonics."
Tim Spector remains skeptical of creatine for cognition — waiting for stronger evidence
Despite the growing hype around creatine for brain health, Spector says he will not bother supplementing until studies definitively show cognitive benefits, reflecting his evidence-based approach of waiting for robust data before adopting a new supplement.
"So until they show that creatin really has a definite benefit on cognition, which is suggested it might do, I'm not going to bother."
