Snapshot · The Diary Of A CEO with Steven Bartlett
The World Health Organization estimates that 17% of young couples currently need help getting pregnant, up from near zero 15-20 years ago when average sperm counts were still above the 45 million threshold.
Where this was said
At 1:12:50 · chapter starts 1:10:50
Sperm counts have fallen from 180M to 35M units/ml; 17% of couples now need fertility help (up from near zero 15-20 years ago) [1] — Jeremy Grantham "Sperm count: 180M → 35M units/ml: Human sperm count has fallen from an estimated 180 million units per milliliter in hunter-gatherer times …" 1:11:51 . In 20-25 years the average couple will need medical assistance to conceive. Dr. Swan projects median count hits zero by 2045.
Human sperm count has fallen from an estimated 180 million units per milliliter in hunter-gatherer times to just 35 million today, with the rate of decline accelerating at 2.5% per year.
Dr. Shanna Swan's projections indicate that if current decline rates continue, the median male sperm count will reach zero by 2045, meaning the average couple will need medical help to conceive.
Spencer Greenberg and Jeremy Stevenson analyzed almost 500 self-improvement techniques and found they all reduce to just 12 underlying psychological drivers.
Cold exposure has good short-term alertness benefits but the evidence base for long-term health benefits is much weaker than popularly believed.
In a randomized study of 20 habit-formation techniques run on hundreds of people, almost none of the techniques produced statistically meaningful results.
People given a tiny-habit fallback option (e.g. 10 squats instead of gym) were actually MORE successful at completing the full habit, not less.
The most effective habit-formation technique was 'habit reflection' — recalling a past successful habit, writing down what helped, then applying those lessons to a new habit.
A study found that simply scheduling enjoyable activities was as effective as standard cognitive behavioral therapy for depression, leading to its own therapy called behavioral activation.
The 'worry time' technique — deferring all worries to a designated time of day — helps people realize they have more control over worry than they thought and reveals it is less useful than it feels.
A study found that participants told to try to stay awake while in bed fell asleep faster than participants told to try to sleep — illustrating the paradox of direct effort.
Spencer Greenberg reduced his severe social anxiety dramatically in roughly 6 months through a structured exposure therapy hierarchy, culminating in asking strangers for hugs.
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