Transcript: Kiwifruit for Insomnia
The number one question in sleep research is why do we sleep, followed by the question “How much sleep do we need?” After literally hundreds of studies we still don't know the best answer to either question. A few years ago I featured a large hundred thousand-person study suggesting that "Both short and long sleep duration were associated with increased mortality, with people getting around 7 hours of sleep living longest. Since then a meta-analysis of all such studies including more than a million people was published, and they found the same thing. We still don't know, though, if sleep duration is a cause, or simply a marker of, ill health. Maybe sleeping too little or too long does make you unhealthy, or maybe we see the associated shortened lifespan because being unhealthy causes you to sleep shorter or longer.
Similar work has now been published on cognitive function. After controlling for long list of factors, men and women in their 50s and 60s getting 7 or 8 hours appeared to have the best short-term memory, compared to those that got much more or much less. Same thing was just demonstrated with immune function: "both reduced and prolonged habitual sleep durations were associated with an increased risk of pneumonia.”
It's easy to not get too much sleep, set an alarm. But what if you're having problems getting enough? What if you're the 1 in 3 adults that suffers symptoms of insomnia? Sure there are drugs like valium you can take for insomnia in the short term, but they have a number of adverse side effects. Non-pharmacological approaches such as cognitive behavioral therapy are often difficult, time-consuming, and don't always work. Wouldn't it be great to have "natural treatments that can improve both sleep onset and help patients improve the quality of sleep while improving next-day symptoms over the long term?
The "Effect of kiwifruit consumption on sleep quality in adults with sleep problems." Two kiwi fruit an hour before bed every night for four weeks. Why study kiwifruits? Well, people with sleep disorders tend to have high levels of oxidative stress so maybe antioxidant rich foods may help, but all fruits and vegetables have antioxidants. Well kiwifruits contain twice the serotonin of tomatoes, but it shouldn't cross the blood/brain barrier. Kiwifruit has folate, and a deficiency might cause insomnia, but there's a lot more folate in some other plant foods. The reason they studied kiwifruits is because they got grant money from a kiwifruit company, and I'm glad they did because they found some really remarkable results: Significantly improved sleep onset, duration, and efficiency using both subjective and objective measurements. Went from sleeping 6 hours a night to 7, just eating a few kiwifruit.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video. This is just an approximation of the audio contributed by Ariel Levitsky.
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