In a discussion about misconceptions in exercise and health, the speakers, including the author of a book on the topic, debunk common myths about sitting, sleep, and step counts. The speakers clarify that while sitting is natural, it's the uninterrupted sitting that's harmful; frequent breaks can mitigate health risks. They also challenge the notion that eight hours of sleep is optimal, revealing that many people naturally sleep closer to six or seven hours without napping. Additionally, the origin of the 10,000-step goal is traced back to a Japanese pedometer company with no scientific basis, though the number isn't far off from what's beneficial. The conversation also addresses the effectiveness of exercise in weight loss, with an emphasis on the importance of combining exercise with diet for preventing weight gain and maintaining weight loss post-diet. The speakers highlight the interconnectedness of exercise and diet, both of which tend to improve simultaneously and are markers of privilege in modern society.
Gosh, there are so many, I had to actually limit, limit it to ten.
This quote indicates that the speaker encountered a vast number of myths while researching for their book but chose to focus on ten significant ones.
And I think one of the biggest myths out there is that you need 8 hours of sleep a night and that sitting is the new smoking.
The speaker identifies two prevalent myths regarding health practices and questions their validity.
Turns out that all animals sit, right? My dog sits, cows sit, chickens sit, every animal sits, and hunter gatherers also sit.
This quote emphasizes that sitting is a natural and universal behavior among animals and humans, contradicting the idea that it is uniquely harmful to modern humans.
So much how much we sit, but how we sit. So turns out that people who, if you get up every once in a while, right, interrupted sitting is actually much more healthy than non interrupted sitting for the same amount of time.
The speaker clarifies that the key to healthier sitting habits is to take frequent breaks, which can mitigate the negative effects of prolonged sitting.
Just get up every once in a while, just pee frequently, make a cup of tea, pet your dog, whatever.
This quote provides practical advice on how to interrupt long periods of sitting, suggesting that even minor activities can have a positive impact on health.
So this idea that you need 8 hours of sleep has been around for a long time. It's been around basically since the industrial revolution.
The speaker references the historical context of the 8-hour sleep myth, implying that it may not be as firmly based in human biology as is commonly thought.
"And they don't nap. So this idea that natural human beings sleep 8 hours a night is just nonsense." This quote challenges the common belief that 8 hours of sleep is the natural pattern for humans, emphasizing that this is not the case.
"How many hours a night you sleep on the x axis and sort of some outcome like cardiovascular disease or just how likely you are to die, it's kind of a ushaped curve." This quote describes the research findings on sleep duration and health outcomes, indicating that both too little and too much sleep can be detrimental to health.
"So people actually do better if they sleep 7 hours rather than 8 hours." This quote suggests that 7 hours of sleep may be more beneficial than the often recommended 8 hours.
"But basically it turns out that seven is, for most people, optimal." This quote summarizes the finding that 7 hours of sleep is generally the best for health outcomes for the majority of people.
"Teenagers sleep more, older people sleep less. It's complicated." This quote acknowledges the variation in sleep needs across different age groups.
"And they picked out of, just out of the blue, they picked 10,000 steps, because that's apparently an auspicious number." This quote explains the arbitrary selection of the 10,000 steps goal based on cultural beliefs rather than scientific evidence.
"Your average hunter gatherer walks between ten to 18,000 steps." This quote provides context for the 10,000 steps goal by comparing it to the activity level of hunter-gatherers.
"About around 7000, 8000 steps, the curve kind of bottoms out." This quote indicates that the health benefits of walking are maximized at around 7,000 to 8,000 steps per day.
"So it turns out to be not that bad a goal, but it's not a perfect number, like a lot of things, right?" This quote reflects the idea that while the 10,000 steps goal is not scientifically perfect, it is still a decent target for maintaining health.
"One of the biggest debates on the planet." This quote emphasizes the global scale and significance of the debate on exercise and weight loss.
"It has been a huge debate, even on this podcast." This quote indicates that the weight loss debate has been a recurring topic of discussion on the podcast, highlighting its contentious nature.
"Well, anybody wasn't confused, doesn't understand what's going on, right?" This quote implies that the debate is so complex that confusion is a natural and expected response for someone trying to understand the issue.
"But that's how science works, right?" This quote suggests that debate and uncertainty are inherent to the scientific process and contribute to the advancement of knowledge.
"So pretty much every major health organization in the world recommends that you get 150 minutes per week of physical activity. That's what the WHO, the World Health Organization considers the division between being sedentary versus active."
This quote emphasizes the global health recommendation of 150 minutes of physical activity per week as a standard for maintaining an active lifestyle.
"When you walk 150 minutes a week, which is what, 20 minutes a day of walking, which is about a mile a day, you're not going to lose much weight. You're basically burning about 50 calories a day doing that, right?"
This quote highlights the limited impact of walking 150 minutes per week on weight loss, as it burns only a small number of calories.
"The policemen who's kept exercising even after the diet was over, and they went back to eating whatever the hell they wanted. Donuts, whatever. They're the ones who kept the weight off, but the ones who didn't exercise."
This quote illustrates the effectiveness of continued physical activity in maintaining weight loss, even when dietary restrictions are no longer in place.
"Guy named Kevin hall at the National Institute of Health studied them for years afterwards and looked at. And most of them regained a lot of the weight that they lost."
This quote highlights the long-term study of weight regain among "The Biggest Loser" contestants by Kevin Hall, emphasizing the commonality of regaining weight after extreme weight loss efforts.
"And there was one person on the show who did not, and that was the person who kept exercising."
This quote points out that continued exercise was a key factor for the one contestant who did not regain weight, suggesting the importance of physical activity in maintaining weight loss.
"When we talk about dieting, we talk about exercise or diet. Exercise or diet. Like, why is it an or why isn't it exercise and diet?"
The speaker questions why diet and exercise are often considered separately when both are important for weight management.
"Diet is, of course, the bedrock for weight loss. But exercise also plays an important role and should be part of the mix."
This quote reinforces the notion that while diet is critical for weight loss, exercise is a significant component that should not be overlooked.
"Because if I go to the gym, I will not then leave the gym and have a donut or a pizza. Absolutely not. It seems like wasting the effort."
This quote illustrates the speaker's personal experience where exercising discourages them from eating unhealthy foods, viewing it as counterproductive to their efforts.
"The minute I managed to get in the gym and do a big workout the same day, my diet came back."
Here, the speaker shares a personal anecdote that demonstrates how motivation for exercise can directly influence and improve dietary choices.
"And they covary. Right? And that's one of the reasons why when people do big studies, you can look at what people die of, right? What's on the death certificate?"
This quote explains how diet and exercise covary in large-scale studies, affecting health outcomes and making them challenging to study independently.
"However, if you're studying a particular component of a system in a randomized controls trial in a lab, you can separate them out. And so we know that they have independent and also interactive effects."
The speaker indicates that while diet and exercise are intertwined in real-world scenarios, controlled studies can isolate these factors to understand their individual and combined effects on health.