Paleo Diabetic

Myopia, aka nearsightedness, is extremely common and can start in childhood or young adults. I myself have had to wear glasses since ~age 9, when I was astonished to see individual blades of grass and leaves on trees. Myopia over time it can lead to early-onset cataract, retinal detachment, and glaucoma. MedPageToday has an eye-opening article on treatments that can prevent myopia progression and complications. For example:

Common evidence-based treatments that offer both statistically significant and clinically meaningful efficacies include daytime multifocal soft contact lenses (MFSCL), overnight orthokeratology (ortho-k), and topical low dose atropine (LDA). Novel spectacle lenses also showed a promising myopia-inhibiting effect, albeit with limited availability in U.S. at the current moment. On average, these options slow myopia progression by 30-70%compared to conventional single vision glasses or contacts. With properly selected early interventions, not only the development of myopia stabilizes at younger ages, the endpoint of the progression is also much lower, resulting in significantly lower risk of complications. Furthermore, with lower level of myopia at stabilization, many myopic patients could be good candidates for refractive surgery with given corneal thickness.

I get the impression from the article than treatments need to be started in childhood.

Steve Parker, M.D.

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From The Lancet Neurology:

Prospective epidemiological studies in industrial societies indicate that 7 h of sleep per night in people aged 18 years or older is optimum, with higher and lower amounts of sleep predicting a shorter lifespan. Humans living a hunter-gatherer lifestyle (eg, tribal groups) sleep for 6-8 h per night, with the longest sleep durations in winter. The prevalence of insomnia in hunter-gatherer populations is low (around 2%) compared with the prevalence of insomnia in industrial societies (around 10-30%). 

Fun fact: Adult horses only sleep for 3-5 hours per day. And in a herd, there’s usually one “standing watch” for predators while the others sleep.

Steve Parker, M.D.

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…based on analysis of zinc isotopes in a tooth sample from the Iberian peninsula.

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Steve Parker, M.D.

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Ilana Mercer reminded me that testosterone levels in men have been falling for the last several decades. It’s unclear why. May be related to pollution, overweight and obesity, or decreased incidence of smoking. Not mentioned by Ilana is the dramatic drop in sperm counts.

From Ilana:

It is very possible, even likely, that the feminization of society over the past 20 to 30 years is changing males, body and mind. It is very possible that the subliminal stress involved in sublimating one’s essential nature is producing less manly men.

Consider: When they are not twerking tush with transexuals, today’s tykes are required to hack their way through page-turners like One Dad Two Dads Brown Dad Blue Dads. Boyhood today also means BB guns and “bang-bang you’re dead” are banned.

Boys are hardwired for competition; the contemporary school enforces cooperation. Boys like to stand out. But team-work obsessed, mediocre, mostly female school teachers teach them to fade into the background. Boys thrive in more disciplined, structured learning environments; the American school system is synonymous with letting it all hang out.

Sons are more likely to be raised without male mentors, since moms, in the last few decades, are more inclined to divorce (and get custody), never marry, or bear children out of wedlock. The schools have been emptied of manly men and staffed by feminists, mostly lacking in the Y chromosome. Although boys (and girls) require discipline, the rare disciplinarian risks parent-driven litigation.

Steve Parker, M.D.

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No, according to these three credentialed experts at The Conversation. A snippet:

There is a common belief that “good” posture is important to protect the spine from damage, as well as prevent and treat back pain. Good posture is commonly defined as sitting “upright”, standing “tall and aligned”, and lifting with a squat technique and “straight back”. 

Conversely, “slump” sitting, “slouch” standing and lifting with a “round back” or stooped posture are frequently warned against. This view is widely held by people with and without back pain, as well as clinicians in both occupational health and primary care settings

Surprisingly, there is a lack of evidence for a strong relationship between “good” posture and back pain. Perceptions of “good” posture originate from a combination of social desirability and unfounded presumptions.

Click for more of my blog posts on low back pain.

Steve Parker, M.D.

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