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Today’s Health Upgrade

• Answer to yesterday’s “The Catch”

• Number you won’t forget

• Weekly wisdom

• Can a blow dryer cause hearing loss?

The Catch, Answered
Omega-3s and Alzheimer’s Risk

Every week, we feature “The Catch,” where we hide a trivia question in an email and then randomly select and reward those who submit the correct answers. Here’s the answer to yesterday’s question.

The Catch: 64% REDUCED RISK 

A prior analysis of the same dataset used to generate this week's alarming (and misleading) fish oil headlines found that long-term omega-3 supplement users had a 64% reduced risk of Alzheimer's disease.

That number matters because it exposes the flaw in the new study's framing. What the headlines call evidence of harm could simply be a case of reverse causation: people who were already in early cognitive decline were more likely to have started supplementing, not the other way around.

The data shows correlation; it cannot indicate the direction of the arrow. A 2024 review of eleven randomized controlled trials found DHA supplementation showed cognitive benefits in people with early decline, meaning the controlled literature, which can actually establish cause, points the opposite direction from the headlines. Additional research with a different design (and results) would be needed to make the claims that created the viral headlines.

Longevity
Number You Won’t Forget: 1 in 6

There's a version of exercise advice that makes you feel like the only way to see significant changes is to do more. More intensity, more hours, more discipline. 

The logic is basic: If you're not doing something dramatic, why bother? That thinking keeps a lot of people stuck, believing in one of two realities. Either go all-in until burning out, or skip it entirely because modest effort feels pointless.

Depending on your goals, there are thresholds you need to reach to improve your health. But they are not as extreme as some people make them out to be. 

One of the largest physical activity analyses ever conducted found that if people who don't exercise regularly started meeting basic movement guidelines — just 150 minutes of moderate activity per week — an estimated 1 in 6 premature deaths could be prevented.

Researchers from Cambridge and an international team pooled data from 94 prospective cohorts covering more than 30 million people. They mapped the relationship between physical activity and risk of all-cause mortality, cardiovascular disease, and cancer, using data on over 163 million person-years. The numbers are observational, so causation can't be confirmed, but the consistency across dozens of independent studies is hard to dismiss. 

At 150 minutes of moderate activity per week, compared to those who were mostly inactive, participants had a:

• 31% lower risk of dying early

• 29% lower risk of cardiovascular death

• 15% lower risk of cancer mortality 

To some of you, 150 minutes might sound like a lot, until you do the math. That's about 21 minutes a day. A walk before work, a lunch loop around the block, a bike ride on the weekend.

The bar for a meaningful impact on your longevity is lower than most people assume.

The mechanism is multilayered. Exercise improves cardiovascular function, reduces systemic inflammation, and supports metabolic health. And that doesn’t even include the research suggesting how exercise affects biological pathways tied to tumor development. No single explanation covers it all. 

What the researchers did find was that the biggest gains come from going from nothing to something, not from pushing past an already solid routine.

The lesson for you or any friend who has become too sedentary: Start where you are. Even half that amount moves the needle. And anything that moves the needle is an investment in giving your body the movement it needs to live a longer life. 

Mindset
Weekly Wisdom

Most plans never become anything.

Not because they were bad plans. Not because the person behind them lacked talent, or time, or even desire. 

Many good plans stall because starting feels like a commitment to an outcome, and outcomes can disappoint you. Planning never can.

You've probably been here. An idea you care about, sitting in a notebook or a Google doc or just the back of your mind, waiting for the right moment. Waiting until you know more. Until the timing is better. Until you're ready. There's always a reason the first step makes sense tomorrow instead of today.

Here's what that waiting becomes: a way to want something without risking anything.

Goethe understood this. Not as a productivity principle, but as a human truth. The line people skip past is the one that matters most: boldness has genius, power, and magic in it. 

He's not talking about bravado. He's not telling you to be reckless. He's pointing at something almost counterintuitive: the act of beginning is itself a force. It generates things that weren't there before you moved.

The magic isn't waiting for you at the destination. It shows up in motion.

I've watched this pattern with enough people — in coaching, in training, in my own work — to stop being surprised by it. Someone spends months outlining a program they want to build, a habit they want to start, a project they keep calling "almost ready."

Then something pushes them to just begin, imperfectly, with whatever they have. And within weeks, the path looks completely different from what they'd planned — clearer, more specific, shaped by real feedback instead of imagined obstacles.

Turn Wisdom Into Action

You can't steer a parked car. The conditions for clarity are created by movement, not by waiting for clarity first.

This is why starting small isn't settling. It's actually the smarter play. 

The first workout doesn't have to be your best one.
The first draft doesn't have to be the final version.
The first conversation doesn't have to solve everything.

It just has to happen. Because once it does, you're no longer working from imagination — you're working from information.

The fear is understandable. Beginning makes the goal real, which means failure becomes real too. 

Staying in the planning phase is comfortable because nothing can go wrong yet. But nothing can go right yet, either.

Goethe's challenge isn't about being fearless. It's about moving despite the fear. Embracing the boldness. And then seeing the real power that results from taking action. 

Fact or Fiction
Can Your Blow Dryer Damage Your Hearing?

You've probably held it just inches from your ear and thought, even briefly, “This can't be great for my ears, can it?”

A blow dryer is genuinely loud. It sits close to your head. And hearing loss is a growing problem. The logic chain assembles itself without you having to try.

But it goes deeper because readers have written in to tell us that their doctors suggested blow-dryers were a primary cause of hearing loss. 

So we investigated. 

The research suggests that a blow dryer used for approximately 15 minutes a day doesn't come close to the daily exposure threshold at which noise begins causing real hearing damage.

A typical hair dryer runs around 85 to 90 decibels. NIOSH guidelines set the safe daily exposure limit at 90 dB for up to two full hours before meaningful hearing risk accumulates. For the average person drying their hair before work, that gap is enormous. We’re talking about minutes of exposure against an hours-long threshold.

It is true that noise-induced hearing loss is the second most common cause of sensorineural hearing loss globally, affecting roughly 5 percent of the world's population. 

However, the primary driver in your home that puts young people at risk, according to the World Health Organization, is headphones and earbuds, not appliances.

Based on the data we’ve seen, air dryers don't appear to be a meaningful contributor to population-level hearing loss epidemiology among home users.

But that’s not to say the concern is completely fabricated. Professional hairstylists are a different story. In that population, 88 percent report three to four or more hours of daily dryer exposure, with some exceeding eight hours. At those levels, occupational noise-induced hearing loss is documented and real.

It’s possible that the legitimate occupational risk got detached from its context and applied to everyone.

If hearing is genuinely on your mind, the headphones you use deserve more attention. Listening to music or a podcast on high volume exceeds what your morning hair routine produces, and is an adjustment you can make to help protect your hearing. 

And that’s it for this week. Thank you for being a part of the positive corner of the internet. Remember to take action on something this weekend rather than waiting for something good to happen.
-Arnold, Adam, and Daniel

The Positive Corner of The Internet
About Arnold’s Pump Club Editorial Standards

We do things a bit differently here, starting with transparency.

1. The Content: All APC emails are researched, written, and fact-checked by the APC editors (see bottom of the email), with written contributions from Arnold (noted with “Arnold’s Corner”). Links take you to original studies (not second-hand sources).

2. Does AI play a role? Not for the primary content, but it is used in two ways. The main items are original content written by the APC team. The summaries at the end are AI-generated based on the human-written content above. We also use an AI tool to review our interpretations of the research and ensure scientific accuracy. We don’t assume AI is right, but we use technology to hold ourselves accountable.

3. Yes, we have partners (all clearly noted by “Together With”). Why? Because it allows us to keep the APC emails free. We first test products, and then reach out to potential partners who offer ways to help you improve every day. The bar is set high, and to date, we have turned down millions in ad deals. (Example: we will not partner with any non-certified supplements or those without evidence in human trials). If we won’t buy the product, we won’t recommend it to you. And if there’s no evidence it works, then there’s no place for it here.

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Publisher: Arnold Schwarzenegger​

Editors-in-chief: Adam Bornstein and Daniel Ketchell