Today’s story comes from the Good News Network.

If the man on the street had to guess the best metric for healthy aging, they might say blood pressure, cholesterol levels, lean muscle mass, blood triglycerides, or even telomere length if they follow aging science closely.

But it turns out that one of the best is grip strength. According to Joshua Davis at the University of Derby, UK, this relatively underdeveloped conditioning area is increasingly recognized as one of the most reliable markers of human health.

Grip strength is associated with positive health outcomes, whether measuring for diabetes risk or depression, and you don’t need any expensive equipment to measure it. Davis recommends you simply pop the top off a can of tennis balls.

“Being able to maintain a maximal squeeze on something like a tennis ball for 15-30 seconds would be a good standard to strive for,” Davis told the BBC.

It’s not necessarily the case that being the one in the house whose hands are the most capable of opening a stubborn pickle jar means you’ll live the longest. Instead, it’s the case that grip strength is an efficient proxy for total muscle conditioning, which is itself an excellent proxy for overall nutrition, physical activity, and disease profiles. In other words, it’s a proxy for a proxy.

For example, the BBC report cites one study that found grip strength to be an effective predictor of sarcopenia, the decline in muscle conditioning associated with aging, strongly correlated with mortality. Another study found that of those in middle age who had their grip strength measured in 1965, the ones who lived to be 100 were 2.5 times more likely to have had grip strength results in the highest third.

Yet another paper found that grip strength has a prognostic value for human longevity that exceeds blood pressure, one of the vital signs controlled for in every hospital patient.

It’s almost certainly not the case that developing grip strength alone will protect against disease and early mortality; as mentioned above, it’s a proxy for overall muscle conditioning.

There’s an old saying in medicine: “Break your hip, die of pneumonia.”

Muscle mass is one of the best defenses against the ravages of age. It cushions the joints and bones and provides protection from falls and the subsequent fractures that gave rise to this ghastly adage. It also soaks up excess glucose in the blood to reduce the risk of developing type 2 diabetes or insulin resistance.

The BBC also spoke with Mark Peterson, a physical medicine and rehabilitation professor at the University of Michigan. Peterson conducted a 2022 study that found that deep down in our DNA, patterns of methylated molecules in those with weak grip strength indicated they were aging at an accelerated rate.

If you don’t have a grip dynamometer to measure precisely how much force your handshake can exert, you can always perform the tennis ball test.

The good news in this article is not the grip as an indicator of overall health, but the idea of the benefits of continuing exercises to maintain muscle mass. Is it worth it? Yes. Today’s JohnKu talks about health. I hope you have a wonderful weekend.

Our Future by John W. Howell © 2025

When it comes to health,

We are in charge of our own. . .

Don’t stop exercise.

Today’s good news story comes from the Good News Network.

No AC Needed in India’s Heat: Inside Gujarat’s Eco-Friendly ‘Cool House’

Western India is home to one of the hottest deserts on Earth, and the residents of the western states of Rajasthan and Gujarat have traditionally used architecture to keep cool.

Utilizing principles of thermodynamics, one house in the city of Bharuch, where temperatures can hover at 110°F for days during the summer, stays cool all day and all summer without ever needing the air conditioning switched on.

In fact, the building’s interior is a breezy, green, “introverted space” that passively cools the air inside by a whopping 18°F, all using simple science.

“We used the direction of the winds, design, and cooling materials to lower the heat of the house,” Samira Rathod, the principal architect of the ‘Cool House’ and founder of Samira Rathod Design Atelier (SRDA), told The Better India, reporting on the story.

“The plot had three buildings around it and a road on one side. The only view that the house would have was the neighbor’s building. An introverted house was a good choice in that sense. It is basically one where the house opens up when you go inside it. It would look like a rather closed structure from the outside,” she explains.

Indeed, it might even be called depressing, as its front door is hidden between two giant, 18-inch-thick facades of gray and black. But inside, a design reminiscent of a railroad track sees the rooms divided on either side of a giant split in the house, built to align with the current of the wind off the ocean.

Bharuch is situated on the Indian Ocean, and despite the scorching temperatures, a breeze is present throughout much of the city at various times during the day. The narrow slit in the house leverages the Venturi effect, which states that the narrower the space an element must pass through, the faster and colder it becomes.

The principle can be seen in human breath, which emerges hot through an open mouth but cool through pursed lips. The same effect can be seen in rivers, where narrow channels cause the water to speed up and form rapids, while wide, flat lands cause the water to slow down.

The wind from the sea enters the split and hits an interior courtyard where a pool of water cools it down further. Entering the 10,500 square foot home interior, a second courtyard aids in circling it around each room, where the family lives with three generations.

“The house looks inwards and we have created courtyards with trees so it feels like you are looking outside rather than inside,” said Rathod.

GNN has previously reported on Indian architecture in this part of the country. Natural designs like envelopes, air channels, and even “wind towers” could, and probably should, become standard designs in parts of the world where temperatures are predicted to rise, such as the southwest United States or Southern Europe.

In Rajasthan’s city of Bhilwara, a “House of Arches” ensures that no part of the building is exposed to the sun thanks to a building envelope that provides shade and air circulation.

The science lies in the separation of the envelope from the house itself. Even as the sun’s rays heat the envelope, wind and moisture evaporation can penetrate the space between the house and the envelope to reduce the radiant heat that enters the living areas.

The good news in this story is that it is possible to engineer structures with features that can reduce the need for electricity for cooling. Today’s JohnKu talks about new thinking. I hope you have a lovely weekend.

Progress by John W. Howell © 2025

Demand reduction,

May be the solution at hand . . .

To solve climate change.