Heroes Not Zombies

In New Scientist, 8 November 2025, Graham Lawton wrote an article entitled “Older Faster”. He describes the difference between biological age and chronological age. Biological age is an estimate of your fitness, your wellbeing, based on how well your cells and systems are functioning. It’s closely related to inflammation. The more inflammation in your body, the faster it ages, and the more likely you are to suffer from pretty much any chronic illness. The phenomenon he describes is that, globally, we humans are ageing faster than we used to. 

There seems to be a strong correlation between obesity and biological ageing, and as we are seeing an obesity pandemic it’s no surprise that people are ageing faster too. But does the one cause the other? Are people ageing faster because they are more obese? Or are they becoming obese because they are ageing faster? 

These two statement shocked me – “Cancers are increasing in younger age populations, people under 40 years of age have more heart attacks, more diabetes” (social epidemiologist, Paulina Correa-Burrows) and “Cancer used to just be considered a disease of ageing. Now people are being diagnosed with colon cancer in their 30s, breast cancer in their 30s. Why is that? Perhaps some of the processes of ageing are acting earlier and causing ageing to accelerate, which then causes early onset cancer” (Jennifer Guida)

A study of 150,000 people whose blood samples were stored in the UK Biobank, revealed that those who were born after 1965 were “17 percent more likely to show signs of accelerated ageing than the older ones, born between 1950 and 1954” They also found this accelerated ageing caused an increased risk of early onset cancers of the lungs, gastrointestinal tract and uterus. 

The author argues we seem to have created an “obesogenic environment” in the world, and proposes that because this is correlated with accelerated ageing, we use the term “senesogenic environment” – an environment which is causing us all to age faster. 

Obesity rates in 5 to 19 year olds increased 1000 percent between 1975 and 2022, and it continues to rise. Something has changed. It’s still not clear exactly what, but one theory is excess calories, which seems to cause both obesity and accelerated ageing. In fact, calorie restriction activates body repair processes and slows ageing. 

However, we do know that it isn’t all down to calories. Stress hormones play a significant role. And, although, Graham Lawton doesn’t cover this aspect, poverty, job insecurity, social insecurity, poor housing, as well as environmental pollution from microplastics to cocktails of “forever chemicals”, and poor air quality, all increase the levels of stress hormones in our bodies. 

Rather, he concludes with the typical medical individualist approach and asks what we can do as individuals to slow down this biological ageing – exercise, calorie restriction, good sleep hygeine and the avoidance of alcohol and smoking, are the usual suspects. He mentions the benefits of GLP-1 agonist injections (like Ozempic) but concludes “time to lose weight and get active again”. 

That’s kind of a disappointing end to the article, because what interested me more was this concept of a “senesogenic environment”. Shouldn’t that be at the heart of government policies, not just on health, but on economics and the political choices we are making? If we want to tackle obesity the answer won’t lie in the next “miracle drug” (why do miracle drugs always turn out to be not quite so miraculous as time goes on?), but in a shift of focus towards the senesogenic environment, and that’s going to involve Public, collective, political and economic policies to reduce poverty and insecurity, to provide decent housing for all, accessible health care and education for all, and by cleaning up the air, water and soil by clamping down on chemical and plastic pollution.

This senesogenic environment isn’t natural. It’s created by political choice, putting the wishes of corporations and the rich over our common, shared needs. And by “our” I mean, not just we humans, but we living creatures of all kinds on this little spinning planet.