A suburban market near Florence, Italy, a few days ago. This market is frequented only by local residents and it provides good evidence that the Italians, on the average, are not so fat. Most people you see walking there are in reasonably good shape and I tried hard to find someone truly obese, but I didn't see a single one. It turns out that, indeed, Italy is less affected by obesity than most (although not all) countries of the Western World. But things are rapidly changing; Mediterranean diet notwithstanding, even in Italy people are more and more gaining weight and becoming obese. The obesity epidemic seems to be another one of those problems that keep getting worse and that we just don't know how to solve.
We all know that the world suffers an obesity epidemic, hitting in particular the rich countries of the West. But what exactly makes people fat? You could say that it is because they eat too much and exercise too little and that would be, obviously, true. But should fat people be
There is more to say about the damage done by the modern,
But there may be more to this story if we consider the situation from a "systemic" viewpoint. Human beings are complex systems and complex systems are known to react in a non-linear manner to external forces. So, facing an obese person, if you are thinking in terms of systems, you won't just say "this person eats too much". Rather, you would ask, "what could have unbalanced the metabolic homeostasis of this person?"
To illustrate this point, let me compare the obesity epidemics to climate change (that we could call a "high temperature epidemic"). The Earth's atmosphere is a typical complex system that reacts in a strongly
Note how all it takes is a small increase in CO2 concentration (little more than a hundred parts per million) to generate a major change in the atmospheric temperatures. It is a point that many people find difficult to understand; not unexpectedly because we are not used to think in systemic terms. But even a small change in the complex atmospheric system can generate a cascade of reinforcing feedbacks that create the disaster we call "climate change." That's the way complex systems work.
Now, could it be that something similar is taking place with the obesity epidemic? Could there be a single agent, or, anyway, a main one, that triggers a cascade of reinforcing metabolic feedbacks that turn normal human beings into land whales?
It can't be excluded, but identifying such a substance, if it exists, is a major - nearly impossible - task. A recent review by Simmons et al.
The sheer number of possible culprits makes one's head spin. But, in a sense, that can be seen also as promising. What if one of these chemicals plays the role of CO2 in the atmosphere? That is, could one of them be the main trigger of obesity? It would be great if we could point to a specific substance and say: "Look! This is the stuff that makes people obese! Stop putting it into the food we eat!" And, from then on, we would see no more land whales in shopping malls.
Unfortunately, things are not so simple. As I said, the human metabolic system is much more complex than the climate system and, therefore, it is hard to identify such a substance, assuming it exists.
And, finally, even if we manage to have scientific proof that a specific substance is the main cause of obesity, we would likely see the food industry gearing up for a major denial campaign. It is easy to imagine politicians stating, "Look, I am not a scientist, but I believe that there is no proof that
In the end, it seems that the problem with obesity is the same we have with other
Let me conclude, however, with a note of optimism (of a sort). Obesity has the advantage over climate change that people can experiment with it by themselves. So, a lot of different diets are being tried, from Vegan to Paleo, and everything in between.
h/t Roberto Rondoni