Reacción a "Incidence of colon cancer continues to rise in young people in many high-income countries, although not in Spain"

It is a very interesting and high quality article. It situates very well how the much debated topic is in its real quantitative framework in different countries. The strong aspects of the article are that it is based on population incidence data in quality cancer registries and with a sufficient period of time in the analysis. The data observed confirm that this increase in cases is not observed in Spain, confirming previous observations.   

An important fact is that Spain is among the countries with the highest incidence in the world in people over 50 years of age, behind only the Netherlands, Japan and Denmark.  

As to why the increase [in young people] that is observed in other countries (but not in all of them, far from it) is not observed in Spain, it is difficult to propose an explanation. One explanation would be that our incidence will increase in the coming years and there is simply a time lag. Clearly this phenomenon affects population cohorts born later than the 50s/60s of the last century, and it is difficult to think that changes in diet and physical exercise are so different from other countries around us. Therefore, we should be vigilant in case the trend finally changes in the future and try to promote healthy habits that we have been progressively losing, such as eating healthily, without being overweight or obese. And doing moderate but constant physical exercise.