Natural selection operates thanks to two phenomena: heritable variation and differential reproductive success. In that case, we have to assume that the selection is still operating because these two phenomena take place.
Given this, as reproductive success is lower in person who adapt worse to infectious diseases, it could also happen that individuals who have a greater capacity to resist diseases associated with the first world, that is, inactivity, hypercaloric diets and various pollutants, will also be the individuals who are most likely to transmit their genes.
Thanks to technology, many people can continue to survive the diseases that would reduce their reproductive success, but this is not always the case, so the hypothesis that natural selection continues to operate today is plausible, even if it is questioned. In fact, there are studies that point to her.
As one of the year 2009, in which American women who were shorter and more robust had a slightly higher fertility, which suggested that future generations could be lower and chubby if these trends continue for long enough (which is not entirely clear, by the way).
The professor of human evolutionary biology at Harvard University abounds in it Daniel E. Lieberman in his book The history of the human body:
Perhaps natural selection also favors people with genes that help them resist common toxins, skin cancer or other environmental causes of disease. It is also hypothetically possible that genetic screening technologies allow parents of the future to artificially select the characteristics that provide some benefit to their children.
New products and therapies are developed every year that allow people with common illnesses to cope better with their symptoms. The selection that takes place probably does so at a slow pace to measure during our lives. The probability that we evolve deeply is remote, but maybe there are subtle changes over time. After all, in the last 10,000 years, we have evolved faster than in the past.