On a basic level, many people today interact via social media, e-mail, chat or even posting here rather than face to face. Remote work over the past few years has led to college graduates entering the work force without understanding of how to interact in a business environment, lose out on mentoring from experienced employees, and creating bonds and friendships with the workplace. These life skills are huge and a great loss for many of the current generation. There's less of a need or desire to go outdoors and play as many of us did in our youth. I see many younger kids today who are content to sit inside and snapchat, or post on tiktok, etc... These habits are being learned at a young age and can certainly lead to a more sedentary life style. I agree that all of the things you mention were heading in the current direction well before the internet, but technology and the explosion of social media in the past 15 years IMO has accelerated the problem. Not the cause of the obesity issue but I think it has started to play a role in the overall problem.