Yes, computers can lead to obesity and other health problems, because people need to be active, rather than spend all their time on a computer. If a person has an office job, and then comes home and does nothing but computer, that is a dangerous lifestyle. It is not the computer itself that is the problem, but rather spending too much time sitting down.
Health problems can be accumulated in a number of ways. For example obesity is a combination of unhealthy food and low amount of exercise.
If a computer can distract you for long enough to not exercise and burn calories it is a way to obesity.
If you sit in front of your computer with improper posture for hours daily, it will lead to back problems.
With this logic, anything that can be considered a distraction can lead to health problems.
A computer can lead to obesity as much as a potato chip can.
The longer one sits at a computer, the less the person is out being physical. Too much sitting is never a good thing. It gets worse when you pair with that people's eating and drinking habit's while behind a computer. Only, it is the fault of the computer user and not the computer.
Too much of anything can be a bad thing and computers aren't an exception. If anything, they are the perfect example. People who spend most of their day online are definitely at risk for obesity and other health problems. Carpal Tunnel is one issue that may be faced as well as other muscle pains from being in one position for too long at the computer. People also tend to eat while they are online even if they are not hungry, and the lack of exercise and movement can lead to weight issues.
Because it is their choice to do what the did ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
My impression is that it is the reverse. Obese people need something to do all day while they are sitting around, and being on the computer is only one way they can do it. They could as easily watch TV or nap on the couch, but they could choose to do other things to be more active. You can't blame what is essentially a machine for the choices you make in life.