The worst traffic in my city is when parents are driving their kids to school. We used to walk or bike, or take the bus, back in the day.

Agree though that low quality highly advertised and addictive high sugar junk food is probably the major factor. Junk food needs to be taxed to pay for the obesity and illnesses it results in.

It is now a more serious and expensive threat to health than smoking. Tax junk foods at a similar rate to tobacco - but good luck with that, given the power of the junk food lobby.