Lol @ terambulan!!
Lack of exercise and eating too much sugary, fatty food's to blame for a lot of ill health and being overweight. Years ago, people could eat dripping sandwiches and lots of dumpling stews and still managed to keep healthy, but they did more manual work, and women used to chase around after broods of children then and didn't use cars when they went shopping.
The extra sugar, salt and additives in food don't help these days, but if you eat decent food and exercise regularly, most weight-related problems don't exist.