There is no magic pill, no secret recipe. I eat alot of bad food which would stack kilo's on the average Westerner, but I don't sit on my buttocks all day (except when busy on the computer). Step out of the 4 wheel drive and walk the kids the 500 metres to school.
Burn more calories than what you take in.
In almost all cases, an adult has nobody to blame but themselves for getting fat, and the children can only blame the parents.