I think it is important to diffirentiate between people who are born with overweight body and cannot do anything with it and people who would have normal weight but are gaining it because of unhealthy food or lifestyle. Sadly, the page doesn't have such a table.
Yes, I don't know if it is checked scientifically, but people have different figures. If we take several people of the same height and age and will give them the same food and the same amount of physical load, they still will have different body mass.
