I've known many old people. Family, neighbors, church people, etc. Do you actually think people in their 80's and 90's are all eating steamed vegetables and skinless chicken breasts?
Then you should publish a peer reviewed study based on your very scientific observational data. Look around. There is an increasing worldwide epidemic of obesity and type 2 diabetes, including Lean Diabetes, even in countries like China and India. It's no longer First World problem.