Pretty obvious really. My Paternal grand-parents ate well - a lot of stodgy foodstuffs but they also had a LOT of exercise - from the age of 4 Grandma walked 4 miles to school in the morning, had a sandwich of pork dripping and a bottle of cold tea for lunch - then back 4 miles at night. They used a lot of suet in cooking. Keeps the body warm.
She died aged 86 from what I believed to be a stroke but on the Death Cert. is was something more complicated but rarer
Grandad died from lung cancer ......... aged 71
My Maternal Grand-parents ate less well but still grew their own, raised chickens/rabbits etc. for the table. She died aged 86 from bile duct cancer and he from pneumolcylicosis probably - he was a baker. Aged 55.
I think what we eat and GOOD exercise is important. Refined sugars and fats cause the body to layer fat which can affect the internal organs. Out of sight, out of mind