Well, I don’t know much about east indians.
But I have known easily over 100 90+ year olds and none of them ever in their lives did ANY of the things that supposedly help you live longer (exercise, vegatarian, ect)
They were all just normal people, living normal lives, most were gardeners and liked working with their hands type jobs
If all this excercise hype were true, then the ranks of the elderly would be filled with body builders and athletes and health food nuts.
The fallacy in your thought is that those who lived to be 90+ did not experience prolonged overabundance of both food and leisure/sedentary lives.
The diabetic epidemic if there is one is experienced by the children and grand children of those of whom you speak.
Their lives were more like humans of old who lived lives requiring more exercise just to live and who did not have Doritos or all the chicken and meat and fries and..... they could want. The problem with abundance is that it is contrary to the genetic programming of tens of thousands of years of evolutionary biology.
My FRiend, I can guarantee you, that those 90+ year olds didn’t have to “do” any exercize, because their life WAS full of exercise! We need to to exercise today because our lifestyles are sedentary compared to those of yesterday.
Exercise helps one live longer in a few ways.
1. A fit person is more mobile than an unfit person, which leads to his ability to be more independent longer.
2. Exercise helps keep the blood vessels clear, which contributes to less chances of heart attacks or strokes.
3. Prevention of falls. A person who has eaten well and exercised throughout his life will have stronger bones. It is my understanding that the biggest contributor to removing a senior’s ability to live a long life is falling and breaking their hips. Most don’t recover when they’ve suffered that sort of injury.
In short, exercise may not be a big factor in being able to live to 100, but it certainly contributes to an enjoyable life up until the moment of death.