I once went to a footwear shop with a friend who wanted to buy a pair. We were looking at the footwear on display when the shopkeeper came along and started talking to us. The shopkeeper looked at my friend who was short and thin and said that the footwear would last a long time on him since he was of lower weight. He said the footwear will have less wear and tear on a light weight person than on a heavy person. The same footwear would not last as long on a heavy person since it will have to carry a heavier weight.
This could be the reason heavy people have more knee problems. The knees have to support more weight daily if a person is heavier.
