Yes indeed indians are more prone to Diabetes than Europeans or africans. The reason perhaps lies in our genes.
The 'thrifty genes hypothesis' which has gained considerable popularity mentions that in ancient times human race lived through the alternating times of famine and abundance- specially in our subcontinent. During the times of abundance body would store energy to survive droughts & famines - these stores are by the way of fats.
But in the modern era - food supply is abundant while physical work and more over hardships of famine are completely gone.
Our body still keeps on storing energy ( fat deposits) without subsequent utilizations, this leads to rise in blood lipids ( fats), damage to pancreas due to excessive glucose and fats in blood, excessive insulin requirements- insulin resistance, damage to blood vessels, formation of atheroscler otic plaques and its complications like Heart attack, stroke etc.
Important thing to watch for is Intra Abdominal deposition of fat. This is more harmful than subcutaneous fat deposits. But it can be used as a measure to predict the possiblity of Diabetes and insulin resistance.