Heart disease and diabetes go hand in hand and both are rising exponentially (leaving out medication and surgical intervention).
Have a look at this:
To suggest that poor people in the third world have been so seduced by McDonalds that they are abandoning their traditional diet is a little far fetched I'd suggest. What they do have in common with the fabulously wealthy, such as the oil rich gulf states, is access to very cheap sugary, carbonated drinks. Twenty odd years ago I was the Rift Valley in Kenya (hang gliding) - even then the vast amount of carbonated drink available in little shacks in the remote parts of the valley was remarkable - and that was well before I had any interest in diet whatsoever.
Read Yudkin's 'Pure White and Deadly':
His prescience is both startling and depressing.