Sorry for more off topic. This should have its own thread.
Many people of Asian descent handle all sorts of carbohydrates very well while a significant portion of people of European ancestry do not. Their condition has been characterized-- look up "metabolic syndrome" (formerly Syndrome X) which is a very common (in Western society) prediabetic state. For those with a heavy dose of diabetic genes, refined carbohydrates are poison.
There is no evidence that genetics have anything to do with the differences between Asian and Caucaisan diabetes incidence/carb metabolism. You can read about it in the conclusion of this report:
http://care.diabetesjournals.org/content/34/6/1249.long
It is probable that the diffence between skinnies and fatties are due to the bacteria living in the gut. If you transplant bacteria from a fat animal to a thin animal, they will become fat. The opposite case is also true. See:
http://mobile.nytimes.com/2013…s-can-slim-mice-down.html
http://www.medicaldaily.com/im…emic-how-do-we-fix-341106
http://arstechnica.com/science…t-hunger-trigger-obesity/
Or just Google 'fecal transplant'.
Diet is supposed to have some effect, but only in so far as 'skinny person bacteria' need a diet containing plenty of fibre in order to maintain effective levels.