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Yes, excessive carbs can lead to diabete but only if you are seriously overweight and you don't move enough.
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That just isn't true, Saintor. I work with a woman who is 5' 8" talll and maybe 125 pounds soaking wet who runs and bikes avidly. She's thin enough that I have wondered to myself a few times if she isn't anorexic. She was just diagosed with type 2 diabetes a few weeks ago. Her only risk factors are a high carbohydrate diet (she tends towards vegetarian eating) and the fact that she is African American.
Yes, a higher proportion of type 2 diabetes patients are going to be overweight and underactive (now which came first, the chicken or the egg?), but there are plently of active normal weight type 2 diabetics as well; enough to make your statement untrue.
In most cases, insulin resistance is not
caused by overweight and inactivity, it is
the underlying cause of the overweight and therefore the inactivity; it's a symptom, not a direct cause. Sort of like blaming severe arm pain as the cause of the fracture underneath.
Back to your assertion that China and Italy have a lower incidence of diabetes than we do. The fact is, their population still suffers from that disease and those populations that have a very low carbohydrate intake have a much closer to zero incidence of diabetes than any other cultures. We then have to ask ourselves what the difference is between us and those countries with a lower incidence of diabetes and Wooo did a very nice job of outlining those differences. It can be neatly summed up like this: an all carb diet is not going to cause obesity if you are eating starvation level calories. As soon as your calorie intake reaches or exceeds equilibrium with your caloric expenditure, trouble starts brewing.
I'd also like to point out that not every region in Italy is high on pasta consumption and that
Sardinia, a region in Italy, has the second highest rate of diabetes in the world.
Still, average rate of pasta consumption is
60 pounds per capita per year. That works out to 2.63 ounces per day; obviously, Italians are eating way more of other things than they are pasta since their average daily pasta consumption contributes 294 calories daily to their diets so it seems that when given a choice, people at least in Italy are choosing to not make rice and pasta the cornerstone of their diets.
What do Italians eat lots of ? Vegetables, fruits, olive oil (10 liters per person per year), butter,
cheese and
eggs. Interestingly enough, Japan has the highest egg consumption of all countries listed.