Sugar doesn't directly cause diabetes. DM is a disorder that is categorized by a high degree of insulin resistance and both Type 1 and Type 2 are a result of a variety of factors. The most likely reason why one would develop Type 2 would be obesity. As you lean out, your risk will decrease.
Although there is evidence to suggest that 'excessive' intake of fructose can have a detrimental affect on insulin resistance, maintaining a 'moderate' intake is acceptable. Your liver can hold about 50g at a time. This seems to be a reasonable amount to take in each day.
I also heard 1 banana a day is all someone should eat.
It's a matter of affording the calories. Bananas are essentially just fructose and glucose. The same glucose that you find in any other carb source and the fructose you find in table sugar and other fruits.
Originally Posted by killernight
If you eat the banana in the right time, you don´t have problemes. Eat in the breaksfast or before work. And the sugars of banana is diferent of white sugars, they are better.
Nutrient intake timing is very much a matter of preference. Some people respond favorably to carbs and are able to feel full whenever they eat them, some feel more hungry than before they ate the carbs. There is no rule.
The sugars in the banana are actually identical to white sugar (table sugar). Bananas contain fructose and glucose while white sugar is sucrose. The sucrose breaks down into fructose and glucose.