Originally Posted by Super XP
White rice and white bread causes obesity which can lead to other health issues. The reason, your body automatically converts these white filthy foods into sugar which then is converted into Fat. The fun part is, this type of Fat is "Extremely" difficult for your body to use and/or remove. The cause for this is the refinement of sugar and the process being used to create white bread and rice.
People stay away from these artificial junk food.
They don't cause obesity per se. Excess calories over that which each person requires causes obesity. There's a tribe in the pacific somewhere that eat yams all day long (simplification of facts) but their chief is renowned by his 'fatness'. My point is, too many calories cause obesity - not refined carbs.
Refined carbs do cause insulin spikes which as you have alluded to cause fatty deposition far more readily than complex or wholegrain carbs would.
However, immediately post exercise refined carbs are an excellent source of fuel as they will cause the insulin spike which is anabolic in nature and will help develop muscle and also refuel fatigued muscles by replenishing stored glycogen.
But yes, I wouldn't advise eating simple (or white, sugary) carbs outside of an exercise scenario. Prolonged exposure to elevated insulin spikes can cause diabetes (type II) as the insulin response over time becomes desensitised.
Now I'm to work at my gym!