I am a diabetic so I already have a predisposition of accumulating fat easily whenever I have an insulin spike and my blood glucose is high--exactly what high GI foods are supposed to do.
My question: Is it after a workout that it is actually recommended that I eat high GI foods?
Would my progress be hindered if most of my meals contain white foods?
The only thing I eat that is white, are my pastas and rice. Everything else is clean like my fats and proteins.
But with just my grains being white, can I still expect to make good, healthy quality gains during my bulking phase?
I'm sure it is recommended that all other meals besides the post workout meal should have whole grain whole wheat products to have the complex, slower digesting carbs to keep fueling and energizing my body throughout the day, but would having a couple of meals with white foods be detrimental?
"Is it after a workout that it is actually recommended that I eat high GI foods?"
Yes, it would absorb much faster. That's exactly what you want after a workout.
"Would my progress be hindered if most of my meals contain white foods?"
You want most of your foods to be low glycemic.
"But with just my grains being white, can I still expect to make good, healthy quality gains during my bulking phase?"
Eat mostly low glycemic carbohydrates.
"Would having a couple of meals with white foods be detrimental?"
No. A couple meals that are higher on the glycemic index is completely fine.