Carbs are also burnt for energy and are more protein sparing. Every carb you take in isn't going to be stored as fat if it doesn't represent surplus energy. Sure you can get into all sorts of nit picking scientific scenarios but it definitely to me comes down to whether it makes you fat or not.
I'm not really disagreeing with anyone just playing devils advocate....no one is going to be able to give you actual scientific data that says carb storage increases after a certain hour. Because it doesn't exist. Everything else is talking about insulin. But since the insulin index of whey or casein is pretty darn significant and definitely comparable to brown rice or oatmeal...guess what...better not do whey either. If you have surplus calories your body can store them whether they are carbs or not.
Here is why I think people lose weight when they do a carb cuttoff in the general public: because the things that people eat after 8 pm or so while they're vegging in front of the TV are the very things that are cutting down significantly their consumption of empty calories..potato chips and shit like that. How that realted of bb'rs who tend to be more concious of that is anybody's guess.
The only thing that I could possibly point to is if you are not training late insulin sensitivity (in muscles) "tends" to be lower at night. So that would point to staying away from high insulin foods at night which would mean more things than just carbs but would not rule out low GI carbs with low insulin indexes. And we are only talking a slight reduction in insulin sensitivity and it is by no means universal for everyone becasue overall diet and traing practices affect it. So it gets very complicated.
I agree though I don't see any big need for slow carbs or otherwise if you're not working out late. But I don't think that anyone can tell you "that's going to make you fat" and have any real nutrition science on their side.
But if anyone wants to look around for studies or anything that prove that carbohydrate storage increases after a certain time of night...be my guest and happy searching
cuz I'd love to see it.