Originally Posted by Dare Vodusek
What would be the definition of overfeeding, how many calories daily via carbs?
Overfeeding studies conducted under metabolic ward conditions where subjects are overfed by as much as 50% more than daily energy requirements suggest that ingesting ≥500g of carbohydrate per day over a period of 5-7 days will result in a small increase in de novo lipogenesis (DNL). To put this into perspective, this is equivalent to consuming 500g of table sugar (sucrose) or ~1800g (4 lb) of cooked white rice every day for a week on top of your normal diet to produce a tiny amount of fat. Under real world conditions this level of overconsumption just isn't going to happen, or at least not by accident, which is why DNL is not considered to be a significant metabolic pathway for fat storage in humans.
Carbohydrate in Human Nutrition: Carbohydrate Food Intake and Energy Balance.