Originally Posted by Seejay

Yes, he says you can add a few grams of carbs for situations like that. I think the number is, 15-20 should do the trick. Just like what you did!

He also says you can have more grams of protein (and correspondingly less fat) in the first weeks, especially for older people. I think that means about age 40 or when things start to go south.

The reason is, it takes at least a few days for the enzymes and other metabolic "helpers" to downregulate carb enzymes and upregulate fat enzymes. And it can take weeks for the organs to get used to the switch to running on fat instead of protein/carb.