Gaining

Drink a quart a day spaced through the day with cookies, cake, cheesecake, etc.

Make sure it is in addition to your regular diet and do it every day. This is the most effective ... and most pleasant as well.

This works best done for weeks rather than days.

no, it would do a number of things...

Likely make you throw up....

Overload your system and cause you to have the runs ....

Dehydrate you due to the runs...

Exceed what your body can digest meaning that even if you manage to not throw up ... you will just have creamy shit!

I would certainly not recommend doing this!