How many pounds can an 16 year old lose in a day?

it depends on your height and weight

all i can help and say is::

-cut down on snacks -plan time to work out some days of the week -get active -get involved in sports -try to eat more healthy -instead of being lazy get up and do something -go on walks, jogs, or runs -drink plenty of water -instead of the sugar try a fruit or vegetable -stop eating so much junk food -try to watch how much you eat and what your eating