Can you gain weight in a week by eating not much healthy food and if you can how much it can be?

yes since it is not healthy you can gain weighthow much you gain deoendes on the total fat it has also when you eat before bed all that food turns into fat because you are not burning it off so the food does not move like if you brn it off it stays in the same place and makesfat so eat early and dont eat before bed or else you will gain weight.