Well, it's impossible not to take diet pills, or laxatives will do.

If you can keep eating for six days, you may lose weight 10- 15 kg in six days.

I have been trying to lose weight for years. If you don't take diet pills and exercise properly every day, it is still possible to lose 3-5 kg a week.

the fact proves (that)

Actually, I think it's good for your mother to see you thin. Mothers actually want their children to be healthy, don't you think?

I hope my answer can help you.