Weight loss is when you put a barbell down somewhere and cannot find it again.
There are various methods of losing weight.
The slow and steady reduction of intake and increase in activity. This one works and is safe.
The fast and stupid many pounds in a week that will mean losing lots of water and putting it straight back on again when your body catches on and rehydrates you to avoid damage or death.
The third is only safe for politicians, but involve losing approximately 10% of excess weight instantly. It does involve decapitation as the head is usually 10% of your weight, but the average politician doesn't see or hear what goes on around them, think, and none of us will miss their mouths so it is excess weight.
Sorry this post is a bit silly, but we do need a lot more detail to make sensible comment.