If you look at yourself regularly and pay attention you can see your body change pretty rapidly. I’ve specifically watched my body bulking up on its own before burning those stored calories to build muscle and there’s a clear cycle of noticing a bit more pudge a few days before I suddenly make a big jump in cycling distance or how much I can lift (and the pudge also goes away at the same time)
If you stop eating for a week you can lose a cool 7kg of a lot more than just water mass. Get off your high (uninformed) horse
Yes, in less than a week even! Try it sometime. Its really cool to watch your body adjust and see just how much control you have over your body!
If you don’t regularly exercise and start exercising 5 days a week you will see the changes in your own body after about a week, you might see a small change on the scale after 2 weeks and after 4 weeks someone close to you should be able to see the changes in your body, and after 12 weeks someone you don’t see often should be able to see the changes in your body. Since you see yourself every day and you can feel how your body feels you can see the change very quickly
You aren’t going to “slim down” in a week no matter what you do. Read the freaking post too instead of jumping in with “excercise 5 times a week”. They said “I moved to Japan, ate better and walked around for a week and I got noticeably slimmer”. That’s not a true statement, simple as.