Not eating for a week will cause you to lose wait. However, this is not recommended as this is highly dangerous and could cause you harm.
a week
stop eating Mcdonalds!
you stop eating junk and excersize
You'll probably lose weight by just eating popcorn for a week, but it will be mostly water weight and the weight you lost (and usually more) will come back on once you start eating normally. It's best to eat a varied diet with lots of lean meats, low-fat dairy, whole grains, fruits and vegetables.
You can loose some pounds, but after that week. What would you do then?
You can lose 1 pound per week by eating 500 fewer calories each day (500 x 7 = 3500 per week)
9
No, not really. Ignoring surgery, that would require eating nearly nothing, yet working out hard pretty much the whole day.
It's possible, but NOT smart!
If you are eating 1500 calories a day you will lose 1 lb. if you are eating 1200 calories you will lose 1.6 lbs.
Sorry- there is no way to lose 40 pounds in one week that would not kill you. A weight loss diet will typically reduce weight by about 2 pounds a week. Even if you ate NOTHING for a week you would not lose 40 pounds.