That depends on whether or not you eat anything else. Please feel free to ask the question again and include more detail.
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NO you'll gain weight though
can you slice and toast your crostini the day before you need them
you will probably get very sick, as the toast has little nutritional value. however, saying that, eating a pice of toast may make you lose weight. but in the long run, it will cause you to gain weight, a result from malnutrition. in a week nothing will change noticeably, but you may lose up to 5 kg. however, please do not live on this. it isn't a diet! this is a bad idea!
For a while, yes. Soon, though, you will begin to show signs of malnourishment and possibly die because that is far too little food. Also if the goal of "4 slices of toast a day" is to lose weight, it will not work very well. Eating that little will screw up your metabolism and make you gain weight when you eat normally again.
You can't. It takes longer than a day to lose weight from your thighs (or anywhere, for that matter).
yes
Dont eat
That's kind of not how it works. You can't lose weight by "eating ice all day."
you'd lose no weight.
Yes
if run 2km per day how much weight do you lose in a day?
You cannot lose 7 pounds of body weight each day.