A lot, I lost 7 stone in 9 months from a 1000 a day calorie diet.
WARNING, you may faint often, especially if you are an active person, you will get obsessed about calories and people will worry about you! It is not healthy, try a more moderate diet! If you won't try a moderate diet, eat plenty of veg, wholemeal bread, rice, pasta etc to fill you up for longer- avoid hunger spikes etc and try low calorie bread (such as hovis, wholegrain nimble) with high in protein fillings such as low fat pate or low fat cheese, trimmed bacon etc. (my famous 150 calorie bacon Sandwiches). use low fat spreads, 0% fat yoghurt is a good snack! Wholegrain cereal such as weetabix or shredded heat with skimmed milk for breakfast, both around 200 calories for two biscuits.
You will eventually lose weight on a 1000 calorie diet. On such a low calorie intake, the body starts eating away at muscle for nutrients. This is not good. Consult a registered dietician.
Depends on lots of factors - current weight, amount of exercise you do, height..
Long story short yes, you would be cutting your calorie intake by half, a 1000 calorie meal just became a 500 Calorie meal. creating a deficient of calories will lower your weight.
The difference between a calorie and a Calorie is calorie is a smaller unit than Calorie and it takes 1000 calorie's to make a Calorie. The Calorie (kilocalorie, kcal) is 1000 calories - a more useful unit and widely used.
A nutritional Calorie is 1000 times a chemical calorie.
1000 kcal per day should be sufficient.
There are no good 1,000 calorie diets. At a thousand calories you will end up malnourished and permanently hungry. Calorie controlled diets are a billion dollar industry, and they keep to themselves that calorie counting in and of itself does not help anyone lose weight. It is the type of calorie that matters, if a negative calories (which is good) then you are likely to lose weight, and you can eat more so not feel permanently hungry.
It probably can't be done even if you don't eat anything. You must drink water and can't skip that. Our bodies are very good at conserving weight. You may be able to do it on a 1000 calorie diet over 4-6 weeks.
Diet calorie plans for only 1000 calories are sometimes safe, but it seems like it isn't very healthy, and like it just makes you lose weight from lack of enough food, so I don't know if it's safe.
The 1000 calorie diet has two sides to it and that's yes, it does work and no it's dangerous. While it does help you lose weight, eating so little can comprimise your health. An option would be to have a short time span for the diet while you use it.
Simple answer: less than those the body needs. It depends. If you don't move the whole day maybe 1000. If you do a marathon every day maybe 10000. Do you want to get rid of 20 lbs within ten years or after a week? (I exaggerated)
You can start a 1000 calorie diet by getting a food diary to record everything you ate during the day and attributing the correct calorie count to each food.