Eat at least 1000 calories to lose weight?

my friend is also on diet, who is 5′3 and 125lbs, only eats 800 calories aday with exercices.
she lost alot of pounds and still looks healthy.
so I feel like rumor about metabolism slows down,lose fat seem not true.

A low metabolism is just a lazy persons way of saying ‘I eat too much’ - Eating more doesn’t help you loose weight, although dairy products may be fattening, having a high dairy diet helps you to burn fat quicker. It all depends on the diet you have. For instance if your on a high fatty meat diet then switch to a lower fat diet with more vegetables, then you will either stay the same weight aslong as you have moderate exercise or loose weight. Eating like the japanese do is also good for your weight, Unlike the western society, the japanese tend to eat alot of rice, vegetables and fish in their diet, which is proportioned because they eat it in a bowl insted of it all piled up on a plate. Also insted of using high calorie rich sauces to flavour their food they tend to use broths etc. Unlike the west its also rare for them to eat ‘dessert’. and so on. The Japanese happen to have the healthiest diet in the world - its why they also live longer than any other nation in the world.

If you get fat but have a low metabolism, then basically your eating too much for you. Daily guidlines on calorie intakes are just a rough average. Everyone is different and everyone needs a different intake proportion to their metabolism. To loose one Ib though its aprox. 3000 calories you need to burn.