How long does it take for starvation mode to begin?

I have a friend who is convinced she is fat, even though she is only a UK size 10. She hasn't been eating for a week or so and already she looks aweful. I don't mean thin aweful, she just looks pale and tired all the time. I'm really concerned about her as I have heard of starvation mode and the effects of what it can do to people. Naturally i am terrified that this could happen to her. How long will it be until she starts starvation mode and is it possible she will get poorly?How long does it take for starvation mode to begin?
Your friend is doing a very dangerous thing by not eating. In fact starving the body is doing more harm than good. A body needs daily nutrients and vitamins to stay healthy. People in concentration camps were starved to death and many died within two or three weeks. And surprisingly it was the fatter ones who succumbed to the starvation first. To lose weight it is essential to eat breakfast because the stomach juices get to work and start to break down any stored fats in the body. Moving around helps the breaking up of that fat and so exercise is important. It does not need to be a full workout, a brisk walk for 20 minutes is enough. But most importantly it is essential to eat three small meals a day at least. As long as you are healthy this will be sufficient and losing weight should not be difficult. Ensure a balanced diet, no fried foods, no fats and reduce salt and sugar intake. Taking a vitamin supplement would also be a good idea.How long does it take for starvation mode to begin?
If these facts are verified, that she has stopped eating for a week, she could die. Contact her family, and call for an ambulance. Don't sit by and let her succumb.