A study done by the University of Chicago, published in the magazine "Annals of Internal Medicine" points out that not getting enough sleep alters hormones which can then lead to obesity.  Conclusion: ...

Losing 10 pounds in a week?
Don´t trust diet plans that offer a very quick weight loss (more than 3 pounds per week). Those are surely fad diets that will only make you lose body liquids and muscle mass (but not fat), and they can even be hazardous to your health. Make sure to consult a nutrition professional before you begin any structured diet program.