Yes, it is possible, but it is far from healthy, and you will be a complete wreck if you try it. You need to stop eating completely, and at the same time work out to burn energy. This combination is on the verge of being deadly, and whether you would be able to complete it remains to be seen. Also, as soon as you start eating again, your body replenished anything it has been missing, so you'll gain a large part of those 10 pounds immediately. Conclusion: don't try this at home.