Possible, yes, I’ve done it, and many others have too, but it’s definitely not what you want to do, especially since you’re not looking for the lose it fast, gain it back fast fix. If you do lose 15 lbs in 2 weeks, 1) you always gain it back, and usually more when you lose that fast 2) you will probably lose muscle 3) you will probably slow down your metabolism, because your body will think it’s starving and will try to grab onto any food you put in it.
Eating right and in moderation and exercising is the best thing. I echo the sentiments also about not depriving yourself. Don’t expect the impossible of yourself, and don’t berate yourself just because you eat a cookie (or 5) once in awhile. Diets don’t work, of course – if they did, anyone who wanted to lose weight would go on one diet and be done with it. I’d say you could lose 5 lbs healthily in the first two weeks of a heavier exercise/better eating program, and more slowly after that.
Be sure you don’t cut your calorie intake so much that you lose muscle instead of fat. The more muscle you have, the more calories you burn, just sitting there. The more muscle you lose, the less you can eat and maintain your weight.
A really good way to make exercising WAY more fun and easier to do is to train for something. Enter a 5k walk or run, or a 1000-yard swim event, whatever you can handle right now. I’m training for a mini-triathlon right now. Although I work out pretty regularly anyway, it’s so much easier to train now that I’m “training,” like an athlete, rather than “trying to lose weight” or “trying to be good.” It is a great motivator and it makes you feel like one of the cool people
instead of one of the somehow-less-than-adequate-in-our-society-because-they-don’t-have-perfect-bodies-people.
And finally, I heartily recommend and wish everyone in the world would read Geneen Roth’s books, which are full of wisdom about emotional eating, NOT dieting, learning to eat only as a response to hunger, and all kinds of other wise advice. Her books have great messages for everyone, including people who have never had any type of food or weight issue. A good start is “When Food Is Love.”