Desperate times may call for desperate measures; however, if you're looking to lose a significant amount of weight in a short period of time, use caution. There are all sorts of crazy products and websites that claim to be able to tell you how to lose a pound a day; unfortunately, this a dangerous proposition.
Can it be done?
You can absolutely lose one pound per day. All you have to do is create a daily caloric deficit of approximately 3500. That's how many calories are in one pound of body weight. To do this, you would first need to figure out your Basal Metabolic Rate (BMR). This will tell you how many calories it takes to keep a person of your height, weight and sex alive when you're not doing much more than blinking and breathing. If you're big, yours will be high; if you're small, it will be lower. If your BMR is about 1500, dieting won't be enough. You'll need to exercise to burn the other 2000 calories, in addition to anything you consume on any given day. So if you ate 1000 calories - a very small amount of food - you'd need to burn 3000 calories by exercising. Now you know how to lose a pound a day. Sounds like fun, right?
Why it's a dumb idea
Not only is this type of dieting strategy pure misery; it's downright dangerous. Depriving yourself of food will lead to troublesome nutritional deficiencies and serious health problems. Because you would have to push yourself far too hard in the gym, you'd also be at serious risk of heat stroke and cardiovascular issues. Because this strategy also involves caloric deprivation, it will inevitably cause the body to go into starvation mode, where it will consume muscle and hoard fat.
If you're interested in dropping weight fast, consider the Dukan Diet plan or try something similar to the Ryan Reynolds workout and diet. These strategies are centered on healthy eating techniques that are guaranteed to produce results. That said, you need to temper your expectations. Although you may have noticeable, immediate results; you are not going to lose a pound a day.
If you're interested in learning more about healthy, effective ways to reshape your body, read this article explaining the fastest way to lose weight in 2 weeks. You'll find realistic, concrete ways to meet your weight loss goals, without jeopardizing your short- and long-term health.