LogFAQs > #884750935

To my understanding, it's not unrealistic, but it requires an incredible amount of devotion to do it in a healthy manner. Someone that doesn't diet or exercise often will lose more weight than usual the first few weeks, then the weight loss will dramatically slow down; this is when many give up.

"To lose 2.5 pounds of fat per week, you must create a deficit of about 1,250 calories per day by increasing your daily calorie burn and decreasing the calories you consume"

http://www.livestrong.com/article/48248-good-diet-plan-lose-lbs/

I am not a dietitian, only a personal trainer; this type of weight loss isn't for everyone, since it is difficult to commit to, and not everyone is ready for that right off the bat.
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