How do I know if my goal is crazy or not.

I work hard to lose 2lbs / week on average. That means working out for 45 mins or more a day for 6 days a week. And I am very aware of my food (thank goodness for the food diaries) I guess what I am trying to say, is that it can be done...it just depends on how bad you want it. And then there's no guarantee that your body will respond exactly that way. Go for it thought! What's the worst that could come of it? Even if you fall short of your goal, you'll have still lost weight!

2.5 pounds a week isn't too bad, but I think your goal would be more realistic if you shot for 1.5 or 2 pounds a week. You may very well lose 2.5 or 3 pounds a week for a while just from the initial "shock" of reducing calories and exercising. However, that'd just a be a bonus, and you won't have to feel so bad about not making your goal.

Ok so I weigh 175 5'3 and I'm really looking to lose some weight in 2 months for my mother in laws wedding. I would like to be 155 2.5 pounds a week. Is that insane or pretty good.

2.5 lbs a week isn't an unreasonable goal, but only if you get in a LOT of exercise. You would need to be going pretty much everyday for at least and hour if you'd like to hit that. Doctors say it is safe to lose weight quickly but only for a short period of time... so long as you slow it down after that and go back to 1-2 lbs/week, you should be fine. The good thing is, when first starting off losing weight your body typically does respond quickest If I were you I would definitely see your doctor or a nutritionist to make sure this isn't an unreasonable task for your body. Also, in my experience, I used to shoot for really unrealistic goals, and when I wouldn't even come close or would stress myself out, not only would the added stress hinder my weight loss, I would get depressed and sometime end up gaining weight. My point is, if it takes a year to lose 20 lbs, then it takes a year and you are 20 lbs thinner... it is a whole lot better at setting short term, depressing & unrealistic goals when in a years time you might end up weighing the same and wasting time on silly ideas. Hope this helps!

p.s. You don't always have as much control over your weight loss as you would like. It is not as simple as a math calculation where 2+2 will ALWAYS equal four. There are sooo many variables in losing weight that sometimes you will be down (on the scale) four pounds in a week, but the next week up two. Don't stress if you don't quite hit the 20 pounds in 2 months.

On average I lost 2-3lbs per week but that was with 3 days of cardio i.e. Zumba, Tae Bo, Elliptical or Running and 2-3 days of weight training in classes like Bodypump. I also tried to stay under 1,250 cal but over the 1,200 calories my body needs to maintain. I cut out all beverages except water and try to eat a lot of vegetables, salads, whole grain and proteins.

This all to say it can be done. Stay focused. Don't get discouraged if things don't move as quickly as you'd like. What's the worst that can happen? You've lost weight and adopted a healthy lifestyle.