How can lose 30 pounds in 1 month????

That kind of weight loss is impossible to do safely, it's just not realistic. Even if a person were to have liposuction it probably could not remove that much fat safely; even gastric bypass surgery might not make it possible in that span of time. Trying to lose so much weight so quickly will not work, is dangerous, and will probably be gained back because the measures taken are so extreme and unnatural.

It is very dangerous to loose that much weight at one time

Oh, I don't know. Cut off your leg? It cannot be done, and if it could, it would be seriously damaging to your health. The most FAT anyone can lose in one week is 2 pounds. Anything else is water and precious lean muscle tissue, which is really hard to get back. A sensible diet, adequate exercise (aerobic and weight training seem to work really well together) and patience is the key. When I started dieting, I lost a lot of weight the first month. Of course, I was nearly 300 lbs, and when you're that heavy, the weight comes off faster than if you only have a little bit to lose. I lost 5 lbs the first week, 4 lbs the second week, 2 lbs the third week and 5 pounds the fourth week. That seemed incredible to me. But that kind of loss is not sustainable, and after a year of dieting to get down to 200 lbs, the average lost was 2-3 lbs per week. That's a safe, healthy loss. If you try to rush it, through crash dieting or starving yourself, it might work in the short term. You'll look great. Until you start eating again. Then your body gains the pounds back quickly and brings a few friends with it. The reason for this is because when you starve your body, your body goes into "famine" mode, and slows down your metabolism because it feels that it needs to conserve energy, and doesn't know when the next meal is coming from. So when you start eating again, your body hoards every single calorie and holds on to it, not realizing that the famine is over. This completely screws up your body. Eat leafy green vegetables, lean meats and whole grains. Stay away from sugar. Exercise. Watch your calories. Eat something every 3-4 hours to keep that metabolism humming along. This works.