How do you lose 40 pounds in 30 days?
Please do not even attempt to lose that much weight in such a short period of time. I will just go back on as soon as you stop dieting and you will be worse off. The only way to lose that much weight is to starve yourself, which is completely the wrong thing to do. Try to aim to lose between 1-2lbs per week. That way your body has a chance to adapt to your new diet and will not enter starvation mode. Hope this helps.