It is not recommended to lose more than 1 to 2 pounds per week, or perhaps 3 to 5 pounds the first week, if the person weighs more than 250 pounds, according to WebMD. Theoretically, a person would need to have a calorie deficit of 3,500 calories every day to lose 30 pounds in 30 days. Cutting calories to such a low amount with so much exercise can be unhealthy and dangerous.
It is possible to lose quite a bit of weight the first week of dieting and exercising, especially if the person is cutting starches and salt, notes WebMD. However, this weight loss is more likely to be water weight, and the weight loss should not be expected to continue at that rate.