How much weight would I lose in 1 month of doing this?

changing your diet to only healthy foods is the best thing you can do and will ensure you will lose weight if combine with walking everyday especially. you can eat how much you like if you stay within these 3 guidelines and still lose fat naturally and gradually. You should lose 10lbs each month on average. 1.eat only steamed lean meats, eggs, healthy fruits ,vegetables, nuts, grains, & yogurt..2. drink only water, juice, & milk..3. walk or do some physical exercise 1-3 hour every day. (btw, recommend you also to buy an electronic food steamer ((Very cheap)) and a rice cooker as makes it very easy to prepare healthy meals ,,add a bit of olive oil and pepper, spices on top of steamed vegeatables, fish or chicken to add more taste if wish as these are healthy too.)

At 123 pounds i'm not sure you should really be losing a lot of weight.... that seems like a pretty average healthy weight to me. However, the amount of weight you lose is really up to your own body. Everyone loses/gains weight differently. It will also depend on your nutrition, whether you are eating the right, healthy foods. So there is no real way to tell how much you'd lose. If i'd have to guess the most would be a couple pounds per week. Also, before trying to lose a lot of weight quickly you should probably consult your doctor to ask what a good plan would be to do this or whether you should do this at all. Despite what you might think, rapid chances in weight can be really bad for your body and health. So it is important that you tackle this diet in a way that will allow you to lose weight healthily.

Just don't overdo it and let it affect your health