cyco_cc

Your diet is the most important thing and you'll have to cut back on the calories significantly and drink LOTS of (and only) water--lemon or lime added as flavor. No alcohol, no soda, no coffee, just water. It's simple math. I don't know how much soda or sugar treats you took in previously but I'll assume 300 calories in soda and 400 calories in sugar treats. Removing those cuts 700 calories per day. To lose 30 pounds you'll have to burn 30*3500=105,000 more calories than you take in, which at a 700 calorie deficit it'd take 150 days which is probably too long for you.

Do it in steps, though. For instance, for the first week remove the bullshit like soda, cakes, candy bars, etc. and replace them with fruits/vegetable, get more fiber than sugar. Then the next week, cut about 500 calories/day (if you can) and so on until you are at around 1500 calories/day. 1200-1500 calories doesn't sound like a lot but if you eat more nutritious foods that are high in fiber you'll find that your body uses those 1200-1500 calories MUCH more than a 2k+ calorie big meal (like fast food, a lot of restaurants, etc.). Keep your metabolism going by eating more times (but fewer calories) throughout the day. One meal might be some oatmeal and an apple, a few hours later maybe a banana and some almonds.

To sum it up, if you can create a 1500 calorie deficit per day through proper diet and exercise, you can lose 30 pounds in about 70 days. It also depends on how much 30 pounds is to you. If you're 40 pounds over weight, then it will be a lot harder than if you are 100 pounds over weight.