Losing 100 pounds is not an easy goal to achieve, especially within a limited time frame. It is not healthy to lose more than 2 pounds a week, but initial weight comes off more quickly for a larger person. To lose 100 pounds in six months, you will have to lose roughly 4 pounds a week which, while quite hard, is attainable with a physician's guidance. It requires a complete lifestyle change that is outlined below.
Eat better. This is the most important part of the process. Cut out junk food and stick with hearty and wholesome whole-grain foods. Lean meat, fruits, vegetables and nuts will become your staples. These foods are not only low in fat but also help your body fight fat. Avoid alcoholic beverages and sodas.
Get off the couch and run. Cardiovascular activity of any kind that raises your heart rate will help burn fat. Start slow, exercising for 20 to 30 minutes three days a week. As you become more comfortable, increase the intensity of your cardio workout. Studies have shown that increasing the intensity of cardiovascular activity is much more beneficial for burning fat and keeping your metabolism elevated throughout the day than slower, longer cardio activity. You are going to really have to push yourself to meet your goal.
Lift weights. Weightlifting completes the three-part plan for effective, healthy weight loss. If you are unfamiliar or intimidated by the weight room at your gym, work with a personal trainer who can introduce you to the exercises you should incorporate in your personalized routine. Again, start slow, but keep your goal in mind each time you pick up a weight. Don't be afraid to push yourself.