To lose 80 pounds in 5 months you will have to make massive changes in your lifestyle and diet. You will have to start keeping a journal to track the calories you consume per day. To lose one pound of fat you will have to shed 3500 calories per week. Therefore, to lose 80 pounds you will have to shed 2800000 calories which is not a realistic goal. Eating few calories everyday will make your feel hungry; therefore eat lots of fruits and vegetables which are low in calories yet packed with essential nutrients. Foods like non fatty dairy products, lean meats and fish also fill you with essential nutrients and are low in calories.
If you are not sure about food choices to lose weight, you can follow diet planners like Nutrisystem that have a long standing in the weight loss field. Nutrisystem delivers prepackaged diet meals that are portion controlled, calorie controlled and balanced in all aspects. It also provides specialized plans like Nutrisystem D for dieters with type 2 diabetes. In the first month, you will need to follow their Turbo 13 plan which claims to provide 13 lbs and 7 inches of weight loss in one month. Check Skycube to know more about Turbo 13.
To lose weight more effectively you can add one hour of intense cardiovascular exercise to your daily routine. The cardiovascular exercises like running, biking and aerobics will make you burn greater number of calories. When you perform cardio workouts for an extra hour once in a week you will be able to burn more number of calories and shed about 27 pounds in five months. This way you will be burning a little more than five pounds per month. However, ensure that you do not go below 1200 calories per day as it will bring down your energy levels.