Losing 65 pounds in 3 months is an unrealistic goal unless you have an enormous amount of weight to lose. To lose 65 pounds in 3 months you will have to lose an average of 5.4 lbs per week. The recommended weigh loss rate is from 1 to 2 lbs per week. Losing more than 2 lbs per week requires you to follow a very stringent diet which is not advisable. Even acclaimed weight loss programs like Nutrisystem recommends losing 2 lbs per week. However, it provides you a diet plan in the first month called FreshStart which will help you jumpstart your weight loss journey. The plan claims to offer weight loss up to 13 lbs and 7 inches in the first month. Visit http://www.sonacreamery.com/ to learn more about Nutrisystem and its current diet plans.
In general, you will start losing weight when you consume fewer calories than you burn. Losing a pound of fat requires you to create a deficit of 3500 calories per week. As said above, to lose 5.4 lbs per week you will have to create a deficit of 18900 calories per week. This implies that you will have to create a deficit of 2700 calories per day. To achieve this deficit you nearly have to starve without food. Consuming fewer than 1200 calories per day is not recommended as it will lead to malnutrition. Even if you were able to lose around 5 lbs in a week continuing it will bring about a lot of health complications.
The advice is to aim for weight loss of 1 to 2 lbs per week which is safe and sustainable. Cutting calories and limiting portions within your recommended range will help you lose weight and sustain it. A diet that includes protein, fiber, whole foods and low fat dairy foods will help you start losing weight. An exercise routine that includes a moderate intensity cardiovascular exercise will help you burn good amount of calories.