Could i lose 100 pounds in 15 months?

If you are obese: This may be possible. A 60 pound weight loss over this period may even be more reasonable to attain. Eat healthfully ; be physically active. Aim for 7.5 to 8 hrs of sleep / night. Hydrate w at least 64 oz of water / day. Calories burned must > calories consumed. Do both cardio ; weight training. You can mix ; match different kinds of physical exercise.