How do you loose 100 lbs?

Well it takes 3 main things 1 time 2 exercise 3 eating healthy.

I recommend working out 3 to 5 times a week for 45 to 60 minutes (Workout really hard)

Eating healthy on an athletes Diet is simple; lots of protein, no carbohydrates, 6 meals a day, very few dairy products other than plain yogurt or Greek yogurt and almond milk, take vitamins and stay away from peanut butter. (These are the basics)

If you follow this in time you will drop 100 pounds and probably gain a lot of muscle.