OK, in order to lose 100 pounds in 2 months, you'd need to lose 1.6 pounds/day..that is a massive amount of weight loss to expect from yourself on a consistent basis over the course of 2 months.
The way weightloss works is this: Take your weight in pounds and multiply it by 15..that will give you the calories you need to take in each day just to maintain your current weight.
To lose weight, you need to take in less calories than this...you can do cardio to help create more of a calorie deficit as well.
So if you weighed 350 pounds for instance, it would be 350x15 = 5,250 calories/day. Now in order to lose 1 pound, you'd need to burn 3,500 calories.
The lowest amount of food you should ever take in daily is 1,200 calories...which in the case of a 350 pound person would create a 4,050 calorie deficit, which would equate to 1.1 pounds lost/day.
For this 350 pound person to lose the 1.6 pounds we talked about before, they would have to create an additional 500 calorie deficit that day with about 1 hour of exercise..then it would be possible for them to see the kind of weight loss you're looking for.
Now, this doesn't take into consideration weight loss stalls, which do happen, and also...as you get lower in weight, your maintenance will get lower, and you will not be able to create such a large deficit anymore, definitely not in any kind of healthy way.
So I don't know where you're starting from, but if you're not that overweight as in this example ...and actually, even if you WERE... It would benefit you to be more realistic in your goals.
You did not put on 100 pounds in 2 months, so you should not expect to lose it all in that time frame.
Start changing your eating habits a bit at a time....change 1 meal(breakfast)..then once that gets comfortable, change lunch..then dinner...
Switch out processed foods for whole foods (fruits/veggies/lean meats/whole grains)...
Count your calories and get a food scale ...be precise...it is necessary if you are serious about making a lifestyle change, once you are used to things you can then start to eyeball what you eat...but it is a good idea to start out weighing food and counting calories...track this all on websites like "Fitday"...
Don't try to have the perfect diet from day 1..take it 1 day at a time...make incremental progress...stay motivated each day..its like taking a shower, you don't shower 1 day and you're set...you gotta shower every day and you gotta keep your motivation up every day. Watch motivational Youtube weight loss vids to help.
If you need any more info on how best to structure your diet/exercise,
You can find out more here.
