Originally Posted by Helmi_17
Freedom - In theory you are absolutely correct. One pound of human fat is about 3,500 stored calories.
However, there are some people who are at a daily caloric surplus in their diet. As a matter of fact, I would say this is the majority of people. These people will have to cut more than 500 per day. If you are currently overeating by 500 calories for example, you would need to cut or burn 1000 per day to go into caloric deficit.
There are other problems with using the mathematical "theory" to weight loss.
1. It's almost impossible to know your base metabolic rate without a medical professional doing tests.
2. Also, there is something called the "Thermic Effect of Food". This describes the number of calories your body uses to digest what you've eaten. Everything you eat has a different thermic effect. Protein has the highest thermic effect, fat the lowest, carbs in the middle. This means that even if you meticulously track your "calories in" you're still going to be off on your math. If you're at too much of a caloric defecit, you'll put your body in famine mode and fail to lose weight no matter what you do.
Another thing to add is that eating 200 calories of protein/fat is more difficult to digest than 200 calories of refined sugars, so your body should actually use a bit more energy to break down the proteins/fats, and you'll actually feel full for longer since it takes longer to digest.