The influence intermittent fasting has on insulin is just as impressive and possibly more important. Keeping your insulin levels low and steady is key to losing excess fat and keeping it off. Diets that are rich in processed carbohydrates (bread, pasta, rice) and simple sugars (candy, cookies, and soda) have the opposite effect. They cause your insulin levels to rapidly spike and then crash every time you eat one of these foods. The net result of this phenomenon is that your body will store more of what you eat as excess body fat instead of burning it off as energy.
Keep a food diary. Write down every meal, snack, and drink you consume as well as the approximate quantities for an entire week. Writing down what you consume actually helps us to remain mindful of what we put into our bodies and acts as a motivator to stay healthy. If you can, write down the number of calories that go along with each meal or snack you eat.

Everyone is different. How quickly you burn calories when you are not physically active can be very different from other people based on your specific genes, biology, and past. While scientists know that there are 3,500 calories in one pound, simply eating 500 fewer calories every day for a week (or 3,500 fewer calories in a week) does not always end in losing exactly one pound.