When you are making dietary changes, you want to be sure to learn from each day and figure out:
What went right?
What went wrong?
How could I have eaten better or differently?
What will I do the next time?
For example, instead of eating cookies every afternoon, try eating a bigger breakfast and lunch. You'll observe that you won't crave cookies if you eat a bigger breakfast and lunch. By frontloading calories, you'll have more energy to exercise, will improve the quality of your food choices--and will be more likley to lose weight.