Set up a diet journal. Usually, weight loss coaches ask you to keep a food diary while you are dieting. And that’s a good habit. But it is also important to know your food habits before you diet. So when you’re starting a diet, keep a log of how many calories you eat every day. That number provides a starting point for the entire weight loss program. Then maintain your weight loss journal throughout the dieting process. A well-organized weight loss journal helps many dieters stay on target when challenges arise.