The only way to know exactly how many calories you eat is to weigh your food and use a nutrition tracker, as estimating your portion sizes and calorie intake is not unreliable (75Trusted Source, 76Trusted Source).
Tracking can also provide insights into your protein, fiber, and micronutrient intake.
Though some studies have found a link between tracking calories and disordered eating tendencies, there is some evidence that suggests that people who track their food intake tend to be more successful at losing weight and maintaining their weight loss (74Trusted Source, 77Trusted Source, 78Trusted Source, 79Trusted Source).