Human: I'm trying to lose weight and I've heard that it is important to keep a food journal. What is a food journal and how do I use one? Assistant: 
A food journal is a way of keeping track of the foods you eat, including calories, fat grams, carbohydrates, protein, and other nutritional information. Keeping track of your diet can help you stay on track with your goals for losing weight, as well as helping you identify any unhealthy eating habits or food sensitivities you may have. To use a food journal, simply write down all of the meals and snacks you consume each day. You can also include details about the ingredients in the meal, such as portion sizes, cooking methods, etc., so that you can better understand what you are putting into your body.