A diet diary is a written record of the food and drinks you consume over a specific period, typically for a week or more. The purpose of a diet diary is to track and monitor your eating habits to identify patterns and areas where you may need to make changes in order to achieve your health goals, such as losing weight or managing a medical condition.

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A diet diary typically includes information about what you ate, how much you ate, and when you ate it. It may also include information about your mood or hunger levels before and after eating. Some people also include information about their physical activity and exercise routines in their diet diary.

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Keeping a diet diary can be a helpful tool for weight loss, improving nutrition, and managing medical conditions such as diabetes or high blood pressure. It can help you identify problem areas in your diet, such as consuming too much sugar or not getting enough fruits and vegetables, and help you make more informed choices about what you eat.

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To keep a diet diary, you can use a notebook, a smartphone app, or a website that specializes in tracking food intake. It's important to be honest and accurate when recording what you eat, even if it's something you're not proud of. The more accurate your records are, the more helpful they will be in identifying areas where you can make improvements.