Unsurprisingly, there are many apps available for food journaling, and they vary greatly in their functions. Consider your goals before you select one. MyFitnessPal, one of the most popular apps on the market, allows you to enter all the food you eat so that you can track how many calories you consume and obtain information on the percentage of fat, carbohydrates, protein, and other nutrients in your diet. See How You Eat lies at the other end of the spectrum, helping you keep a photo diary of all of the food you eat without requiring any complex input.

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