Whenever you're following a type of diet for weight loss, one of the key principles and/or tools that you should have in your repertoire is some sort of tracking food intake. Knowing exactly how much you are putting in will allow you to monitor your progress and adjust if you notice that weight loss stalls.
This video is a lesson from my 2015 course on ketosis and intermittent fasting for fat loss. It's a indepth overview of how I track caloric intake with Cronometer, a free online tool.

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Cristi Vlad, Self-Experimenter and Author