The source is a series of comments and replies to a YouTube video about intermittent fasting, with many comments expressing strong opinions for and against intermittent fasting. Many commenters describe their personal experiences with the practice, while others dispute the science behind it, highlighting the debate over the effectiveness of intermittent fasting and the role of hormones, diet, and exercise in weight loss. Some viewers offer alternative perspectives on weight loss, arguing that it is driven by systemic factors beyond individual choices and that the "calories in, calories out" framework is overly simplistic.

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