Have you ever wondered how the calorie counts on food labels are calculated or why some foods, like corn or nuts, seem to pass through your system undigested? The truth is, the calorie numbers we rely on are estimates that don’t fully reflect how our bodies process food. While devices like bomb calorimeters measure the total energy in food, human digestion is far less efficient, and nutrients like vitamin A serve entirely different purposes. In this post, we’ll explore how calories are determined, why foods like corn and nuts deliver fewer calories than labeled, and how essential nutrients like vitamin A are used to rebuild your body rather than fuel it.

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