what happens if you’re in a calorie deficit when you have no fat to lose?
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In short, your body starts converting muscle (protein) into energy. After a certain point (>4 weeks of no food), your muscles (including your heart) has atrophied (in this case, been used as energy) to the point that you’re too weak to sustain yourself; protein is essential for cell production and when the protein is gone, so is cell production.
No one dies purely from starving, what they die from is typically infection (due to the body not having enough energy to fight off infections/viruses) or heart failure (due to said muscle atrophy).
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