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If you have good overall health (free of disease, pain, and illness), a warm body (average 98.6 degrees Farenheit), a normal pulse (75–90 BPM), good digestion, and restful sleep; can maintain good muscle tone; have a healthy sex drive, feel happy; maintain normal blood pressure (around 120/80); and have healthy bones, teeth, hair, skin, and nails, then I would say you are eating the right amount of protein for you.
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Kate Deering (How to Heal Your Metabolism: Stop blaming aging for your slowing metabolism)