Signs of a protein deficiency Common signs that your body is extremely low on protein include: Brittle hair and nails, often the first sign of deficiency Feeling weak or hungry, since protein supplies energy and satisfies the appetite Getting sick often without protein to boost the immune system Mood changes or trouble thinking due to fluctuating blood sugar and protein’s effect on the brain’s neurotransmitters (which regulate mood) Muscle weakness, since amino acids are essential for building muscle mass Stress fractures when bone tissue doesn’t have the protein it needs
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