Your body depends on protein for far more than building muscle. Protein provides essential amino acids that help repair tissues, support immune defenses, produce hormones and enzymes, and maintain healthy skin, hair and nails. When intake drops too low, the body prioritizes vital systems and reduces support for other functions, which can lead to subtle warning signs that something in your diet may be missing.
One of the earliest clues can be declining strength or muscle loss, as the body may break down muscle tissue to meet its protein needs. Other signs may include brittle hair and nails, dry skin, constant hunger or difficulty feeling full after meals. Because protein helps slow digestion and maintain satiety, meals that lack it often leave people craving food again soon after eating.
Low protein intake can also affect how the body repairs itself and fights illness. Cuts or bruises may heal more slowly, exercise soreness can linger, and frequent infections may become more common since immune cells rely on amino acids to function properly. Experts say most adults need at least 0.8 grams of protein per kilogram of body weight daily, though older adults and active individuals may benefit from slightly higher intake to maintain muscle, recovery and overall health.
SOURCE:
The Hearty Soul, 6 Red Flags Your Body Is Giving You That You Need More Protein