It depends on the vitamin of mineral deficiency. As another person stated, usually by general symptoms like lethargy, lack of appetite, soreness etc. If it becomes severe enough, there are things like skin lesions, changes in quality of hair, skin dryness, joint pain, gingival pain, increased bleeding times and much more serious signs like chest pains and difficulty breathing. It really depends on what type of nutrients the person is lacking as they all have different functions in the body.
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