This is true. Over time a vitamin C deficiency can cause the tissues in the body to break down.
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Hypothalamic damage can lead to: loss of autonomic control of body temp., blood pressure, loss of hunger and thirst drives, pituitary hormone deficiencies.
To find the TDEE you need to know the age and height of the person.
If Alex is an 18 year old woman who is 5'2 and 125 pounds her bmr would be 1,300 her TDEE on light exersice would be 2,016.