10. Head Sweating
One of the first, classic signs of vitamin D deficiency is a sweaty head. In fact, physicians used to ask new mothers about head sweating in their newborns for this very reason. Excessive sweating in newborns due to neuromuscular irritability is still described as a common, early sign of vitamin D deficiency.
11. It May Speed Up Multiple Sclerosis
Previous research has found that low vitamin D levels are associated with an increased risk of neuromuscular disorders such as multiple sclerosis, Parkinson’s disease, and others. Now, a new study suggests that if you have multiple sclerosis, low levels of D could speed the severity and progression of the disease, JAMA Neurology reports.