Articles #sleep problems

In the past two decades of practice, if I were to name one single factor that silently disturbs sleep, weight, mood, digestion, immunity, memory — and often goes unnoticed in our usual investigations — I would say it is this: Cortisol.

Vitamin D is not just a “bone vitamin.” It is a vital hormone-like substance influencing bones, muscles, the immune system, cardiovascular health, and even mental well-being. Deficiency is often silent, creeping in unnoticed, but its long-term consequences can be profound. As physicians, we encounter this problem daily in practice, yet it remains underestimated by patients and even some professionals.