question: Hi doctor, For the past several years, I am suffering from brain fog, mental fatigue and poor concentration. I have consulted so many doctors, but it was not cured. However, I came to know from one of my friends that drinking less water cause these type of problems. After hearing this, I noticed that I am drinking hardly one or two glasses of water daily and this may be the reason for my symptoms. How to recover from this? Now, I have started to drink 4 liters of water per day.