ENERGY SLUMPS VS. DEHYDRATION :
For someone eating a diet of 2,000 calories per day, this adds up to 2,000 ml (roughly 64 oz), or eight 8-oz glasses.
On the other hand, not drinking enough water can cause mild dehydration, defined as the loss of 1–2% of body weight due to fluid loss. In this state, you may experience fatigue, headache and impaired mood.
However Dr. Trisha McDonald's recommendation of 1 Gallon [3.8 Liters ] , may be to suit the American build and weight and Calorie intake.
Indian Doctors recommend 2 liters of water under normal condition and more when having fever and Kidney problems. more