On any eating plan, the usual recommendation is a minimum of 8 glasses of water per day. Many people, particularly women, suffer from inadequate hydration, so it is important to be diligent about drinking water throughout the day. Drinking sufficient water will also help flush toxins from your body and combat such problems as constipation and bad breath. Note that coffee, tea and diet sodas do not apply to the daily minimum. Adequate hydration also assists with weight loss.