It's incredibly important to make sure you're drinking enough water each day. When our bodies lack proper water intake, symptoms like fatigue, dehydration, increased hunger, and digestion problems can occur, along with a slow-down in your metabolism. According to Lee, "Drinking water boosts the metabolism due to a process known as water-induced thermogenesis. When you drink a glass of cold, or even room-temperature, water, your system has to burn calories to heat it up to your body temperature."