It's not always easy to drink as much H20 as is recommended on a daily basis, especially when there are so many delicious beverage alternatives — hello, soda — readily available for thirst-quenching purposes. At the end of a marathon or on a hot day in the sun, water may look like, well , a tall drink of water, but on an ordinary Monday spent slogging through a workday, it's not always the most appealing option. But adequate H20 consumption is crucial for maintaining not only good physical health but also good mental health .

"Drinking enough water helps our bodies function better, and when we drink the right amount, we experience benefits like boosted energy, reduced [food] cravings , and improved focus and productivity ," says certified personal trainer and nutrition specialist Rachel Trotta . "When we don't get enough hydration, it's common to feel lethargic, cranky, and even hungry." Water also helps regulate body temperature and blood volume , says Dana Hunnes, PhD, RD , senior dietitian at UCLA Medical Center and author of " Recipe For Survival .

" "If you don't have enough blood volume, you don't get enough oxygen to your vital organs — including intestines and kidneys, and even the brain — which can result in organ dysfunction and even organ failure if severe enough," she says. Additionally, Dr. Hunnes says water helps lubricate joints and organs, which is important for proper functioning and mobility.

It also aids digestion . And while most of us aren't gettin.