If you drink nothing but water, you'll trigger a major metabolic shift. Surprisingly, the catalyst isn't the hydration itself it's the sudden, jarring absence of
everything else.

For the first 48 to 72 hours, the primary effect is withdrawal.
An average adult consumes significant amounts of caffeine and sugar through coffee,
tea, soda, and energy drinks.

Abruptly stopping caffeine causes the blood vessels in the brain to dilate, often resulting
in throbbing headaches, fatigue, and irritability.
Sugar withdrawal can cause temporary mood swings and intense cravings as the brain
adjusts to the absence of dopamine spikes previously triggered by sweetened beverages.

By the second week, a different mechanism takes over: a dramatic reduction in liquid
calories.

Beverages are a stealthy source of energy because the body does not register liquid
calories the same way it does solid food, meaning they do not induce a feeling of
fullness.

A daily habit of two cans of soda or a sweetened latte and a glass of wine easily
amounts to 400 to 500 calories.
Eliminating this intake can create a caloric deficit large enough to cause a loss of about
one pound per week, without any changes to solid food consumption or exercise routines.

Without caffeine interfering with adenosine receptors late in the day, or alcohol
disrupting REM sleep cycles, sleep quality improves significantly.
Deeper sleep allows for better cellular repair.
Simultaneously, the skin benefits from the combination of adequate hydration and the
removal of sugar.
High sugar intake promotes glycation, a process where sugar molecules bind to collagen
and elastin, making the skin stiffer and more prone to wrinkles.
Dropping sugary drinks halts this process, often leading to clearer, more elastic skin.

Over the long term, the kidneys function more efficiently.
Kidneys require water to filter waste products like blood urea nitrogen; without the
diuretic effects of alcohol or the heavy sugar loads of sodas, they can maintain a steady
fluid balance and reduce the risk of kidney stones.
Dental health also sees a stark improvement.
The acidic nature of sodas, juices, and coffee erodes tooth enamel, while their sugar
content feeds plaque-causing bacteria.
Switching exclusively to water, which has a neutral pH, removes the primary environmental drivers of tooth decay.

Full story: https://www.quora.com/What-would-be-the-effect-of-only-drinking-water-as-your- beverage

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