We all know the list of what sugary and alcoholic drinks can do: weight gain, heart problems, stomach pain, skin trouble, tooth decay. But the reverse question is more interesting — what do you gain when water becomes the only thing you drink? The answer touches nearly every part of the body. Here are the nine changes.
1. You Lose Weight Faster
No special diet required. Sugary drinks are liquid calories — a single can of soda carries around 140 calories, and most of us drink several sweetened beverages a day without noticing. Cut them all out, and the calories disappear without any extra effort. Bailey calculated that replacing all drinks with water for nine days saves roughly as many calories as jogging 8 kilometers a day — a striking comparison, though the exact math depends on how many sugary drinks you were having in the first place.
2. Your Metabolism Speeds Up — and So Does Your Energy
Drinking about 17 fluid ounces (500 mL) of water in the morning gives your metabolism a measurable lift. In a 2003 study, drinking 500 mL of water increased metabolic rate by 30% within 10 minutes, peaking after 30–40 minutes. Later studies found smaller effects, but most still show a real rise. The total extra burn is modest — roughly 24 calories per glass — yet it adds up across the day, and many people report feeling more energized once they are properly hydrated.
3. Your Brain Works Better
Your brain is roughly three-quarters water, so even mild dehydration can make it harder to concentrate. Drinking water helps you stay focused, cope with daily tasks more quickly, and stay energized late into the evening. It sounds like a small thing, but for anyone who has felt the afternoon fog after too much coffee and too little water, the difference is easy to feel.
4. You Eat Less
Water suppresses appetite — and we often confuse hunger with thirst. If you suddenly crave something high in calories, a glass of water may be all you actually need. The evidence backs this up: in a 2010 trial, drinking 500 mL of water 30 minutes before a meal reduced how much older adults ate by about 13%. Over 12 weeks, people who drank water before each meal lost 2.44 kg more than those who did not.
5. Your Body Flushes Out Toxins Faster
Water helps your kidneys do their job — filtering waste and flushing it out. Staying well hydrated supports that process around the clock. The video promises this "prevents aging" and keeps you looking young and fresh; that part is oversold. What water genuinely does is help your body's own cleaning systems work properly, which is reason enough to drink it.
6. A Lower Risk of Many Diseases
Drinking enough water is linked to a lower risk of several conditions, including high blood pressure, bladder problems, and bowel cancer. These links come from observational studies, so they show association rather than proof — but the pattern is consistent: people who drink more water tend to have fewer of these problems. Want to spend less time and money at the doctor's office? A glass of water is a cheap place to start.
7. Your Heart Works Better
This is one of the most striking numbers in the whole experiment. In a six-year study of more than 20,000 adults, women who drank five or more glasses of water a day were 41% less likely to die from a heart attack than women who drank two or fewer — and for men, the figure was 54%. The researchers themselves cautioned that the finding needs confirming, and it is an association, not proof that water alone prevents heart attacks. But as one more reason to reach for water instead of soda, it is hard to ignore.
8. Your Skin Becomes Softer and Cleaner
Water hydrates your skin from the inside, helping it stay moist and clear. After a few weeks of drinking water every day, many people notice their skin looks and feels better. The effect is real but modest — water will not erase wrinkles or cure skin disease — yet as part of an overall healthy routine, it shows.
9. You Save a Lot of Money
How much do you spend on coffee to go, juices, sodas, and energy drinks each week? For many people, the total is surprisingly large. Water costs a fraction of all of them — and if you drink tap water, almost nothing. Over a month, the savings alone can be reason enough to make the switch.
What the Evidence Can't Tell Us
A few honest caveats. First, Chris Bailey's experiment was a one-person, one-month trial — inspiring, but not science. Second, the headline numbers need context: the 30% metabolism boost lasted under an hour and amounted to about 24 calories per glass, and later studies found smaller effects. The 41% heart figure comes from an observational study — it shows that water drinkers had fewer fatal heart attacks, not that water caused the difference. And the same study found the risk went the other way for heavy drinkers of other fluids: women who drank more than five glasses a day of coffee, tea, juice, milk, or alcohol had more than double the risk. Finally, "flushing toxins" and "preventing aging" are vague promises — your liver and kidneys do the detoxing; water just helps them do it.
How to Do It
1. Start with one swap — replace the soda at lunch with water, and build from there.
2. Carry a reusable bottle so water is always within reach.
3. Drink a full glass first thing in the morning.
4. Drink a glass about 30 minutes before each meal.
5. Keep water visible — on your desk, by your bed, in the car.
6. If plain water bores you, add lemon, cucumber, or mint — no sugar.
7. Track it for a week, and notice your energy, sleep, and skin.
A Few Precautions
Do not overdo it: drinking extreme amounts of water can dilute the sodium in your blood, a rare but serious condition. If you have kidney disease, heart failure, or are on a fluid restriction, check with your doctor before sharply increasing your intake. Expect a few days of caffeine withdrawal headaches if you cut coffee or tea cold turkey — taper down instead. Water does not replace electrolytes after heavy sweating or illness. And remember, water is a habit, not a treatment: it supports your health, but it does not replace medical care.
The Bottom Line
Replacing all drinks with water is one of the simplest health upgrades there is. The biggest wins are straightforward: you cut hundreds of liquid calories a day, you stay hydrated, and you save money. The headline numbers — a faster metabolism, a 41% lower heart risk — come from real studies, but they are associations and short-term effects, not guarantees. Drink water for what it plainly is: the cheapest, simplest thing you can do for your body every day.
Sources and Further Reading
• Boschmann M, Steiniger J, Hille U, et al. Water-Induced Thermogenesis. J Clin Endocrinol Metab. 2003;88(12):6015–6019. https://pubmed.ncbi.nlm.nih.gov:443/14671205/
• Chan J, Knutsen SF, Blix GG, Lee JW, Fraser GE. Water, Other Fluids, and Fatal Coronary Heart Disease: The Adventist Health Study. Am J Epidemiol. 2002;155(9):827–833.
• Dennis EA, Dengo AL, Comber DL, et al. Water Consumption Increases Weight Loss During a Hypocaloric Diet Intervention in Middle-aged and Older Adults. Obesity. 2010;18(2):300–307.
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