Quick answer: Water transports nutrients and oxygen, removes waste, regulates temperature, cushions joints and supports digestion. A common guideline is to drink about half your body weight in pounds as ounces of water daily, adjusted for activity, heat and health. Pale yellow urine is a good sign. Water-rich foods count, and it helps to limit sugary drinks and alcohol.
Key takeaways
Water carries nutrients and oxygen, removes waste, regulates temperature and supports digestion and joints.
The common rule of half your body weight in ounces is only a starting point, because needs vary with size, activity and climate.
Water-rich foods, herbal tea and bone broth count toward hydration, and because thirst can fade with age, a daily habit helps.
Why hydration matters
Water transports nutrients and oxygen, removes waste, and regulates body temperature. It also cushions joints and protects organs, supports digestion, and maintains electrolyte balance.
How much water?
A popular rule of thumb is half your body weight in pounds as ounces of water a day. It’s a starting point, not a rule: needs vary with size, activity, climate and health. People with heart or kidney conditions should follow their doctor’s fluid advice.
Adjusting your intake
Drink more with exercise, heat and illness, and spread water through the day. Check your urine color: pale yellow is a good sign.
Hydration beyond water
Cucumber, watermelon, celery, lettuce, berries and citrus are high in water. Herbal tea and bone broth count too.
Limit dehydrating drinks
Limit alcohol, sugary drinks and juices, and large amounts of caffeine. You can find more tips in key rules.
Healthy aging lens
Thirst can decline with age, so building a habit matters. See hydration and electrolytes.
What the research shows
Hydration research in healthy adults is limited, but water intake before meals has been tested in a randomized trial.
Water before meals (Dennis 2010, randomized trial). 48 adults aged 55 to 75 with overweight or obesity followed a lower-calorie diet for 12 weeks, and half also drank 500 mL of water before each meal. The water group lost about 2 kg more, and at the start of the study they ate less at a test meal after drinking water (498 kcal vs. 541 kcal). A limitation is the small size and that the calorie-lowering effect of the water preload had faded by week 12.
Strength of the evidence: Evidence here is thin: one small trial found extra weight loss with water before meals, and no trial shows that drinking more water lowers inflammation. Most healthy adults can use thirst and pale-yellow urine as a guide.
When to see a naturopathic doctor
It may be time to see a naturopathic doctor if you have a chronic inflammatory, autoimmune or digestive condition, or if you have diabetes, kidney disease or take medications affected by diet changes. The same is true if you are pregnant, breastfeeding, or have a history of disordered eating, or if you want a plan tailored to your labs, symptoms and goals.
See a medical provider promptly for severe abdominal pain, signs of an allergic reaction such as swelling or trouble breathing, or fainting.
Want an anti-inflammatory eating plan built for you?
A free 15-minute consultation with Dr. Kneessi. No cost, no obligation. In-office in Odenton, MD or by telehealth.
Questions to bring to your clinician
These questions can help you get the most out of your next visit.
How much fluid makes sense for me, given my activity, medications and any heart or kidney concerns?
How much water should I aim to drink each day, given my activity and health?
Do I need electrolytes, or is plain water enough for me?
Could any of my health conditions affect how much I should drink?
Frequently asked questions
How much water should I drink?
A common guideline is half your body weight in ounces, adjusted for you.
Do other drinks count?
Herbal tea, broth and water-rich foods count.
Can I drink too much water?
Yes, very large amounts can lower sodium dangerously.
Does coffee dehydrate you?
Sources
- Popkin BM, D’Anci KE, Rosenberg IH. Water, hydration, and health. Nutr Rev 2010. PMID: 20646222. https://pmc.ncbi.nlm.nih.gov/articles/PMC2908954/
- Armstrong LE, et al. Urinary indices of hydration status. Int J Sport Nutr 1994. PMID: 7987361. https://pubmed.ncbi.nlm.nih.gov/7987361/
- Kenney WL, Chiu P. Influence of age on thirst and fluid intake. Med Sci Sports Exerc 2001. PMID: 11528342. https://pubmed.ncbi.nlm.nih.gov/11528342/
- Rogers IR, Hew-Butler T. Exercise-associated hyponatremia: overzealous fluid consumption. Wilderness Environ Med 2009. PMID: 19594207. https://pubmed.ncbi.nlm.nih.gov/19594207/
- Killer SC, Blannin AK, Jeukendrup AE. No evidence of dehydration with moderate daily coffee intake: a counterbalanced cross-over study in a free-living population. PLoS One 2014. PMID: 24416202. https://pmc.ncbi.nlm.nih.gov/articles/PMC3886980/
- MedlinePlus: Dehydration
- MedlinePlus: Fluid and Electrolyte Balance
- Dennis EA, et al. Water consumption increases weight loss during a hypocaloric diet intervention in middle-aged and older adults. Obesity (Silver Spring) 2010. PMID: 19661958. https://pubmed.ncbi.nlm.nih.gov/19661958/
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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