• Consumer Health: How much water do you need?

a middle-aged woman drinking a glass of water to stay hydratedHow much water should you drink every day?
It's a simple question with no easy answer: How much water should you drink each day? Studies have produced varying recommendations over the years. But your individual water needs depend on many factors, including your health, how active you are and where you live. And, while it's uncommon, it is possible to drink too much water, which can be life-threatening. Find out more about how much water you might need and how you can tell if you're staying well-hydrated.


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Raynaud's disease: An overview
In Raynaud's disease, smaller arteries that supply blood to your skin narrow, limiting blood circulation to affected areas. This causes these areas of your body, particularly your fingers and toes, to feel numb and cold in response to cold temperatures or stress. Learn more about the causes and risk factors for Raynaud's disease and what you can do to prevent the symptoms.

Probiotics and prebiotics: Do you need them?
Probiotics are a type of good bacteria that might help with digestion and offer protection from harmful bacteria, just as the good bacteria in your body already do. Prebiotics are nondigestible carbohydrates that act as food for probiotics. When probiotics and prebiotics are combined, they interact beneficially. While more research is needed, there is evidence that probiotics might help with diarrhea following certain antibiotics; irritable bowel syndrome; allergic disorders, such as eczema and hay fever; and more. Learn more from Katherine Zeratsky, a Mayo Clinic dietitian

Antidepressant withdrawal
Antidepressant withdrawal is possible if you abruptly stop taking an antidepressant, particularly if you've been taking it longer than six weeks. And certain antidepressants are more likely to cause withdrawal symptoms than others. Learn more from Dr. Daniel Hall-Flavin, a Mayo Clinic psychiatrist.

Melatonin side effects: What are the risks?
The hormone melatonin plays a role in your natural sleep-wake cycle. Some research suggests that melatonin supplements may help treat sleep disorders, such as delayed sleep phase, and provide relief from insomnia and jet lag. But there can be side effects, and melatonin supplements can interact with various medications. Learn more from Dr. Brent Bauer, director of Mayo Clinic's Complementary and Integrative Medicine Program.

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