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Daily water consumption, Muscle strength

Created date

April 6th, 2017
Active senior man drinking water

The Institute of Medicine recommends that healthy males need about 3 liters (or about 13 cups) of total fluids per day.

Q. I am a fairly active 80-year-old man. Do I still have to drink eight 8-oz glasses of water every day?

A. Water is certainly important for all bodily functions and even mild dehydration can be harmful for some people. But the “8 x 8” water rule is simply a general guideline for healthy adults and is not well supported by scientific evidence. The Institute of Medicine recommends that healthy males need about 3 liters (or about 13 cups) of total fluids per day (2.2 liters or 9 cups for women). Factors that affect your fluid needs are exercise, your environment, medications, or the presence of illness and chronic conditions. Your daily total fluids can come from water, milk, juice, and other beverages. Drinks containing caffeine and alcohol should not be counted toward your daily intake, however. Talk to your doctor about your specific fluid needs.

Q. I want to work on preserving my muscle strength. I have heard that creatine can help, but is it harmful to take at my age? 

A. Creatine occurs naturally in the body and has a role in making the energy needed for muscles to function properly. It is also available as a dietary supplement. So far, there is some scientific evidence that creatine may improve athletic performance in young healthy people, but studies show that it doesn’t seem to improve strength or enhance muscle building in people over age 60. Although creatine is likely safe when it is used in recommended amounts, it can have side effects, such as abdominal pain, nausea, vomiting, and muscle cramps. In higher doses, however, it might be harmful to the liver, kidneys, or heart. It is not known how creatine interacts with medications. If you want to build your muscle strength, talk to your doctor about how to proceed. Resistance exercises have been shown to be beneficial for older adults. 

Please note: The above questions were submitted by readers. The answers are intended for your general information and should not replace a doctor’s medical advice.

Health and wellness experts practice exclusively at Erickson Living communities all over the U.S. This month our expert is Brian Tremaine, M.D., Medical Director, Eagle’s Trace, Houston, Tex. 

Dr. Tremaine received his bachelor’s degree from the University of California in Santa Barbara, Calif., and his medical degree from the University of California in San Diego. He completed both his residency and geriatric fellowships at Baylor College of Medicine in Houston. Tremaine is board-certified in internal medicine and geriatrics. He joined Eagle’s Trace in November 2011.