IE 11 is not supported. For an optimal experience visit our site on another browser.
  • UP NEXT

    Women suing hair relaxing companies after cancer diagnoses

    03:57
  • Marine reunites with good Samaritan who saved his life

    04:55
  • Women sue companies that make hair relaxers, claiming cancer risks

    02:43
  • 13-minute cycle and strength workout

    13:07
  • Cyberattack disrupts Ascension health care network

    00:25
  • Miss Teen USA resigns just days after Miss USA gave up her crown

    02:01
  • Here's what to know about the California tuberculosis outbreak

    04:46
  • Adding olive oil to your daily diet may help prevent dementia

    01:16
  • Measuring blood pressure: Hypertension impacts, prevention, more

    04:45
  • Miss USA 2023 Noelia Voigt steps down citing mental health

    02:32
  • Hoda Kotb reveals how she motivates herself for 3 a.m. workout

    01:33
  • Celebrity trainer shares spring workouts for all every muscle group

    05:26
  • What to know about skin cancer: Self-exams, safety tips, more

    03:38
  • Pediatric nurses reunite with former cancer patients live on TODAY!

    09:10
  • Dairy worker with bird flu developed pinkeye but no respiratory symptoms

    02:18
  • Selena Gomez opens up on mental health journey, helping youth

    06:38
  • Walker Hayes talks sobriety journey, new album ‘Sober Thoughts’

    05:51
  • Hormone replacement therapy is safe to treat menopause: study

    02:16
  • A surge of anger could raise risk of heart attack, new study shows

    03:58
  • Kelly Corrigan talks PBS show about mental health, well-being

    05:29

New study finds most people don't need eight cups of water a day

02:25

A new study found that drinking eight cups of water, which has been the standard recommendation since 1945, may not be necessary. NBC News medical fellow Dr. Akshay Syal explains how researchers observed that water intake varies from person to person based on age, sex, size, activity, and the climate one lives in.