Is It Wellness? The Truth about Water Consumption and Dehydration

A couple of months ago, Carol Harnett and I engaged in a video dialog about “giving employees what they want.” I think I inadvertently took the discussion off-topic, relative to Carol’s main point about giving employees the benefits they want. I talked about giving employees the wellness programs they want. As an example of programs employees want, I mentioned programs that promote hydration. As soon as I uttered the hydration example, I regretted it — but I posted the video anyway.

I’ve seen a lot of unpublished data demonstrating that employees want hydration programs. And I personally receive this feedback from employees frequently.  In fact, wellness vendors commonly have integrated “hydration tracking” into their exercise and nutrition tracking software, and some have explained to me that they do so because drinking at least 64 oz of water per day is a fundamental element of a healthy lifestyle. So why not use it as an example?

Click thumbnail for full-size mind map. Info provided in text format, below.

The problem is that most people believe that employees — and everyone else — not only want hydration programs, but need them. And this is not true. With the exception of employees doing strenuous labor, or those working in hot environments, most are perfectly well hydrated. The idea that dehydration is a significant problem in the U.S. is one of the most tenacious legends of health. And drinking 64 oz of water a day is not, as far as we know, an important part of a healthy lifestyle.

The fact that your chiropractor may have told you to drink more water, or your nutritionist has, or your physician — or the fact that your friend lost 80 pounds drinking water, or that your headaches feel better when you drink a lot of water — does not mean that most people need to drink more water.  These sorts of phenomena, indeed, are typical substrate upon which urban legends take root.

I’ll address in a separate post the pros and cons of promoting a behavior that probably doesn’t enhance health, but probably doesn’t hurt it either. In the interim, recognizing that this health myth is now deeply ingrained in our society, I understand that you are skeptical. So I’ve assembled, below, some of the most common myths about hydration and compared them to what the evidence actually shows (I’ve also included a mind map-ish diagram).

The Truth About Water Consumption, Hydration, Dehydration, and the 64-oz-Per-Day “Rule”

    • Myths
      • Dehydration is commonplace.
      • Drink at least 64 oz of water a day.
      • Thirst is a lagging symptom of dehydration. When you’re thirsty, it’s too late to prevent dehydration.
      • Dehydration is the cause of — or drinking 64 oz of water daily will help prevent — many common ailments.
        • Headaches
        • Obesity
        • Constipation
        • Fatigue
        • Acne and other skin problems
        • Kidney disorders
      • Caffeinated beverages contribute to dehydration.
      • Dark urine means dehydration.
      • Increased water consumption is linked to improved cognition, esp. in kids.
      • Drinking at least 64 oz. of water per day is an essential weight loss strategy.
    • Facts
      • The vast majority of healthy people adequately meet their daily hydration needs by letting thirst be their guide. (Institute of Medicine)
      • A 64 oz. of water per day recommendation is unsubstantiated by evidence (Valyin; Negoianu)
      • There is no convincing evidence that increasing water consumption helps prevent skin problems, kidney problems, or headaches. (Negoianu; McCartney)
      • Studies suggest that adequate fluid intake is usually met through typical daily consumption of juice, milk, and even caffeinated drinks. (Vreeman)
      • “The warning that dark urine reflects dehydration is alarmist and false in most instances.” (Valtin)
      • There is mixed evidence on the link between water-drinking and cognition, including some demonstrating that drinking water impairs cognition in people who aren’t thirsty. (Vreeman; Rogers)
      • A correlation between increased water consumption and decreased caloric consumption has not been convincingly documented. (Negoianu)
        [Note: Unarguably, children would do well to replace sweetened beverages with water.]
      • There is no evidence to support the benefit of supplemental water consumption, there also is no evidence of lack of benefit. (Negoianu)
    • Exceptions
      • Most of the myths and facts addressed above apply to healthy people who are in moderate environmental conditions and not exerting themselves. This describes most people.

References

, , , , , , , ,

  1. #1 by bianca handl on November 2, 2011 - 11:50 am

    if you want to be beautiful you have to drink a lot of water. Believe it or not ;-) … Proven By 100 of good Working Models…. in Realtity…. ;-)

  1. Give Employees the Wellness Programs They Want? | In tEWN

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 1,095 other followers