Recent Posts

Health Check: does caffeine cause dehydration?

For a long time people have been told that caffeine is a diuretic. For some, this translates into advice to avoid or remove caffeinated beverages from the diet of people at risk of dehydration, or during periods of extreme summer heat.

While possibly well meaning, this advice is wrong.

By definition, a diuretic is a product that increases the body’s production of urine. Hence water, or any drink consumed in large volumes, is a diuretic. Importantly, urinating more does not inevitably lead to dehydration (excessive loss of body water).

Drinking simultaneously provides the body with fluid for absorption (avoiding dehydration) and initiates urine production. Depending on the urine losses that occur following drinking, a beverage might be more accurately described as a “poor _re_hydrator” if large fluid losses result.

Caffeine is a weak diuretic, and tolerance to this effect is …

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Recent Posts

Health Check: does caffeine cause dehydration?

For a long time people have been told that caffeine is a diuretic. For some, this translates into advice to avoid or remove caffeinated beverages from the diet of people at risk of dehydration, or during periods of extreme summer heat.

While possibly well meaning, this advice is wrong.

By definition, a diuretic is a product that increases the body’s production of urine. Hence water, or any drink consumed in large volumes, is a diuretic. Importantly, urinating more does not inevitably lead to dehydration (excessive loss of body water).

Drinking simultaneously provides the body with fluid for absorption (avoiding dehydration) and initiates urine production. Depending on the urine losses that occur following drinking, a beverage might be more accurately described as a “poor _re_hydrator” if large fluid losses result.

Caffeine is a weak diuretic, and tolerance to this effect is …

+ READ MORE

Health Check: what are coffee naps and can they help you power through the day?

Health Check: what are ‘coffee naps’ and can they help you power through the day?

Caffeine and napping have something in common. Both make you feel alert and can enhance your performance, whether that’s driving, working or studying. But some people are convinced that drinking a coffee before a nap gives you an extra zap of energy when you wake up.

How could that be? Is there any evidence to back the power of these so-called coffee naps? Or are we better off getting a good night’s sleep?
Feeling sleepy?
If you don’t get enough sleep, you incur what researchers call a sleep debt. You can build up a sleep debt without realising it, on purpose or when you feel you have no other option, like to meet work or other deadlines.

Taking a nap is a common way of …

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