High-Sugar, Low-Caffeine 'Energy' Drinks Don't Work

Study shows they actually make you sleepier

By Steven Reinberg
HealthDay Reporter

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FRIDAY, July 21 (HealthDay News) -- People who think sugary drinks are a pick-me-up may be in for a letdown: New research finds sweetened beverages actually boost sleepiness.

"People wishing to alleviate sleepiness through the consumption of a high-sugar, low-caffeine content energy drink -- erroneously believing the 'sugar rush' to be effective -- should avoid drinks that have little or no caffeine," said study co-author Clare Anderson, from the Sleep Research Centre at Loughborough University in the United Kingdom. "It is caffeine that is particularly effective for alleviating sleepiness, not sugar," she added.

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Anderson and her colleague Jim Horne found that, one hour after drinking a high-sugar, low-caffeine drink, people had slower reaction times and experienced more lapses in concentration than if they had consumed a caffeine- and sugar-free beverage.

They reported the findings in the July online edition of Human Psychopharmacology: Clinical and Experimental.

As Anderson explained, "Many soft drinks contain large amounts of sugar, and previous findings had indicated that such large amounts may improve cognitive performance. However, these effects were almost immediate."

The real question, for Anderson, was whether that quick boost had any longer-term effect beyond the first 15 minutes after the so-called sugar rush disappeared.

To help answer that, she and Horne had 10 healthy adults restrict their sleep to just five hours on the day prior to the trial. Then, 60 minutes after eating a light lunch, these healthy adults were given either a high-sugar, low-caffeine energy drink (42 grams of sugar plus 30 milligrams caffeine) or an identically tasting zero-sugar drink used as a placebo. Forty-two grams of sugar is equal to about 8 teaspoons, Anderson said.

The participants were next asked to complete a 90-minute test during the afternoon low-energy period. The test assessed their level of sleepiness and ability to concentrate.

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