Caffeine anhydrous is becoming more popular as a supplement for weight loss and improved athletic performance. It is also present in food products such as caffeinated gum and energy bars. Anhydrous means without water and caffeine anhydrous is a processed, dehydrated form of caffeine.

Many people enjoy the feeling of alertness and energy that a caffeine supplement provides. Caffeine is, however, not without risk. Too much caffeine can have dangerous side effects.

Although they have different forms, caffeine and caffeine anhydrous are chemically the same.

Caffeine occurs naturally in plants such as coffee beans, tea, and cacao, which is the source of cocoa for chocolate.

Through specific laboratory processes, which include filtering out the water and other chemical components, the caffeine from these plants will form caffeine anhydrous.

This dehydration process means caffeine anhydrous is more concentrated and, therefore, more potent than regular caffeine.

The Food and Drug Administration (FDA) warn against highly concentrated caffeine in powder and liquid forms.

The difference between safe and toxic amounts is minimal, and the product is difficult to measure using standard kitchen tools. One teaspoon of pure powdered caffeine, for example, contains the same amount of caffeine as 28 cups of coffee.

Therefore, people must be careful when it comes to the amount of caffeine they ingest. The following people in particular need to take care.

We've all "caught" yawning from other people, but why that happens is unclear, according to a psychologist who has researched the behavior.

"In short, we don't know why yawns are contagious," said Meredith Williamson, a clinical assistant professor at Texas A&M College of Medicine. "Researchers used to think that yawning was only signaling a need for sleep, but now they believe that it can communicate a shift in alertness or boredom."

One theory is that contagious yawning is related to empathy, and that people with higher levels of empathy yawn more often when someone else yawns, compared to people with lower levels of empathy or those with a mental disorder.

"Researchers have seen that yawning may not be as contagious to people with autism or schizophrenia," Williamson said in a university news release. "More research is being done to determine the cause of this."

She also noted that children under the age of 4 and older adults are less likely to yawn in response to somebody else yawning.

Yawning may be an unspoken form of communication, but it's not unique to people, Williamson added. Some species of primates and canines yawn in response to each others' yawns, and dogs will even yawn after a person yawns.

Yawning is "multifactorial. It could be partly an innate form of communication or it could be related to empathy, or a bit of both combined with other factors," she suggested.