Author Archives: laram05

Why do we crave?

With the Spring season beginning here in Vancouver, we know that soon enough it will be that time of the year to hit the beach and relax. For most girls and maybe some guys, this time of the year is known as swimsuit season in which the focus is not necessarily laying by the beach but it is on losing that final few pounds to look good in our bathing suits. For some, it is an absolute challenge to be on a diet and it definitely does not get any easier with all the food cravings that arouse in people.

The Monell Chemical Senses Center revealed that although almost anyone can get a food craving, there is a gender difference as 100% of females and 70% of males experienced a food craving in the past year. Also, in Europe and North America, women tend to crave sweets whereas men prefer savory foods; both of which are foods rich in fat and calories making it even more challenging for that diet. A geographical difference is also said to exist as women in Japan are more likely to crave sushi rather than the typical answer of chocolate we get here in Canada.

Resisting the Urge

Results of the most craved item from 1000 Canadian college students
Source: WSJ Reporting

Participants during a study in 2004 were asked to imagine their favorite food while connected to an MRI scanner. From the images, the caudate area of the brain lit up which controls the dopamine activity, a hormone produced during sexual and drug activity, as well as, gambling. Therefore, the pleasure and addictiveness of  these activities and certain food cravings are said to follow similar neural pathways.

So why are all of these foods high in fats and calories being craved? It is because the brain is given feelings of pleasure and euphoria when high amounts of the chemical opioid is released from the foods high in fat and sugar and enters the bloodstream. Researchers have also stated that when a person consumes too much foods high in fat and sugar the dopamine receptors tend to crash and shut itself down leading to fewer working dopamine and more cravings.

On a closing note, to help you reduce those cravings for the swimsuit season, here are a few tips from Jillian Michaels, personal trainer and reality show host of NBC’s  the Biggest Loser.

YouTube Preview Image YouTube account: EverydayHealth

-Maral Altanbadralt

Sonic Booms

Many people are aware of the meteorite that recently crashed into Earth in Russia. With the availability of video recording hand-held devices, as well as, dash-cam cameras on cars, videos of the meteorite sweeping across the sky are everywhere on the web.  There are reports of over 1000 injuries, many of which was due to the after effects of the sonic boom that took place from this meteor travelling at 33,000 miles per hour.

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Youtube Username: RussiaToday

So what causes a sonic boom? A sonic boom is best understood by the waves/wakes made by forward movements in water. When a pebble is thrown into the water, small circular waves form and move away from the center, as seen in the figure below. A slow moving boat in the water, causes the same waves to form and move away in front and behind the boat.

If the boat travels faster than the movement of the waves, then a wake is formed from all of the concentric circles coming together.

Image from howstuffworks.com

When a meteorite travels through the air, it forms sound waves similar to the last illustration of the above diagrams. A sonic boom takes place when the object travelling through the air moves faster than the speed of sound, which is 700 miles per hour (approximately 47 times less than the speed of the meteorite). The sonic boom can be considered as the wake that forms from the sound waves since all of the waves that should be in front of the moving object are joined together behind the object causing the sound to occur after the passing of the object.

-Maral Altanbadralt

End of the road for Gingers?

Should red heads around the world be in panic as reports of the extinction of their unique gene runs through the media? Should all gingers rush to mate with another ginger in fear of this theory?

The red hair gene first appeared thousands of years ago in northern Europe as a result of a genetic mutation in the MC1R gene. It was first reported that having the red headed gene increased the ability of the body to cope with sunlight as it allowed for more vitamin D in the body. However, carriers of the gene today are more sensitive to heat and cold, as well as, more likely to acquire skin cancer.

It is rare to spot red haired individuals; in fact, National Geographic reported that less than 2 percent of the world’s population today carries the gene for red hair. Genetic scientists are reporting that the “dying breed” will be basically extinct in the next 100 years. However, there seem to be experts that argue that the gene can merely be dormant for several generations before appearing once again.

Genetics at Work Image Gallery

The reason for the prediction of extinction is due the recessive nature of the gene. Both parents must pass on the recessive gene for the offspring to physically express red hair. However, we should all be aware that a couple does not have to both be red headed in order for their children to be the same. Two blondes, or brunettes also have the possibility of producing an offspring with that phenotype, as long as they are both heterozygous dominant for the gene.

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Therefore, while there is a chance for a decline of red headed populations due to lower chances of a red headed individual pairing with another red headed partner, the potential of having red hair will not go away. For now, it is too early to determine that extinction of all redheads will occur.

-Maral Altanbadralt