Dispelling nutrition myths, ranting, and occasionally, raving


Eating to change your eye colour


I recently came across a post by David Wolfe (yeah, that guy) about the ability of a raw food diet to change your eye colour.

Apparently this is a thing ever since some raw food guru nutritionista chick made the claim that after changing from an unhealthy diet she cleared-up her constipation and her brown eyes became hazel/green.

Naturally I was skeptical. Even David Wolfe was. Yet, he somehow came to the conclusion that it was possible based on this article. The thing is, the article doesn’t actually support the claim that a raw food diet can change a person’s eye colour. It says that eye colour can change as we age, but this is generally referring to children, not adults and is unrelated to diet. It then carries on to state that significant changes in eye colour may be the result of a disease and anyone experiencing such changes should see an eye doctor. No mention of diet.

I did a little googling and found some other articles. None of which were written by anyone with any medical knowledge of eyes. Wolfe and this Vice article both mention “iridologists” which is pretty ridiculous. Iridologists are to optometry what phrenologists are to neurology. Essentially a great source of perhaps entertaining information but otherwise quackery. To be fair, even these iridologists seemed to think the notion of changing ones eye colour via diet was farfetched. Everything I could find through the googles was anecdotal.

I feel the need to voice my disappointment in seeing a dietitian’s name continually come-up in connection with this raw food eye colour change business. As dietitians we are obligated to provide evidence-based dietary advice. Neither advising people to choose a diet to change their eye colour, nor advocating for raw food diets for all are ethical for a member of our profession.

Next I turned to google scholar. Again, nothing. There is absolutely no scientific evidence of a relationship between diet and eye colour. Of course, it’s possible that, that research just hasn’t been done. And I will be happy to revise this post if a study is ever published showing that eye colour can be changed by switching to a raw food diet.

Even if eye colour can be changed by diet, who cares?! I mean, seriously. Having brown eyes does not mean that you eat unhealthily and are constipated. Having blue eyes doesn’t mean that you’re healthy and having regular bowel movements. Are we now judging a person’s health and habits based on eye colour? Could we get anymore superficial? Why would we want to go on an extreme diet just for the purpose of changing the colour of our eyes? A raw diet is not necessarily the healthiest choice. There are many reasons that we cook our food: to kill toxins and microorganisms, to increase absorption of nutrients, to improve palatability. Personally, I would rather keep my grey/blue eyes and enjoy my food.


Supplements: Should I take truBrain drinks?

I guess promoted tweets do come in handy every now and again. Blog fodder. This tweet appeared in my feed last week:


Naturally, my response was: that sounds like complete and utter bullshit.

I went to their website to look for the science to back-up their claims; i.e. an increase in productivity. Naturally, the truBrain research team conducted the study. Surely no bias there. The study itself? Seven. Yep, seven, participants were examined for changes in EEG results following one week of truBrain consumption. The EEG was used to measure brain activity. There was no control group and no blinding (read: high likelihood of bias). Even with the deck so well stacked in their favour, the “researchers” found no significant results at a group level. This pilot study is the only research cited on their website.

Okay, so there’s no real science to support the claim that truBrain can increase productivity. Perhaps a look at the ingredients can provide more illumination:

375 mg of CDP-Choline – The lovely folks at examine.com indicate that there is some minor evidence to support the use of CDP-Choline to support memory and attention, and decreased cognitive decline in older adults. If there is a benefit conferred by CDP-Choline, this might be an effective dose.

200 mg of DHA – This is an omega-3 fatty acid. There may be benefits seen at this dose, although there is no scientific consensus. Also, benefits are most likely seen in individuals who do not regularly consume fatty fish.

375 mg of L-carnitine – This is quite a low dose. While there is some limited research to support the use of L-carnitine to increase cognition in the elderly, there is no research to support its use in the young.

300 mg of L-theanine – This is an amino acid that may promote relaxation. There is no research supporting its use to improve cognition.

375 mg of L-tyrosine – Another amino acid. As a supplement, it may reduce stress and memory in the presence of an acute stressor.

120 mg of magnesium- Many of us don’t consume enough magnesium in our diets so it’s hard for me to knock the inclusion of this mineral in their beverage. However, this is a rather low dose. Some forms of magnesium can cause gastrointestinal distress and diarrhea. It’s also important to note that magnesium supplementation is unlikely to have any effect on cognitive performance.

800 mg of oxiracetam – This is a mild stimulant that may improve memory but there aren’t currently human studies to support this.

In addition to the “medicinal” ingredients, truBrain drinks also contain the following “natural” sweeteners: pomegranate, stevia, blue agave, cranberry, sugar cane, and monk fruit. Six sweeteners. Sweet enough for ya? Not mentioned in any of the ingredient lists is caffeine. The website shows an option for purchasing “non-caffeine drinks” but at the moment they have not yet developed any.

At the low end of the scale you can purchase 15 drinks for a one time fee of $60 or $50 per month. That’s $4 per packet. Unfortunately, the website doesn’t clearly state the size of each drink packet nor the full ingredient list or nutrition information. Without complete information, I can’t completely rip these truBrain supplements to shreds.

Apparently these supplements were developed by neuroscientists. While this might seem to lend an air of believability to their claims, it truly only shows that no profession is exempt from quackery and the desire to turn a profit.


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The tooth-whitening power of raisins!

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I feel like this shouldn’t need any comment. When I saw this tweet my first thought was: @DrOz has been hacked! I mean, really? Raisins for white teeth? This is one of the most ludicrous suggestions I’ve ever heard. I’m fairly confident that any dentist would agree with me when I say that raisins will not whiten your teeth. Raisins, and other dried fruit, actually promote tooth decay as they’re sweet and sticky.

Besides all that, will antioxidants whiten teeth? Not that I’m aware of (that’s not to say they won’t). In fact, hydrogen peroxide (one of the most common whitening ingredients in toothpastes, mouthwashes, and home-whitening kits) is actually an oxidizer.