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What makes for a gold-medal diet? That depends on what sport you're tackling.
Ever wondered what's on the menu at the Olympic Village? Read on.
February 14, 2018

ASU assistant professor and leading dietitian on Dutch Olympic Committee’s nutrition team says it depends on the athlete

The most-decorated Olympian of all time made headlines in 2008 for something other than his athletic prowess — or, ahem, lung capacity — when some outlets alleged Michael Phelps, the U.S. competitive swimmer, maintained a diet of 12,000 calories a day. Those reports turned out to be bogus, but it didn’t stop the public from wondering: Just what do Olympians eat? And how much, and how often?

According to Floris WardenaarFloris Wardenaar is an assistant professor of sports nutrition, working for both ASU's College of Health Solutions and Sun Devil Athletics., Arizona State University assistant professor of sports nutrition and a leading dietitian on the Dutch Olympic Committee’s nutrition team, it depends on the athlete. But generally, they’re encouraged to eat the same proteins, fruits, veggies and whole grains they usually do, and to adjust their intake based on their daily strength output needs.

“This is the most important game in the world, and of their life, probably,” Wardenaar said. “So they shouldn’t be eating anything other than what they’re used to.”

Before Wardenaar gave advice to Olympians on what to eat, he watched them on TV as a child in the Netherlands. His interest in performance nutrition grew when he began cycling competitively at the age of 14.

This year, he’s excited to see the historically high-performing Dutch speed skating team continuing to excel at their sport. But before the games got started last Friday and his attention was commandeered, he took the time to illuminate ASU Now on the business of chowing down, champion-style.

Editor’s note: The following responses have been edited for length and clarity.

ASU prof

Floris Wardenaar

Question: Who determines what the Olympians are eating?

Answer: Some countries — like for example, the U.S., Australia and the UK — have a close relationship with the Olympic organization and are able to provide input as far as food offerings at the Olympic Village. But mainly what those countries want is beneficial for everyone. Before the 2016 Summer Olympics in Rio, Aramark was the preferred supplier. They brought their own dietitians with them to the village, so if an athlete wanted, he or she could directly consult with them. But I know some teams bring their own; the U.S. always brings several sports dietitians with the team.

Q: Why do different athletes need different diets?

A: With hockey, for example, the kind of nutrition you need depends on the position you play. Most enforcers will have different intakes compared to the center. It depends on the focus of the athlete. For ski jumpers, they benefit from being as light as possible but when their diet is too restrictive, they also lose muscle mass and therefore jumping power. So it’s about fine-tuning their diet and varying the protein, carbohydrate and fat contents based on their needs. Some good basic advice is to eat lots of protein, fruits, veggies and whole grains.

Q: How does an athlete’s diet vary depending on whether they are training or competing?

A: All athletes nowadays focus on mealtime planning, having about five meals a day, with plenty of protein. Depending on if they’re training or competing, they may change the timing of their meals slightly to make sure that their fuel is fully loaded before a competition.

Most of the time they train two times a day. So that means they have a light breakfast, then during the training session probably something like water or a sports drink, depending on the intensity. Then after that, they will probably have a recovery shake or else something to eat for lunch. After that, most of the time they rest for one or two hours, then the next training session begins. So again, they’ll have a light snack before that and then something afterward — a meal-replacement shake or dinner — to help them recover. Depending on the preference of the athlete, they might also want to have a light evening snack before they sleep.

Q: What kind of food do most Olympians eat?

A: One of the basic rules is to eat what they normally eat. This is the most important game in the world, and of their life, probably. So they shouldn’t be eating anything other than what they’re used to. At the Olympics Village kitchen, they have choices between Western food, halal, Asian food, everything. And of course, Asian food will be very good this year. I don’t think Americans will be complaining because all the kinds of food preferences you find in the normal American diet, you can find there. Some teams bring their own food, though. One time we had fridges where we were staying stocked with yogurt for our athletes because the Netherlands is a dairy country.

Q: Any predictions for the upcoming games?

A: During the last Winter Games, the Dutch won almost all of the medals in speed skating, but that will probably not happen this year because that was exceptional. Actually, one of the reasons that happened was because the U.S. speed skaters were underperforming at that moment. But I think the U.S. will definitely win more medals this year. There’s also short-track speed skating, and the Netherlands are doing better and better at that. So that’s something I’ll watch as well. The Olympics is such a special event, so I’ll probably have the television on all day.

Top photo courtesy of

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ASU professor believes new bill will accelerate cryptocurrency's acceptance

February 14, 2018

State legislators pushing through a bill that would allow Arizona residents to pay taxes through cryptocurrency

Although known generally for conservative politics and practices, the Arizona Legislature is embracing innovation by welcoming cryptocurrency to its list of cutting-edge technologies.

Thanks to companies like Google/Waymo, LifeLock, Axon and Blackboard Learn, Arizona is a proven hot spot for innovators and entrepreneurs to start, expand and thrive. Now stepping further into the digital realm, Arizona lawmakers have passed a bill in the Senate to make cryptocurrencies such as Bitcoin and Dash an acceptable form of tax payment starting in 2020. The bill now heads to the House for consideration.

To discuss what this means for Arizona residents, ASU Now turned to Dragan Boscovic, an Arizona State University computer science professor and director of the Blockchain Research Lab.

Man in cap smiling

Dragan Boscovic

Question: Why do you think Arizona, a conservative state, has gone down this road?

Answer: Over the past few years Arizona has proactively engaged in becoming a favored partner for the new technologies, deliberately cultivating a live-lab testing environment in which technology innovations can be quickly tested for their latent business potential. This pragmatic approach holds the promise of generating a huge economic benefit to everyone. It is well known that Arizona attracted many autonomous car-driving companies by favoring business opportunities over heavy regulations, and we see the same scenario now being repeated with digital currency and blockchain technology in general. Consequently, Arizona and the Phoenix area in particular have emerged as a hot spot for blockchain service companies.

Q: How will this new development change the research in ASU’s Blockchain Research Lab?

A: This is a hugely positive development for BRL and blockchain-related activities at ASU in general. If the legislation is passed, it will further strengthen the mandate to initiate and perform first-class, quality research and innovations that enable efficient digital currency payment at scales comparable to conventional cashless payments. Furthermore … the demand for blockchain talent will grow exponentially, attracting new students to ASU and BRL to produce a new generation of blockchain application and business developers, and a cohort of blockchain-literate policy makers.

Q: What happens if the value of cryptocurrency changes between when you’ve filed your taxes to the time the state receives payment?

A: This is a small risk to bear for the current volumes of digital currency transactions, and potential economic development benefits outweigh the associated risks. As the volume of transactions grows, the value of digital currency is less prone to large daily changes, lowering the associated exchange risks.

Q: What kind of infrastructure changes will be needed on behalf of the state to start accepting payment, especially since it appears they’ll accept a range of cryptocurrencies?

A: The state will need to build a digital payment gateway to link its existing accounting and payment processing system to the digital currency networks will accept. To start, they will need a payment gateway toward Bitcoin, but the same principle can be used to design and operate payment gateways for other major digital currencies like Dash and Ethereum.

From a user-experience perspective, it can be very similar to the PayPal option we use when shopping online. Instead of PayPal it would be simply Bitcoin, Dash or something else.

Q: If this method is successful, do you think the IRS will follow suit one day?

A: As the volume of digital currency transactions grows, so will their acceptance increase. We are still in very early stages, and the financial regulatory framework will need to evolve in order to support acceptance of digital currencies. It might take a few years and input from early adopters like Arizona to design that framework, but once it is in place my expectation is that the IRS will start accepting digital currency payments as well.