UC Food Blog
Do you know the difference between a yam and a sweetpotato?
“A true yam is not grown in the U.S., it's found in South America,” says Jason Tucker, vice president of the California Sweetpotato Council. Real yams have dry, dark flesh and are not the same plant species as sweetpotatoes, he explained.
“A yam is a sweetpotato, at least for those grown in the U.S.”, says Scott Stoddard, UC Cooperative Extension advisor in Merced County. “The rest of country has predominately just one type of sweetpotato, with tan skin and orange flesh, but in California, we have four marketing classes.”
The four kinds of California sweetpotatoes are
- Jewell, with tan skin and orange flesh
- Jersey, with light yellow skin and white flesh
- Oriental, with purple skin and white flesh
- Garnet, with red skin and deep orange flesh
The red-skinned sweetpotatoes are what many people in the United States call yams.
The California Sweetpotato Council spells sweetpotato as one word because it isn't a potato, it is a different plant species.
Studies have shown that we develop our eating habits early in life, according to lead author Lenna Ontai, UC Cooperative Extension specialist in the Department of Human and Community Development at UC Davis.
“We know that it is not enough to just teach parents what to do. We have to support them in how they can take that knowledge home and use it effectively,” said Ontai.
Healthy, Happy Families provides parents with practical information about how children develop and tips for raising a healthy and happy child. It includes fun and easy activities for parents to do with their preschool-aged children to promote healthful eating.
Children who spend more time with their parents tend to be happier and learn better, the authors write. They recommend eating together as a family to help children learn to make healthy food choices. Letting children help plan and prepare meals helps them develop new skills. Children also learn social skills during family meals such as talking and listening.
For cooking with kids, they recommend
- Explaining why it's important to wash our hands.
- Setting up an area for the child that is away from the stove and oven.
- Using a low table or safe step stool.
- Letting the child taste.
- Using child-sized utensils.
- And most of all, making it fun!
In a fun way, parents can create a healthy learning environment and teach their children healthful habits that will last a lifetime.
“Helping parents tune into their children's development and supporting positive interactions around food makes a big difference as children grow,” Ontai said.
The Healthy, Happy Families workbook is available in packages of 10 for $15 in English and is now available in Spanish as Familia sana, familia feliz in Spanish. There is also a companion publication for teachers called the Healthy, Happy Families for Teachers curriculum. All three publications can be ordered at http://anrcatalog.ucdavis.edu.
The award was presented to the Aggie inventors during the finals of the three-day global iGEM (International Genetically Engineered Machines) competition in Boston. The competition, this year featuring 245 teams from Asia, Europe, Latin America and North America, challenges student teams to design and build biological systems or machines and present their inventions in the international competition.
The students had spent several months designing and building the palm-sized biosensor, which they dubbed OliView. The biosensor is equipped to quickly and easily evaluate the chemical profile of oil, providing producers, distributors, retailers and ultimately consumers with an effective, inexpensive way to ensure olive oil quality.
Verifying olive oil quality is a concern for consumers – many of whom are willing to pay higher prices for the health benefits and flavor of true, extra-virgin olive oil. And honest olive oil producers want to prevent other producers from passing off sub-par olive oil as the real deal, while retailers, distributors and producers want a quick, easy way to ensure olive oil quality.
In addition helping detect fraudulent olive oil, the students' new biosensor will also monitor for good oil that may have gone rancid with age.
The team of undergraduate students included Lucas Murray, Brian Tamsut, James Lucas, Sarah Ritz, Aaron Cohen and Simon Staley, with Yeonju Song serving as the “shadow” or alternate team member. You can tune into Aaron Cohen's recent Nov. 6 Science Friday interview during a discussion of synthetic biology.
The full story and a brief video about the new olive-oil biosensor and this stellar team of young inventors are available at: http://news.ucdavis.edu/search/news_detail.lasso?id=11076.
Reports on olive-oil quality are available at the web site of the UC Davis Olive Center at: http://olivecenter.ucdavis.edu/research/reports.
One of the events that attendees could sign up for was lunch with a scientist at The Ohio State University, located a few miles away from the conference venue. I chose Prof. Jeffrey LeJeune, an infectious disease microbiologist and epidemiologist, because a focus of his research is food safety, one of the topics included in the UC Global Food Initiative that UC President Janet Napolitano launched on July 1.
On the day of the luncheon, a Sunday, we were driven to The Ohio State University in buses the university provided. We assembled in the lobby of the Ohio Union (it was homecoming on campus and the Columbus marathon was in progress nearby), and were soon escorted to the tables of the scientists we had picked. The university kindly (and safely!) provided lunch.
At LeJeune's table, we introduced ourselves to one another. LeJeune began his presentation to his 15 guests by rebuffing the five-second rule. According to this rule, food dropped on the ground will not become contaminated with bacteria if it is picked up within five seconds of being dropped. LeJeune said it does not work. “Eating off the floor violates all food-borne illness prevention advice,” he warned.
Perhaps because we in his audience were all science writers, he proceeded to discuss communication challenges facing scientists. He said most of the emphasis in graduate training is on making discoveries, with hardly any attention paid to communicating these discoveries in lay language to benefit the general public. Other challenges he mentioned are the information explosion we are witnessing, resulting in deaf ears turned to many scientists' voices; and language barriers between scientists and journalists that hinder effective communication.
“The pasteurization of milk was a huge benefit to the health of the human population,” he said. “Most cheeses in the U.S. are pasteurized cheese products.”
We asked him many questions. He answered them all. He explained that the U.S. has the safest food supply. Despite this, pathogens can enter the food chain through live animals, he cautioned. Further, refrigeration could be inadequate. He said about 80 percent of food and vegetable contamination occurs post-farm. His tip for what to eat when traveling: “Avoid raw or unpeeled foods. It is best to choose what is fully cooked and hot.”
LeJeune noted there is no evidence to suggest that GM foods are problematic from a food safety perspective.
“There are some concerns for sure,” he said. “But these are largely economic or political. Nutrition-wise, GM foods can be beneficial. From a food safety and nutritional standpoint, I also see no significant differences between organic produce and non-organic or regular produce. There could be, however, some environmental impacts related to the different production systems.”
More questions followed. A discussion on E. coli bacteria gathered momentum, specifically how E. coli gets infected with a virus and how, when this virus decides to leave E. coli, it releases Shiga toxins, which, in turn, damage cells lining the kidney.
We were so engrossed in the discussion that it came as a surprise when one of the organizers of the luncheon strode into the room to inform us that our hour with the scientist was up and that the bus that had transported us to The Ohio State University was about to leave.
As we rose hastily from our chairs we thanked LeJeune for his presentation, which was clear and to the point – qualities all science (and other) writers appreciate. We know he had other topics to discuss with us: Can I cook my Jack-o'-Lantern after Halloween? (The answer is “Not if it sits out for more than two hours.”) And are raw diets for dogs a public health concern for humans? (The answer is “Your dog is more likely to have Salmonella if it is eating raw food.)
Although we didn't get to these topics, he left us with ample useful information about food safety. On the ride back to the conference, the bus was loud with conversation from the various lunch groups – what had been learned, how best it could be communicated, and how each one of us had made a new friend at the university.
It's not too late to mix things up this year, by bringing one of many creative fruit and vegetable goodies to your spooky bash.
What about healthy ideas for children's parties? Think outside the wrapper! Consider handing out non-food items this Halloween. You can purchase many of these items for the same price as sweets. Pro tip: check out your local dollar store or hit up the party favor aisle at most department stores for bulk buys at low prices.
Here are a few non-food ideas:
- Spider rings
- Bouncy balls
- Sidewalk chalk
For more ideas about healthy holiday celebrations, visit ChooseMyPlate.gov, or contact your local University of California Cooperative Extension Nutrition Education Program.
Two creative and healthful Halloween party ideas.