(P1) Consuming dairy cheese instead of other sodium-laden foods may actually protect against some of sodium’s effects on the cardiovascular system, such as high blood pressure, according to researchers at Penn State.
(P2) The researchers say the protection comes from antioxidant properties of dairy proteins in cheese.
(P3) “This is a novel finding that may have implications for dietary recommendations. Newer dietary recommendations suggest limiting sodium, but our data suggest that eating sodium in the form of a dairy product, such as cheese, may be protective,” said Lacy Alexander, associate professor of kinesiology and co-lead researcher on the project.
(P4) “We are already aware that at the population level, people who eat more dairy typically have lower blood pressure,” Alexander added.
(P5) The data suggest that when sodium is consumed in cheese it does not have the negative vascular effects that researchers observed with sodium from non-dairy sources. The researchers interpret this to mean that the proteins and nutrients in cheese may be protecting the blood vessels from the short-term negative effects of sodium. However, it is not known if this protection extends over the long term.
(P6) For the study, Alexander and colleagues fed participants dairy cheese, pretzels, or soy cheese on five separate occasions, three days apart. They then compared the effects of each food on the cardiovascular system using a laser-Doppler, which shines a weak laser light onto the skin.
(P7) The laser light reflects off red blood cells that flow through the vessels just under the skin, allowing researchers to measure how much the blood vessels dilate in response to skin warming and how much of that dilation is due to the production of nitric oxide, a gas that’s naturally produced in the body to deliver messages between cells.
(P8) The goal was to compare the effect of short-term dairy-cheese consumption to sodium consumption from non-dairy sources.
(P9) Soy served as an additional control to match the fat, salt, and protein content from a dietary source that is not dairy-based.
(P10) “We found that when our subjects ate a lot of sodium in cheese, they had better blood vessel function, more blood flow, compared to when they ate an equal amount of sodium from non-dairy sources, in this case, pretzels and soy cheese,” said Anna Stanhewicz, co-investigator and postdoctoral fellow in the Center for Healthy Aging.
(P12) “We know that more red blood cells mean more blood flow and more dilation. We observed that subjects had more nitric oxide-moderated dilation after eating dairy cheese, compared to after eating pretzels or soy cheese.”
(P13) The researchers reported their findings in the British Journal of Nutrition. Other researchers involved included Billie Alba, a pre-doctoral student in the Department of Kinesiology, and W. Larry Kenney, professor of kinesiology and Marie Underhill Noll Chair in Human Performance.
(P14) An ongoing follow-up study tests the same effects over a longer period of time.
VOCABULARY: cardiovascular, antioxidant, kinesiology, dilate, fellow (postdoctoral)
If you found the passage difficult to read or had problems understanding specific words or idiomatic expressions, please discuss them with your tutor. The following discussion questions should be answered in your own words and with your own arguments.
- Briefly, summarize the content of the article in your own words.
- Name some types of cheeses people consume in your country.
- Do you think it’s important to obtain a doctorate’s degree? Why or why not?
- Do you think it’s important to study the effects of diary-cheese products and non-dairy cheese products in humans? Why or why not?
READING COMPREHENSION QUESTIONS:
- What’s the name of the organization that performed the research?
- Eating cheese will definitely protect people from cardiovascular diseases like high blood pressure. (T or F)
- The aim of the research was to compare long-term consequences of eating diary-cheese to non-diary foods. (T or F)
- What’s the name of the person from the Center for Healthy Aging?
- Billie Alba is not a postdoctoral student. (T or F)
EXPRESSIONS or PHRASES:
What do the following expressions or phrases mean?
- a novel finding (P3)
- if this protection extends over the long term (P5)
- reflects off red blood cells (P7)
- soy served as an additional control (P9)
- an ongoing follow-up study (P14)