Deze vijf voedselproducten houden je darmflora gezond
Knoflook, prei, ui, paardenbloemblaadjes en aardperen zijn de meest prebiotica-rijke soorten voedsel die je kunt eten. Door veel prebiotica ...
John Gieng
Om erachter te komen welke soorten voedsel de meeste prebiotica bevatten, keken voedselwetenschappers Cassandra Boyd van de Openbare Universiteit San José in de Verenigde Staten en haar collega <anchor>John Gieng</anchor> naar zeventig wetenschappelijke publicaties over prebiotica in voedsel. Negen hiervan bevatten voldoende data om meegenomen te worden in hun analyse. Met behulp van deze negen studies analyseerden ze de hoeveelheid prebiotica in 8690 voedselproducten.
John Gieng, PhD | People | San Jose State University
John Gieng, PhD \| People \| San Jose State University

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[**John Gieng, PhD**](/people/john.gieng) San José State University

## Site Navigation

- [**Research**](/people/john.gieng/research/)

- [**Publications**](/people/john.gieng/publications/)

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- [**Guide to Joining My Research Group**](/people/john.gieng/join/)

- [**Media**](/people/john.gieng/media/)

- [**Requesting a Letter of Recommendation**](/people/john.gieng/LOR/)

- [**Academic Advising**](/people/john.gieng/advising/)


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# John Gieng, PhD

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- [Guide to Joining My Research Group](/people/john.gieng/join/)
- [Media](/people/john.gieng/media/)
- [Requesting a Letter of Recommendation](/people/john.gieng/LOR/)
- [Academic Advising](/people/john.gieng/advising/index.html)

![Gieng profile picture](/people/john.gieng/pics/Gieng2020.jpg)


Associate Professor of Nutritional Sciences

General Education Program Coordinator

[Department of Nutrition, Food Science & Packaging](https://www.sjsu.edu/nufspkg/)

## Contacting Me

- **You can reach me** at [john.gieng@sjsu.edu](mailto:john.gieng@sjsu.edu). Be sure to include sufficient detail when sending me any messages.
- **Students taking my classes** can see me during office hours. Please refer to the course syllabus for the specific
day and time to set up an appointment (a link is provided in the [course Canvas site](https://sjsu.instructure.com/)).
- **Students interested in working with me** should [review the guide to joining my research group](/people/john.gieng/join/).
- **Students requesting a letter of recommendation** should [review this guide](/people/john.gieng/LOR/).
- **Students requesting academic advising** should [review this page](/people/john.gieng/advising/).

## Education

- _Postdoctoral Fellow_, Center for Nutrition & Metabolism, Children's Hospital Oakland Research Institute
(now [UCSF Benioff Children's Hospitals](https://www.ucsfbenioffchildrens.org/) - [MLK Laboratory Research Facility](https://bchdean.ucsf.edu/research-facilities))
- _Doctor of Philosophy_, [Nutritional Sciences, The Pennsylvania State University](http://nutrition.hhd.psu.edu/ "Nutritional Sciences")
  - _Doctoral Minor_, [Physiology, The Pennsylvania State University](http://bio.psu.edu/directory/research-areas/physiology "Physiology")
- _Bachelor of Science_, [Nutritional Sciences, Emphasis in Physiology and Metabolism, University of California,\
Berkeley](https://nst.berkeley.edu/ "Nutritional Sciences")

## Licenses and Certificates

- National Certified Phlebotomy Technician, CPT-1, since 2023

- CPR-Basic Life Support, American Heart Association, since 2023

- X-Ray Bone Densitometry (DXA) Technician, since 2018

## Bio

Dr. John Gieng is a researcher who has studied nutrition in a variety of settings,
including in the lab and in the community. He has used both _in vitro_ and _in vivo_ models, such as human and animal cell culture, rodents, and humans, in his work.
His earlier research examined the effects of inflammation on the body's use of vitamin
A, using mathematical modeling to better understand how nutrient deficiencies and
disease can interact. Later, he focused on studying the role of gut microbiota in
host health and diet-induced obesity, as well as the potential for teenagers to teach
elementary school students about nutrition through a garden-based education program
and how this can improve the teenagers' self-efficacy and ability to live a healthy
lifestyle. At San José State University, Dr. Gieng combines his expertise in human
metabolism, mammalian physiology, and applied nutrition education in his teaching
and research.

Currently, Dr. Gieng's research centers on evaluating and improving health and performance
through sustainable diets and behaviors. His research has three main areas of focus:

1. Evaluating the nutritional quality of sustainable foods and their impact on health.
2. Examining the impact of diet on health and related behaviors and programs using biotechnology.
3. Investigating the relationships among nutrition, metabolism, body composition, health,
    and performance.

To learn more about Dr. Gieng's work, go to the [Research](/people/john.gieng/research/) and [Publications](/people/john.gieng/publications/) pages.

**Faculty Insights interview in fall 2021:**

## Links

Twitter: [@jgieng](https://twitter.com/jgieng "Twitter")

LinkedIn: [@johngieng](https://www.linkedin.com/in/johngieng/ "LinkedIn")

Instagram: [@john.gieng](https://www.instagram.com/john.gieng/ "Instagram")

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