Clay Swackhamer- Doctor of Philosophy
- Research Associate at Oregon State University
Clay Swackhamer
- Doctor of Philosophy
- Research Associate at Oregon State University
Researching the effect of dietary fiber structure on the taxonomic composition of the gut microbiome
About
16
Publications
3,572
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187
Citations
Introduction
I am a postdoc at Purdue in the department of Food Science supervised by Prof Bruce Hamaker. Our project is investigating the effect of dietary fiber structure on the taxonomic composition of the gut microbiome. My funding is from a 2-year postdoctoral fellowship through USDA-NIFA.
Current institution
Additional affiliations
August 2022 - present
Position
- Postdoctoral researcher
Description
- I am a postdoc at Purdue in the department of Food Science supervised by Prof Bruce Hamaker. Our project is investigating the effect of dietary fiber structure on the taxonomic composition of the gut microbiome. My funding is from a 2-year postdoctoral fellowship through USDA-NIFA.
July 2016 - August 2022
Position
- PhD Student
Description
- -Researching mechanisms of food structural breakdown during mastication and digestion -Supervised by Prof Gail Bornhorst
Education
August 2016 - February 2022
August 2011 - December 2015
Publications
Publications (16)
Foods are broken down during oral processing, which for solid foods often involves fracture. The aim of this article is to review previous research applying fracture mechanics to mastication, the effect of selected physiological variables on the fracture of foods in the mouth, and certain experimental methods that can be used to quantify the fractu...
Previous studies have shown that the size of almond particles influences lipid bioaccessibility during digestion. However, the extent of structural breakdown of almond particles during gastric digestion and its impact on lipid bioaccessibility is unclear. In this study, in vitro digestion of almond particles was conducted using a dynamic model (Hum...
Consumption of traditional West African pearl millet (Pennisetum glaucum) couscous delayed gastric emptying in our recent human study compared to other starch-based foods (white rice, boiled potatoes, pasta). The objective of this study was to determine whether physical properties of pearl millet couscous affect particle breakdown and starch hydrol...
Standardized, model solid foods were developed with varying initial hardness and breakdown rates during in vitro digestion. One class of model foods was based on the Standard American Diet, with strong and weak gel versions created by modulating pH. Another class was developed using whey protein hydrogels, with strong and weak gel versions produced...
Gastric secretions are crucial for food breakdown during digestion. Changes in intragastric pH due to gastric secretions are influenced by meal properties, such as composition, particle size, structure, buffering capacity, and mixing of the meal with gastric secretions. The use of in vitro digestion models has increased recently, however more physi...
Background/objectives
Increasing the energy density of porridges could help meet the needs of moderately malnourished, stunted children. However, it is not clear whether stunted toddlers can adequately digest and obtain energy from energy-dense porridges with thick texture. A clinical study was conducted in Bamako, Mali, using ¹³C-labeled substrate...
Purpose
Superior metabolic flexibility, or the ability to efficiently switch between oxidation of carbohydrate and fat, is inversely associated with obesity and type 2 diabetes. The influence of dietary factors on metabolic flexibility is incompletely understood. This study examined the impact of dietary carbohydrate digestion rate on metabolic fle...
Many existing in vitro digestion systems do not accurately represent the peristaltic contractions of the gastrointestinal system; most of the systems that have physiologically-relevant peristaltic contractions have low throughput and can only test one sample at a time. A device has been developed that provides simulated peristaltic contractions for...
Superior metabolic flexibility, or the ability to efficiently switch between oxidation of carbohydrate and fat, is inversely associated with obesity and type 2 diabetes. This study examined the impact of dietary carbohydrate digestion rate on metabolic substrate utilization and metabolic flexibility. We employed percent relative cumulative frequenc...
Due to the COVID-19 induced campus closure in spring of 2020, a large enrollment introduction to engineering design course was offered remotely, for the first time, at the University of California, Davis. Emergency circumstances necessitated a rapid re-design of the quarter-long course, with little more than a week to prepare. Despite the instructo...
In a previous trial in Mali, we showed that traditional pearl millet couscous and thick porridge delayed gastric emptying (about 5 h half-emptying times) in a normal-weight population compared with non-traditional carbohydrate-based foods (pasta, potatoes, white rice; about 3 h half-emptying times), and in a gastric simulator we showed millet cousc...
Objective
Liquid thickeners are commonly recommended in individuals with dysphagia and recurrent aspiration as a strategy for pneumonia prevention. The goal of this study was to examine the effects of small amounts of aspirated liquid thickener on the lungs.
Study design
Animal model. Prospective small animal clinical trial.
Methods
Adult Sprague...
The impact of feedstock characteristics (moisture content, additive content) and operational parameters (die temperature, pelletizer speed) on pellet quality, plugging tendency, and pelletizer energy use was investigated for a small-scale pelletizer, suitable for on-farm use (textasciitilde70 kg h-1 rated output). Ground switchgrass () was prepared...
