Dr Silvia Gratz

Dr Silvia Gratz
Dr Silvia Gratz
Dr Silvia Gratz

Senior Research Fellow

Accepting PhDs



I have obtained my MSc in Human Nutrition from the University of Vienna, Austria (2002) and my PhD in Food Toxicology from the University of Kuopio, Finland (2007). I have joined the Rowett Institute as a Post-Doctoral Research Fellow and am now a Principal Investigator in the Gut Health group.

Memberships and Affiliations

Internal Memberships

Co-lead of the Equality, Diversity and Inclusivity Team (Rowett Institute)

Member of the Athena Swan Self-Assessment Team (School of Medicine, Medical Sciences and Nutrition)

Member of the Human Studies Ethics Review Panel (Rowett Institute)

Member of the Organising Committee of the International Gut Microbiology Symposium series

External Memberships

Member of the FSA Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment (since 2022)

Editorial board member Frontiers in Predictive Toxicity (since 2010)


Research Overview

Impact of diet on intestinal metabolism and gut toxicity

There is strong evidence that our diet influences the healthy function of our intestinal tract. Besides the healthy nutrients, some toxins and carcinogens may also be present in the food we eat and additional toxic compounds can be formed or released by intestinal microbiota.

In my research group we study mycotoxins, which are toxins produced by some specific moulds growing on agricultural crops. We assess the levels of mycotoxins in foods and human exposure to these dietary toxins.

Furthermore we look at how carcinogenic compounds are formed in the gut following high consumption of red meat, and how dietary fibre and Vitamin C can prevent their formation.

This work directly benefits consumers by providing evidence on healthy and safe diets. Read more here

Research Areas

Accepting PhDs

I am currently accepting PhDs in Nutrition and Health, Biomedical Sciences.

Please get in touch if you would like to discuss your research ideas further.

Email Me

Nutrition and Health

Accepting PhDs

Biomedical Sciences

Accepting PhDs

Current Research

My research investigates the role of the gut microbiota and microbial metabolites derived from dietary components on the health and function of the intestinal epithelium.

In one project we study the role of gut microbiota in the degradation of masked mycotoxins and the detoxification of mycotoxins. This activity of microbiota is important as it releases additional bound mycotoxins into the large intestine. Furthermore we assess human exposure to mycotoxins to estimate the level of potential risk for consumers. For this work we use urinary mycotoxin excretion as biomarker in humans and also analyse cereal foods and raw materials for potential contamination.

Another project assesses the effect of diet composition on microbial metabolites derived from carbohydrate and protein metabolism (e.g. butyrate, ammonia, nitrosamines) and their effects on the intestine. In human intervention studies our volunteers consume diets with different levels of carbohydrate, protein and meat and we measure microbial metabolites in human faecal samples.

Research Team

Ms Margaret-Jane Gordon – Research Assistant

Mr Edward Devlin – PhD student

Ms Nikoleta Boteva – Post-doctoral researcher

Funding and Grants

  • Scottish Government RESAS funded programme (2022-2027): Evaluation & mitigation of mycotoxin contamination across the Scottish cereal supply chain to assess human exposure & inform risk analysis. Gratz (PI).

  • Probi AB funded research project (2021-2024): Investigating new candidate probiotic strains. Scott & Gratz (Co-I).

  • NC3Rs funded PhD studentship grant (2019-2023): Modelling Candida albicans infection of the human gut using human intestinal organoid cultures. Gratz (PI), MacCallum, Munro.

  • TENOVUS funded research grant (2018-2021): Application of human intestinal organoids to study food-derived risk factors for inflammatory bowel disease. Gratz (PI).

  • MRC funded research grant (2019-2020): Mycotoxin exposure, intestinal inflammation and childhood stunting in India. Gratz (PI), Kyle, Poobalan, DeRoos.

  • Interface Multiparty funded research grant (2019-2020): Investigating the risk of mycotoxin contamination as an emerging issue for Scottish oat production. Gratz (PI).

  • Probi AB funded research project (2017-2020): Isolation of gut bacteria. Scott & Gratz (Co-I).

  • Scottish Government themed programme (2016–2022): Chemical contaminants in the food chain, human exposure & intestinal toxicity. Gratz (PI).

  • Scottish Universities Life Sciences Alliance funded Early career X-change grant (2016). Molecular mechanisms of mycotoxin toxicity towards intestinal cell systems. Gratz (PI). 

  • DEFRA Food Standards Agency funded research grant (2014-2015): Evaluation of masked mycotoxins in foods and their release and uptake in the gut. Gratz (Co-I). Joint with FERA ltd, York, UK.

  • Agriculture & Horticulture Development Board funded PhD studentship grant (2013-2016): Application of association mapping and genomic sequencing to starch and GI in potato. Joint with The James Hutton Institute, Dundee, UK.

  • EU FP7 collaborative project SATIN - Satiety Innovation (2012–2016).

  • Scottish Government themed programme (2011–2016).


Teaching Responsibilities

Course coordinator for MSc courses

  • Clinical Nutrition, 2018-present
  • Foundations of Human Nutrition, 2016-2018

Lecturing in several courses within the MSc Programme Human Nutrition

Tutor in Research Skills for Medical Sciences (BSc)

Associate Fellow of the Higher Education Academy


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  • Butyrate-producing bacteria as probiotic supplement: beneficial effects on metabolism and modulation of behavior in an obesity mouse model

    Garcia-Serrano, A. M., Skoug, C., Axling, U., Korhonen, E. R., Teixeira, C., Ahrén, I. L., Mukhopadhya, I., Boteva, N., Martin, J., Scott, K., Gratz, S., Stenkula, K. G., Holm, C., Duarte, J. M.
    Working Papers: Preprint Papers
  • Free and Modified Mycotoxins in Organic and Conventional Oats (Avena sativa L.) Grown in Scotland

    Daud, N., Currie, V., Duncan, G., Filipe, J. A. N., Yoshinari, T., Stoddart, G., Roberts, D., Gratz, S. W.
    Toxins, vol. 15, no. 4, 247
    Contributions to Journals: Articles
  • Comparison of microbial signatures between paired faecal and rectal biopsy samples from healthy volunteers using next-generation sequencing and culturomics

    Mukhopadhya, I., Martin, J. C., Shaw, S., McKinley, A. J., Gratz, S. W., Scott, K. P.
    Microbiome, vol. 10, no. 1, 171
    Contributions to Journals: Articles
  • Higher total faecal short chain fatty concentrations correlate with increasing proportions of butyrate and decreasing proportions of branched chain fatty acids across multiple human studies

    Scott, K., LaBouyer, M., Holtrop, G., Horgan, G., Gratz, S., Belenguer, A., Smith, N., Walker, A., Duncan, S., Johnstone, A., Louis, P., Flint, H. J.
    Gut Microbiome, vol. 3, e2
    Contributions to Journals: Articles
  • Microbiota release of bound mycotoxins contributes to human exposure: in vitro and in vivo evidence

    Daud, N., Watt, O., Currie, V., Duncan, G., Russell, W., Gratz, S.
    Toxicology Letters, vol. 350, no. S, pp. S230-231
    Contributions to Journals: Abstracts
  • Gut microbiota metabolise food-derived mycotoxins

    Daud, N., Currie, V. J., Duncan, G., Gratz, S. W.
    Proceedings of the Nutrition Society, vol. 80, no. OCE2, 57
    Contributions to Journals: Abstracts
  • Prevalent Human Gut Bacteria Hydrolyse and Metabolise Important Food-Derived Mycotoxins and Masked Mycotoxins

    Daud, N., Currie, V., Duncan, G., Farquharson, F., Yoshinari, T., Louis, P., Gratz, S.
    Toxins, vol. 12, no. 10, 654
    Contributions to Journals: Articles
  • Nondigestible Carbohydrates Affect Metabolic Health and Gut Microbiota in Overweight Adults after Weight Loss

    Johnstone, A. M., Kelly, J., Ryan, S., Romero-Gonzalez, R., McKinnon, H., Fyfe, C., Naslund, E., Lopez-Nicolas, R., Bosscher, D., Bonnema, A., Frontela-Saseta, C., Ros-Berruezo, G., Horgan, G., Ze, X., Harrold, J., Halford, J., Gratz, S. W., Duncan, S. H., Shirazi-Beechey, S., Flint, H. J.
    The Journal of Nutrition, vol. 150, no. 7, pp. 1859-1870
    Contributions to Journals: Articles
  • Comparison of meat versus soya based high-protein diets on faecal microbiota and microbial metabolites

    Gratz, S. W., Scobbie, L., Richardson, A. J., Zhang, X., Fyfe, C., Farquharson, F. M., Duncan, G., Filipe, J., Zhu, W. Y., Johnstone, A. M., Louis, P., Russell, W. R.
    Proceedings of the Nutrition Society, vol. 79, no. OCE3
    Contributions to Journals: Abstracts
  • Intestinal hydrolysis and microbial biotransformation of diacetoxyscirpenol-α-glucoside, HT-2-β-glucoside and N-(1-deoxy-d-fructos-1-yl) fumonisin B1 by human gut microbiota in vitro

    Daud, N., Currie, V., Duncan, G., Busman, M., Gratz, S. W.
    International Journal of Food Sciences and Nutrition, vol. 71, no. 5, pp. 540-548
    Contributions to Journals: Articles
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Chapters in Books, Reports and Conference Proceedings

Contributions to Journals

Working Papers