PD Dr. med. habil. Ann-​​Kathrin Lederer

Senior Physician

Head of the Department of Integrative Medicine | Specialist in Visceral Surgery | Additional qualification in Emergency Medicine |

Visiting Professor of Gender-Sensitive Medicine at the Faculty of Medicine, Martin Luther University Halle-Wittenberg

Email: Ann-Kathrin.Lederer@uniklinik-ulm.de

 

Clinical specialisms:
  • Oncological and non-oncological conditions in general and visceral surgery
  • Prevention of post-operative complications and sequelae
  • Patient-centred and gender-sensitive treatment approaches
  • Lifestyle and prevention
Research areas:
  • Methods of integrative medicine
  • Holistic treatment approaches
  • Changes in the gut microbiome
  • Plant-based diets
Qualifications:
  • Specialist in Visceral Surgery
  • Specialist qualification in emergency medicine
  • Principal investigator for clinical trials

  • Since August 2026: Senior Physician and Head of Department
    Department of General and Visceral Surgery, Division of Integrative Medicine, Ulm University Hospital, Prof. Dr N. Rahbari

  • Since November 2025: Senior Physician and Deputy Head of Department
    Department of General and Visceral Surgery, Division of Integrative Medicine, Ulm University Hospital, Prof. Dr N. Rahbari

  • Since January 2017: Head of the ‘Integrative Surgery’ research group
    University Centre for Naturopathy, Department of Internal Medicine II, University Hospital Freiburg

  • 2023–2025: Specialist in Visceral Surgery

  • Department of General, Visceral and Transplant Surgery, Mainz University Medical Centre, Prof. Dr H. Lang

  • 2017–2019: Medical staff member in the consultation and outpatient service
    University Centre for Naturopathy, Internal Medicine II, Freiburg University Hospital, Prof. Dr R. Huber

  • 2014–2023: Doctor undergoing specialist training in visceral surgery
    2022 to 2023: Department of General, Visceral and Transplant Surgery, Mainz University Medical Centre, Prof. Dr H. Lang
    2020 to 2022: Department of Surgery, Diakonie Hospital Freiburg, Prof. Dr B. Rumstadt
    2014 to 2016: General and Visceral Surgery, University Medical Centre Freiburg, Prof. Dr Dr U. T. Hopt

  • Wetzel S, Kohnert E, Huber R, Müller A, Knott A, Kousoulas L, Kreutz C, Badr MT/Lederer AK
    Divergent Resilience of Bacterial and Fungal Gut Microbiota after Colorectal Surgery: Insights from a prospective longitudinal cohort study MedComm.
    2026 May 26;7(6):e70781.
    doi: 10.1002/mco2.70781

  • Lederer AK, Görrissen N, Klein AC, Huber R, Badr MT. 
    Supportive Therapie der Dysbiose. 
    Coloproctology – ISSN 0174-2442. 
    doi: 10.1007/s00053-026-00945-1

  • Lederer AK, Görrissen N, Nguygen TT, Kreutz C, Rasel H, Bartsch F, Lang H, Endres K. 
    Exploring the effects of gut microbiota on cholangiocarcinoma progression by patient-derived organoids
    J Transl Med – ISSN 1479-5876. 2025 Jan 9;23(1):34.
    doi: 10.1186/s12967-024-06012-x

  • Lederer AK, Rasel H, Kohnert E, Kreutz C, Huber R, Badr MT, Dellweg PKE, Bartsch F/Lang H.
    Gut Microbiota in Diagnosis, Therapy and Prognosis of Cholangiocarcinoma and Gallbladder carcinoma – a scoping review
    Microorganisms – ISSN 2076-2607. 2023 Sep21;11(9):2363.
    doi: 10.3390/microorganisms11092363

  • Lederer AK, Samstag Y, Simmet T, Syrovets T, Huber R.
    Complementary Medicine Usage in Surgery: A cross-sectional Survey in Germany 
    BMC Complement Med Ther - ISSN 2662-7671. 2022 Oct 11;22(1):263. 
    doi: 10.1186/s12906-022-03746-3

  • Winter AS/Haverkamp C, Gratzke C, Huber R, Lederer AK.
    Valerian and postoperative sleep: A retrospective cohort analysis of gynecological, urologic and general surgical patients
    SLEEP – ISSN 0161-8105. 2022 Oct 10;45(10):zsac122.
    doi: 10.1093/sleep/zsac122

  • Lederer AK, Baginski A, Raab L, Joos S, Valentini J, Klocke C, Samstag Y, Hübner K, Andreeva I, Simmet T, Syrovets T, Hafner S, Freisinger A, Storz MA, Huber R. 
    Complementary medicine in Germany: a multi-centre cross-sectional survey on the usage by and the needs of patients hospitalized in university medical centers.
    BMC Complement Med Ther - ISSN 2662-7671. 2021 Nov. 23. 21(1):285.
    doi: 10.1186/s12906-021-03460-6

  • Kohnert E, Kreutz C, Binder N, Hannibal L, Gorkiewicz G, Müller A, Storz MA, Huber R, Lederer AK.
    Changes in Gut Microbiota after a Four-Week Intervention with Vegan vs. Meat-Rich Diets in Healthy Participants: A Randomized Controlled Trial.
    Microorganisms – ISSN 2076-2607. 2021 Mar 31. 9(4):727. 
    doi: 10.3390/microorganisms9040727.

  • Lederer AK, Maul-Pavicic A, Hannibal L, Hettich M, Steinborn C, Gründemann C, Zimmermann-Klemd AM, Müller A, Sehnert B, Salzer U, Klein R, Voll RE, Samstag Y, Huber R. 
    Vegan diet reduces neutrophils, monocytes and platelets related to branched-chain amino acids - A randomized, controlled trial.
    Clin Nutr – ISSN 0261-5614. 2020 Nov. 39(11):3241-3250. 
    doi: 10.1016/j.clnu.2020.02.011. 

  • Kilper A, Müller A, Huber R, Reimers N, Schütz L, Lederer AK. 
    Complementary medicine in orthopaedic and trauma surgery: a cross-sectional survey on usage and needs.
    BMJ Open – ISSN 2044-6055. 2020 Sep 6. 10(9):e037192. 
    doi: 10.1136/bmjopen-2020-037192.

  • Deutsches Ärzteblatt: Naturheilverfahren und Komplementärmedizin in der Chirurgie 

 

Complete list of publications: PubMed link