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About me

I currently work as a post doc at the Department of Medicine (Solna), Unit of Clinical Epidemiology, Karolinska Institutet. My research focuses on how lifestyle factors affects our health. I primarily study the effects of physical activity and sedentary behaviors, diet and anthropometric measures on different aspects of health. During my thesis work, I developed and validated web-based questionnaires to assess physical activity. I also investigated how physical activity and body weight affect the risk of developing prostate cancer and the survival after a diagnosis. During my time as a post doc at Harvard T.H. Chan School of Public Health, I studied how patterns of physical activity and sedentary behaviors measured using accelerometers affect our health. Today I work with a large intervention study evaluating the use of a smartphone-app to promote physical activity among patients with diabetes type 2.    


  • Master of Science, major in nutrition, Stockholm University, 2009
  • PhD in Epidemiology, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 2015
  • Post doc at Harvard T.H. Chan School of Public Health, Nutrition department, 2015-16

Research description

My research is mainly focused on work within the fields of physical activity methodology, e-epidemiology, and cancer epidemiology.

Physical activity – Methods for measuring physical activity in epidemiological settings. I have worked with developing and validating physical activity questionnaires and used different methods including accelerometers and doubly labelled water to assess different aspects of physical activity. In my current research I focus on patterns of physical activity and sedentary time assessed with accelerometers in relation to different health outcomes and if a smartphone-app can be used to encourage patients to increase their physical activity. 

Cancer epidemiology – Lifestyle factors and the prevention of prostate cancer and survival after a cancer diagnosis. My studies include associations between lifestyle factors, including body weight, weight change and physical activity, and their relation to prostate cancer risk and survival.

E-epidemiology – Development and validation of new web-based questionnaires to assess physical activity and diet among children, teenagers and adults, and a smartphone-app for physical activity.


Intake of vitamin C, vitamin E, selenium, zinc and polyunsaturated fatty acids and upper respiratory tract infection-a prospective cohort study
Raposo Se, Fondell E, Ström P, Bälter O, Bonn Se, Nyrén O, et al
European journal of clinical nutrition 2017;71(4):450-457

Validation of an Online Food Frequency Questionnaire against Doubly Labelled Water and 24 h Dietary Recalls in Pre-School Children
Delisle Nyström C, Henriksson H, Alexandrou C, Bergström A, Bonn S, Bälter K, et al
Nutrients 2017;9(1):-

Body mass index in relation to serum prostate-specific antigen levels and prostate cancer risk
Bonn Se, Sjölander A, Tillander A, Wiklund F, Grönberg H, Bälter K
International journal of cancer 2016;139(1):50-7

Correlates of Leisure Time Physical Inactivity in a Scandinavian Population: A Basis for Interventions
Bonn Se, Alfredsson L, Saevarsdottir S, Schelin Me
Journal of physical activity & health 2016;13(11):1236-1242

The roles of stress and social support in prostate cancer mortality
Jan M, Bonn Se, Sjölander A, Wiklund F, Stattin P, Holmberg E, et al
Scandinavian journal of urology 2016;50(1):47-55

A new mobile phone-based tool for assessing energy and certain food intakes in young children: a validation study
Henriksson H, Bonn Se, Bergström A, Bälter K, Bälter O, Delisle C, et al
JMIR mHealth and uHealth 2015;3(2):e38-

A Validation Study of the Web-Based Physical Activity Questionnaire Active-Q Against the GENEA Accelerometer
Bonn Se, Bergman P, Trolle Lagerros Y, Sjölander A, Bälter K
JMIR research protocols 2015;4(3):e86-

Background risk of breast cancer and the association between physical activity and mammographic density
Trinh T, Eriksson M, Darabi H, Bonn Se, Brand Js, Cuzick J, et al

Body mass index and mortality in men with prostate cancer
Cantarutti A, Bonn Se, Adami Ho, Grönberg H, Bellocco R, Bälter K
The Prostate 2015;75(11):1129-36

Physical activity and survival among men diagnosed with prostate cancer
Bonn Se, Sjölander A, Lagerros Yt, Wiklund F, Stattin P, Holmberg E, et al
Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology 2015;24(1):57-64

Body mass index and weight change in men with prostate cancer: progression and mortality
Bonn Se, Wiklund F, Sjölander A, Szulkin R, Stattin P, Holmberg E, et al
Cancer causes & control : CCC 2014;25(8):933-43

Perceived Reasons, Incentives, and Barriers to Physical Activity in Swedish Elderly Men
Sjors C, Bonn Se, Lagerros Yt, Sjolander A, Balter K

Relative validity of micronutrient and fiber intake assessed with two new interactive meal- and Web-based food frequency questionnaires
Christensen Se, Möller E, Bonn Se, Ploner A, Bälter O, Lissner L, et al
Journal of medical Internet research 2014;16(2):e59-

How valid are Web-based self-reports of weight?
Bonn Se, Trolle Lagerros Y, Bälter K
Journal of medical Internet research 2013;15(4):e52-

Two new meal- and web-based interactive food frequency questionnaires: validation of energy and macronutrient intake
Christensen Se, Möller E, Bonn Se, Ploner A, Wright A, Sjölander A, et al
Journal of medical Internet research 2013;15(6):e109-

Active-Q: validation of the web-based physical activity questionnaire using doubly labeled water
Bonn Se, Trolle Lagerros Y, Christensen Se, Möller E, Wright A, Sjölander A, et al
Journal of medical Internet research 2012;14(1):e29-

Feasibility of a novel web-based physical activity questionnaire for young children
Bonn Se, Surkan Pj, Lagerros Yt, Bälter K
Pediatric reports 2012;4(4):e37-

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