Written by Luc Geeraert and the CAM-Cancer Consortium.
Updated January 20, 2017

Ornish diet and lifestyle modification programme

Is it safe ?

For safety issues regarding vitamin E and selenium, see the respective summaries [selenium, vitamin E]. As to vitamin C, oral doses up to 2 g per day are generally considered safe and well-tolerated. The US Institute of Medicine defined the tolerable upper intake level, i.e., the highest level of daily nutrient intake that is likely to pose no risk of adverse health effects in almost all individuals at 2 g per day, based on the possibility of osmotic diarrhoea and gastrointestinal disturbances above this level 20.

Adverse events

No adverse effects have been reported in the above-cited studies. Other data are not available.


Food allergies/intolerance to soy, soy products, and fish oils.


No interactions have been reported in pilot studies and randomized clinical trials.


No warnings have been reported in the literature.


Luc Geeraert, CAM-Cancer Consortium. Ornish diet and lifestyle modification programme [online document]. http://cam-cancer.org/The-Summaries/Dietary-approaches/Ornish-diet-and-lifestyle-modification-programme. January 20, 2017.

Document history

Most recent update and revision in January 2017 by Luc Geeraert.

Summary assessed as up to date in September 2013 by Barbara Wider.
Update and revision in November 2012 by Luc Geeraert.
Summary first published in September 2011, authored by Luc Geeraert. 


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  20. Institute of Medicine. Food and Nutrition Board. Dietary Reference Intakes: Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington, DC: National Academy Press, 2000.
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