Regular use of systemic steroids, oral or injectable
Regular daily intake of ≥ 2 alcoholic drinks
Infrequent (\< 3/week) or excessive (\> 3/d) number of regular bowel movements
Gain or loss of ≥ 5% of body weight in the last 6 months
Pregnancy
Strict vegetarians
No dietary supplements, including those containing any vitamins, minerals, herbs, plant concentrates (including garlic, gingko, St. John's wort) homeopathic remedies, probiotics, or fish oil (including cod liver oil), for one month prior to study admission
