Researchers from Hawaiian and Californian Universities studied the diets of over 190,000 people in the US and found that higher intakes of calcium were associated with lower rates of colorectal cancer. For men, higher intakes of vitamin D were also associated with lower rates.
Colorectal cancer is one of the most common cancers in New Zealand for both men and women in terms of both incidence and mortality.
The main source of calcium in our diets is milk and dairy products, although soy milk, tofu and canned sardines are also good sources.
Vitamin D is made by our skin if we have sun exposure; if not it must be consumed in foods like fatty fish and eggs; some milk is also fortified with vitamin D.
http://www.healthyfood.co.nz/articles/searchcategories?vocabulary_name=hfm.categories.foodandnutrients&catalog_index=foodandnutrients_categories&vocabulary_term=calcium
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