Does vitamin D lower the risk of developing cancer?
New research suggests that all forms of cancer are less likely to develop in people with the highest level of vitamin D in the blood, compared to those with the lowest (http://www.bmj.com/content/360/bmj.k671). Vitamin D is a potent compound that has anti-cancer properties. Specially, high vitamin D levels have the strongest effect against preventing liver cancer, but also reduce the risk of colorectal and lung cancers. These results suggest that vitamin D may have beneficial effects in cancer prevention.
Vitamin D must come from food, as the body can’t make it. While it is tempting to take vitamin D supplements to prevent cancer, that action is unwise. Too much vitamin D is toxic to the body and has no additional beneficial effects with super high intakes. The most accurate way to measure how much vitamin D is in your body is the 25-hydroxy vitamin D blood test. A level of 20 nanograms/milliliter to 50 ng/mL is considered adequate for healthy people. A level less than 12 ng/mL indicates vitamin D deficiency (https://www.webmd.com/diet/guide/vitamin-d-deficiency#1 ). Fat cells absorb vitamin D out of the blood, therefore, overweight or obese people often have lower levels than normal weight individuals.
Each Nutrient meal has one-third of the daily need for vitamin D; Nutrient bars have 25%. The only way to know if you have enough vitamin D is to get a blood test. If your doctor prescribes you vitamin D in supplement form, then you need regular blood measurements until your levels become normalized.