Why have the recommendations for vitamin d recently become a controversial topic among experts? i need a good answer is for a class discussion.

Recommendations for vitamin D is controversial because everyone shows up as low in vitamin D. One would gather that if every person no matter what age, sex, race etc is showing as deficient in vitamin D, what is wrong with the test?

1. b vitamins2. vitamin k3. vitamin d4. examples are walnuts, seeds, tofu5.  total fat, saturated fat, trans fat, cholesterol, sodium, total carbohydrate, dietary fiber, sugars, protein, vitamin a, vitamin c, calcium, and iron.6. 11257. they have to contain reliable information8. less than 10%  9. i didnt read the course so im not surehope that : p