Don't put pathogenic contaminants in food keep food natural
The answer for this question would be all of the above
By slowly introducing the changes and not implementing them all at once.
Vitamin D is a commonly underconsumed nutrient (also Vitamin A, Vitamin E, folate, Vitamin C, calcium etc). A longterm consequence of poor diet include an increased risk of cardiovascular disease, osteoporosis and cancer.
Stimulants increase heart rate, increased blood pressure, constrict blood vessels, increased blood glucose
