“[People in these groups] should talk with their doctors about being tested for vitamin D blood levels and taking a vitamin D supplement,” she recommended.
The doctor noted that people need only small to moderate amounts of vitamin D for good health, as the vitamin’s metabolism is “tightly regulated” in the body.
“More is not necessarily better, and very high doses — such as more than 10,000 IU/d — may be associated with high blood or urine calcium levels and toxicity,” she cautioned.
Manson emphasized that taking a supplement is not a substitute for a nutritious diet and healthy lifestyle.
“Although it’s much easier to pop a pill than to be physically active outdoors and eat healthfully, these lifestyle factors will do more to keep you healthy and lower your risk of cardiovascular disease, cancer, type 2 diabetes and other chronic diseases of aging,” she said.
“More is not necessarily better.”
Going out for a 15-minute walk a few times a week at midday will typically provide enough sunlight exposure for the skin to synthesize vitamin D, Manson added.
“Even more important for your health would be to exercise outdoors, such as brisk walking, jogging or playing sports.”
