But although the language and meaning of flowers have their roots in the ancient past, they've evolved somewhat over the years. The first rule of giving flowers to your spouse is to know and give them what they personally like. That's more important than anything else.
How much vitamin D should adults take? According to the National Institutes of Health (NIH), the daily Adequate Intake (AI) for adults is 5 mcg (200 IU) daily for males, female, and pregnant/lactating women under the age of 50. People 50 to 70 years old should get 10 mcg daily (400 IU) daily, and those over 70 should get 15 mcg daily (600 IU). Based on recent research, Dr. Weil recommends 2,000 IU of vitamin D per day. Look for supplements that provide D3 (cholecalciferol) rather than D2 (ergocalciferol).
This is partly because people spend more time indoors, wear sunblock outside and eat a Western diet low in good sources of this vitamin. The Reference Daily Intake (RDI) is 400 IU of vitamin D per day from foods, but many health organizations recommend getting 600 IU (3). If you donât get enough sunlight, it should probably be closer to 1,000 IU per day (4). Here are 9 healthy foods that are high in vitamin D.