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To Listmembers, A study published recently, in the news today, points up a concern I have for people with PD. In the pilot study I completed last year, very few people ingested even the current RDA for vitamin D (5 mcg). Recommendations for vitamin D for adults over age 50 are now double the RDA -- 10 mcg; and this amount is being debated and may be raised in future, as the study suggests. In the study just published, study subjects were found to have low serum levels of vitamin D. This is of special concern to people with PD, as some may fall, and falling increases risk for bone fracture if the bones are weakened. I'd like to take this opportunity to remind everyone that calcium cannot be absorbed without sufficient vitamin D. An hour or so in the sunlight weekly, exposing the face and arms, may provide enough. Foods rich in D may be a problem for people with PD, as they are mostly high in protein -- eggs, fortified milk, as well as fortified margarine. Fortified milk is the most common source in the U.S., and many people with PD find that milk halts levodopa absorption. If regular exposure to sunlight is not possible, I encourage you to use fortified milk alternatives, fortified cereals, or speak with your physician about a supplement. With regard to the article, the amount of 800 IUs mentioned is not necessarily universally recommended for all older adults. You should speak with your physician to determine the right amount for you. To access the news article online: http://www.intelihealth.com/news?174580 My best regards, Kathrynne -- Kathrynne Holden, MS, RD "Nutrition you can live with!" Medical nutrition therapy http://www.nutritionucanlivewith.com/ Tel: 970-493-6532 // Fax: 970-493-6538