Regarding the vitamin issue...
I have no idea what sparkpeople has to say about it, but having had gastric bypass surgery, one of the things that the drs. said was imperative, was to take our multi vitamin! One of the most important aspects to a multi vitamin is how quickly it dissolves. If it doesn't dissolve within 30 minutes, you are not getting the full benefit of the vitamin. There is a test you can take to find out how long it takes your vitamin to dissolve. (my daughter got superior at state science fair for this project).
Take one cup of water, with one teaspoon of cider vinegar. (Mimics stomach acid) Drop the vitamin in it and watch. If the vitamin does not completely dissolve within 30 minutes, it is not dissolving in your system either. She tested 14 different brands with very different results. There were three vitamins that never broke down and just to see, we left them in for 3 days!(still solid after 3 days) They were among the more expensive vitamins too. There were only 4 that passed the 30 minute test. The one that stood out above all others was the Kroger Complete brand. It dissolved in 10 minutes flat! (that is what I take and have had great results from them). The other ones were Centrum A to Z, (dissolved in 20 minutes), CVS brand and Bayer One-a-Day (dissolved in 30 minutes). The 3 brands that never ever broke down were Walgreens Daily, GNC Women's Ultra Mega, and Vitamin World Time Release Mega for Women. That was several years ago, so the formula's may have changed and maybe they are better now, but the only way to know for sure is to do your own test.
Hope this helps!
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