Aychamo BanBan
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In America it's rare for an otherwise healthy (ie, not an alcoholic, someone on chronic antibiotic use, chemotherapy, or just retarded) person to have a vitamin deficiency. And if you have a diagnosed deficiency, then by all means supplement with that vitamin. Yes vitamins are vital, but a reasonable diet will still get you more than enough. We all need to remember that they're active compounds and we don't know every role vitamins play. They aren't magical entities that can elevate your immune system to new heights (I know you didn't say this, but some think this.) Simple consider vitamin E. Supplementing with E significantly increases a males risk of prostate cancer. Some increase risk of cardiovascular disease, stroke, and one large study found multivitamins increased mortality in elderly females. Etc.Eating is not just about energy though, it's also about raw material. Some we need in bulk, but some we need in small quantities like vitamins, stuff we can't synthesize on our own (that's actually the definition of a vitamin oddly enough). Some are pretty frail, meaning freezing/unfreezing, conservation treatment, light exposure or simply time degrades them, making the food less healthy.