Our bodies do the exact same thing when they are running low on vital nutrients. They don't send a text message saying, "Hey, we are running low on Vitamin B12 down here!" Instead, they drop subtle, sometimes bizarre hints that we easily mistake for just "getting older" or "having a stressful week." Here is a look at some of the most common, sneaky nutrient deficiencies, how your body flags them, and how to get your dashboard lights back to normal.