Some metabolic processes failed, that's why!
Just like when a plant or your pet gets sick, you find out what is going wrong with their bodies, environment around them. If a plant's leaves start to turn brown, fall off you start to wonder: is it getting enough sun? Is it getting enough water? Is the soil nutrient-rich to allow growth? You have to remember we share most our DNA with plants and our gut microbiome looks much like a tree root branched out. For a variety of reasons many of us have hidden absorption problems that prohibit absorption even if we think we are eating some magical healthy food. It's about consistency, dosage, quality, quantity and the same goes for what you watch on television or who you socialize with at work or elsewhere. Everything is connected. Trying to correct those absorption problems are some of the first steps, but sometimes not always possible in our toxin-filled world that block absorption such as exposure to byproducts in the drinking water all the way to what we use on our hair that we think is harmless.