Many people are starting to feel that their bodies are no longer responding the same way they used to, even though they are taking care of themselves the same way, controlling their diet the same way, and exercising as before.
Stress isn't just a mental issue; restore from within with mindfulness and the Threefold Training. Living in a big city, many are familiar with this feeling—waking up feeling like they haven't rested at all.
Heavy metal testing is something close to home that shouldn't be overlooked, especially if you "feel something different" even though your basic test results are normal.