1. Reclast is not poison.
2. Osteoporosis can be inherited, but you can also get it from other factors.
3. You could have osteoporosis that requires treatment, and not even know it. The first symptom will be when you actually fracture something. Until then, you may very well feel "extremely healthy."

Do yourself a favor and at least get a DEXA scan so that you know what you're dealing with, if anything. Better for you to have as much information as possible. If all anybody needed was diet and exercise, hardly anyone would have osteoporosis.