Ionic Strontium drops"

.....do you have any idea why that would be whether diet or otherwise?  From research strontium does have bone building qualities but maybe absorption differs in people.

Strontium and calcium doses have to be taken at different times.  Otherwise the strontium will not be absorbed as the body prefers calcium - naturally enough as calcium is also essential for body precesses other than bone building.

darn typo.  processes

Yes, I did take them separately; I use Garden of Life Grow Bone system or New Chapter Calcium with separate strontium.

My diet is pretty pristine - all organic, lots of raw, juicing, wheat grass, very alkaline. My stress hormones went way up before the second testing, so I am considering whether that may have played a role. I was actually vegan for several years prior to the test that was better. But I felt like I needed to add meat back in so for the next years prior to second testing I was eating a small amount of quality meat/eggs every day. That should be a positive, though. However, I stopped juicing and drinking wheat grass daily during that second period, so I am also thinking that my level of acicity may have gone up. My current spine score is -4.0. 

You know there's a lot of controversy about so-called alkaline or acidic diets.  Our body is really good at maintaining ph, and if it goes out of whack it means you're deathly ill.  I think we just need to avoid junk food (sugar, trans fats), too much animal products, and too much food, period .

I agree totally with you re acid / alkali body balance. Also, a good balanced diet, gives our body a chance to repair itself.

...just read that the hormone cortisol causes bone loss.   Stress and sleep deprivation can elevate cortisol levels leading to bone loss so this quite possibly could be the answer to your bone loss at that timedespite taking strontium born with a good nutritional diet.