I just found this post.

Certainly depression can cause weight loss. But 7 lbs a month is a substantial
amount. For a male, this can lead to loss of the blood carrier proteins that carry hormones around your body. I saw a study in males over 40, who lose their
testosterone binding capability and hence secondary sexual characteristics.

Here is a link with a list of possible causes:
http://www.nlm.nih.gov/medlineplus/e...cle/003107.htm

If you are already lean, then you must be losing muscle mass. This is NOT GOOD.
Cardiac cachexia is more common than people think. And today I see younger and younger patients who have heart failure. Sometimes in their early 40's.
http://www.webmd.com/hw/health_guide_atoz/tx4124abc.asp

Also, hidden malabsorption syndromes, like gluten intolerance, can lead to
a loss of nutrients due to failure in absorption. This can be slow, and have few if any symptoms for some people. So hence people may be eating well, and not absorbing much from their food, due to villi damage in the small intestine.
I went back to some of your earlier posts here, and found references to chronic pain, and abdominal pain. So I would seriously suggest you visit our Gluten/Celiac forum here. There may be answers for you there. If you are taking opiates long term for pain, these suppress the hypothalamus pituitary axis and lead to hormone changes. This may be significant for you too.

Once you start to metabolize your muscle mass, you will eventually lose cardiac muscle as well. So I think you should carefully consider a metabolic, medical issue for your weight loss, other than depression (which may be there as a consequence not as a cause.)

I would not trivialize this symptom, and would continue to find an answer for it.

We have a member DogtorJ who is a veternarian. He had severe fibro and by going gluten free (and in his case casein free too)
he turned that around. He now posts on the internet his story:
www.dogtorj.com