After a short lapse in a manic Summer schedule I did a quick research search. A recent article by Gong et al. (Gong, C. & Liu, W. Chin. J. Integr. Med. (2018). https://doi.org/10.1007/s11655-018-2570-9) caught my eye - I usually find that once anyone starts acupuncture treatment they become more intrigued by the concepts behind it. To begin with it usually seems a little strange and confusing (all those channels/meridians and organs and the endless questions...). Once you look into it more, however, it all starts to make sense.
Unfortunately, acupuncture research (and there is a huge amount if you look for it, including pretty detailed science) is not that well publicised. This article is well worth reading for the growing connections being made between western science and Traditional Chinese Medicine. Remarkably (or not, depending of how you look at it) there are still new 'organs' of the body being discovered in the West, including re-categorising of the body's connective-tissue system. In 2018, a tissue analysis paved the way for the interstitium to be considered as the 80th organ of the body. The interstitium is a thin layer of connective tissue throughout the body, including lining the digestive tract, the lungs, and even blood vessels. It contains a variety of cells along with the fluid lymph, therefore it also plays a role in the body's defences. Interstitium is part of the fascia system, which is thought to help explain the meridian system in acupuncture.
If you want a closer look, here's the link: https://link.springer.com/article/10.1007/s11655-018-2570-9