I use many spices to add flavor without salt or added fat. I often season meat or fish with tumeric, because I like the taste.
Wikipedia suggests some potential health benefits of tumeric (and cumin):
Turmeric is currently being investigated for possible benefits in Alzheimer’s disease, cancer, arthritis, and other clinical disorders.
In the latter half of the 20th century, curcumin was identified as responsible for most of the biological effects of turmeric. According to a 2005 article in the Wall Street Journal, research activity into curcumin and turmeric is increasing, with supplement sales increased 35% from 2004. The U.S. National Institutes of Health currently has registered 19 clinical trials underway to study use of dietary turmeric and curcumin for a variety of clinical disorders (dated February 2010).