I have used probiotics and digestive enzymes for 20 years. I have found that, in addition to Lecithin and Chromium Picolinate, probiotics assist in keeping the blood sugar normalized. They are also VERY important for the immune system. There are at least 13 strains of bacteria that are essential for preventing inflammatory illnesses and the health of our intestinal system which is the seat of our immune systems. These so-called 'good bacteria' crowd out the nasty ones.
Here's a link to a great article in the Atlanta Black Star on probiotics and prevention of Obesity & Diabetes.:
"Natural Healing: Probiotics Can Reduce Diabetes and Obesity"