You’re probably referring to Salacia oblonga (or S. oblonga) an herb traditionally used in Indian medicine to help control the increase in blood sugar that follows a meal. A study published in the January 2005 issue of the Journal of the American Dietetic Association found that a drink made with the herb blunts this effect and also reduces insulin levels. S. oblonga grows in India and Sri Lanka, but is not well known in the United States, and has not been widely researched.
This seems hard to do, but really it’s not if you know one secret: Replace snacking with something far more satisfying — fat. That’s right, the government is wrong to recommend a low fat diet. Fat is what makes you feel full until your next meal. Take away the fat, take away the full. Don’t go to an extreme, but do lean strongly toward a high-fat low-carb diet.