Hi Robin,
For cold patients, formulas that contain Ephedra (Ma Huang) still work. They should be avoided in hot patients.
Most overweight patients have a degree of metabolic syndrome, IMO. So processed diets, especially those that are grain-based, will never provide optimal results in weight loss, given how much they aggravate metabolic syndrome. Home-cooked or raw is the only way I know of to get pounds off animals, and is often all that is needed.
Of the formulas that promote insulin sensitivity and counter metabolic syndrome, Si Miao San has perhaps the strongest activity. San Ren Tang has milder effects in this arena, more suited for patients that are only slightly hot. Between the three, cold, hot, and in-between, you have most patients covered.
Steve