11.   Fenfluramine and dexfenfluramine raise serotonin levels in the brain and seem to reduce cravings for fattening foods.

12.   Fish oil appears to boost serotonin levels in the brain, stabilizing mood in a way similar to drugs such as Prozac or Zoloft, the researchers said.

13.   For some people, cutting back on food lowers serotonin levels and attendant anxiety.

14.   For anorexics, these drugs are effective in preventing relapse but only after patients have returned to a normal weight and, presumably, more normal serotonin levels.

15.   Further research, Kish said, may show whether supplementing serotonin levels might help those seeking to go through withdrawal.

16.   Further research may show whether supplementing serotonin levels could help addicts seeking to go through withdrawal.

17.   In addition to causing mood swings, some researchers believe low serotonin levels also cause PMS sufferers to crave and consume large quantities of carbohydrate-rich foods.

18.   Lowered serotonin levels have been associated in some studies with suicide and other forms of violence.

19.   Once the tryptophan raises serotonin levels, a natural sedative effect may set in, the researchers said.

20.   One drug, called Meridia, from Knoll Pharmaceutical Co., is expected to undergo further FDA scrutiny since it works like Redux in raising serotonin levels.