The FDA is "basically" a totally SELF-regulating thing...they could receive MILLIONS of emails and letters, and easily choose to ignore them. The ONLY "power" they have to worry about is CONGRESS!
Without sending letters to your sentators & representatives, the FDA could 'walk away' on this one, no matter HOW many letters they receive!
Remember, even though ample evidence (MORE than ample evidence) has been provided to the FDA about the insidious dangers of Aspartame/Nutrasweet, and millions of voices have 'spoken loudly', the only thing the FDA did? Published an edict saying they REFUSE to even CONSIDER any more information on the dangers of Apsartame, so please stop sending it to us...case closed.