Not totally untrue.
Not to discredit your professor, but s/he obviously don't know what s/he is talking about or haven't met people who suffered from it.
It's still a well-kept secret to this day that aspartamese is harmful especially when it's consumed on a daily basis. In fact, I cannot consume any amount of aspartame. If I do, I'll get abdominal pain and it is PAINFUL. There are many people out there on an annual basis who develop the same reaction to aspartame. Artificial sweeteners, like oil is of great value to the economy.
It started around a few years ago, I didn't use to consume aspartame on a daily basis till I started drinking Crystal Light. At first, nothing happened but after a few months of drinking a couple glasses a day. I started to experience abdominal pain and cramps... it didn't stop there, it got worse because I didn't know what was causing it. I started looking into what was causing these reactions, I looked up all of the food and drink products that I consume. I looked all over the Internet for information on abdominal pain caused by food and drink products. I came across some websites claiming that people had the same allergic reaction to a certain product that I drink often.
The claims seemed to be far-fetched but I gave it a shot and drank a glass of Crystal Light. Within an half hour later... it started. I didn't stop there, I went on to try different products that contained the ingredient like chewing gum, flavoured water, etc. I reacted to all of them in the same way except for the chewing gum. It was a different reaction, I had a lot of facial tics over the few days after chewing the gum stick.
Obviously, I am allergic to aspartame. But I wasn't at first, and now I cannot consume anything containing aspartame.
I know I am not the only one, there are thousands on a yearly basis who develop an allergy to it. You won't find it easy to find the information online, but it's there and I posted an image of a hard copy from 1995. This is to show you that the FDA is fully aware of this issue and yet is doing nothing.
People are being duped into thinking it's perfectly safe to consume it. Despite the number of medical professors and Snopes saying it's not true, it can be harmful to many.