Re: Stevia - sugar alternative.

 I guess this is why we see people who are overweight, not losing weight, if they eat and drink a lot of food containing aspartame. 

That is part of it.  The other part is that aspartame increases blood sugar levels, which in turn causes insulin spikes, which in turn stimulates the production of fat deposits.  So the use of aspartame as a "diet" aid is very misleading.  Same for sucralose (Splenda), which also increases blood sugar levels.