I have been “sick” the last few weeks with a mysterious illness that has caused me to be lightheaded and even pass out. Whenever I get sick like this I think, “What has changed?” Well, one thing that changed is that when I returned home in late January I started using Truvia (Stevia) instead of Equal or Splenda. Sure enough, I stopped taking Truvia and I was fine, and then I tried it again yesterday and became lightheaded in a few hours, and nearly passed out again. I was able to check my blood pressure and heart rate during this latest episode, and my BP was fine (120/72), but my heart rate was 87 or higher. After reading other accounts of people saying that Truvia causes lightheadness and fainting, I hope I have found my culprit.