Synthetic food supplements
I have used Enervitene and Gu-Gel with some concern what they may do to me. I can report that there were only mild repercussions. I noticed bad breath and constipation after heavy use. Not just me but also other users.
On the positive side I observed a clear energy increase. As stated before, breakfast and SAG food is not of high quality nor is it a source of quick energy. I used one substitute per hour and that powered me for that hour at speeds above 20 MPH on flat with light headwind and Solo.
I will stop using this stuff after this tour but may use it on occasion to race someone.