I don't know about sugar, but that is true regarding natural fat versus hydrogenated oils.
That is really interesting--I have never heard that before. Perhaps a good reason to use real butter when cooking?
On the other hand,
Perrigue et al (2006) compared the effects of isocaloric servings of colas sweetened HFCS 45, HFCS 55, sucrose, and aspartame on satiety and subsequent energy intake. They found that all of the drinks with caloric sweeteners produced similar satiety responses,
From
http://en.wikipedia.org/wiki/High_fructose_corn_syrup, but it does quote a real article: Perrigue et al. in
Proceedings from Experimental Biology, 2006. (Not a great citation, thanks wiki), as well as another by Melanson, also in
Proc. Exp. Biol., 2006.
So, I guess what my friend said is probably not true.
Also, thanks for the welcome, Antibubba!