Better breathing is one of the FIRST things I noticed when on low-carb! My nose use to get stuffy and it felt like my body was not getting enough oxygen, UNTILL I started on Atkin's. The only times I get stuffy now are when I eat TOO many eggs, or when I eat the same things over and over. Otherwise, I think one of the great benefits to Atkin's is unbelievable air flow. I guess it was all because the sugar was making my blood sticky or something. Who knows???