It was confusing to me as well, but I kept a daily journal and checked my bp 3 to 4 times each day to arrive at a daily average.
On 8/8, when I started primal and stopped my bp meds, my bp was 133/73 and weight was was 212.
After one day of primal and no meds my bp was 131/76 and weight was was 208. Initially this was very promising.
After 35 days on primal, on 9/12, my bp was 145/85 and my weight was back to 212. At this point I reintroduced some grains. By 9/14 my bp was 149/90 and I went back on bp meds, my weight was 214.
Today my bp is 135/79, and my weight is 213, pretty much back where I started on 8/8.
I guess I was saying that primal initially gave me a 4 lb weight loss the first day, that went back to my starting weight after 35 days. Going back on grains I gained 2 lbs then lost 1 lb.
In regard to bp, the primal did not keep my bp down in the 130s where it was with the meds. It crept up to 145. I then re-introduced grains and it went to 149. The meds got it back to 135. I found that grains vs no grains made very little difference in my weight or bp.