Right, that's normal; people who affected at all are generally affected dramatically. So it can be self-tested with a challenge test; check your BP, eat something salty, test it again. If it is close to normal, then reducing it probably will not improve outcomes. If it spikes, then reducing it probably will improve outcomes.
It is easy to convince people that different people have different needs, but it is harder to convince people to use evidence to decide what their personal needs are. People think about having different needs and instantly turn to their subjective feelings, which isn't what the lesson is at all. There is a tendency to stay all the way to one side or the other of reality.