Scientific facts about a circumstance

I have heard that the weight of our bodies is a neutral circumstance. It is merely a number. I get a little conflicted with this because I want to say that a certain range of numbers of weight for a certain height are factually proven to be healthy or not for our bodies. There are studies that prove these facts. So couldn’t that be part of the circumstance sometimes? For example “I am at an unhealthy weight X number of pounds”. It isn’t just our thoughts that create this but it is actually the facts. Can you help me make sense of this?