does barometric pressure affect body weight
The thing that affects people most is barometric pressure. Barometric pressure is the weight of the atmosphere that surrounds us. If you imagine the tissues surrounding the joints to be like a balloon, high barometric pressure that pushes against the body from the outside will keep tissues from expanding. But barometric pressure often drops before bad weather sets in. This lower air pressure pushes less against the body, allowing tissues to expand -- and those expanded tissues can put pressure on the joint.