One cannot gain weight if they eat fewer calories than they expend. It’s impossible. People expend at different rates, and sometimes that rate changes.
One must adjust their input to match their output.
Metabolism has a lot to do with it……it’s not always the calories…..I have always been slim and eat everything…..I detest carbonated drinks though….never have them
..l.
Oh yes you can, prednisone causes water retention, so
you can add on weight even though you’re not eating
more.
I think it may depend on other factors than just intake and caloric use.
People can have endocrine and all sorts of other problems that make them sensitive to various foods and unable to process them as others do.