I wind up cooking 2 meals. DH is almost underweight. I attempted to change my lifestyle a few years ago (it wasn't such as permanent as I wanted) and lost ~50 pounds cooking separate meals for dh. He lost 15 pounds and the doctor was checking him for medical problems.
Just being in the same house with someone losing weight caused his weight to magically go down.
So not fair. All he did was stop eating icecream for his midday snack so I wouldn't be tempted to eat just a spoonful everyonce in awhile. You know how that just a spoonful tends to be a little more. You take a little around the edge and then you have a hump so you have to smooth that out and then you get an odd shape and you have to fix that-by eating it of course.
I slowly put all my weight back on, it's so hard to make permanant changes.