You don't. You don't worry about anything but getting well. So you eat soft foods, and if those foods happen to be little pots of cheesecake, then so be it. You're sick, I'm certainly not going to yell at you. Just get better, and then get back to work.
I'm down 2 kilo, and considering the last week was HELL (baby had/has an awful ear infection, and I was battling 102F fever all yesterday), not too shabby.
This week will be spent getting back to 100%, and then hopefully the weather will play nice and I can push baby in the pram a few miles a day.