Teach kids to not put hands in mouth and air nibble the fake food. Also, what is SICK to you? Boogie nose (not to me)? Coughing from boogies draining(not me)? Fever (hell yes to me, or even warm or looking sick in the eyes, usually lack of energy compared to normal)? It is about building up that immune system but also not having them appear to struggle all winter with illnesses. My kids get boogies on and off through the winter. I taught them to use saline nasal mist, drink LOTs of water, apply vicks, suck on cough drops. My oldest is 5 and has only had 2 fevers (once during teething), my youngest is 2. 5 and has also had 2 fevers ever. We go out A LOT, play with other kids. if I see a kid that appears sickly. I just remind the girls not to touch too much stuff or put hands in mouth. We DONT use hand sanitizer and we dont over wash hands either