Some suggestions for snacks...Most of these can be made in advance...then they are an easy to just grab snack.

Chicken wings with blue cheese dip
Cheese and celery
pork rinds
hard boiled eggs
can of tuna or salmon with lots a mayo
sardines
deep fried chicken gizzards..yum...one of my favs...altho I know lots of people don't like them...my kids get grossed out!..lol
BLT salad with cheese and ranch dressing

Hope these help you.

I don't know about the body fat scales, but I have heard they are not very reliable.