I want to be fine at 50..

Options
Hello everyone. I'm hoping to get all the help and motivation I need. I just had the gastric sleeve done back in Nov 2014 and I'm on my way.. I'm working from home so when I workout I like to do it outside even though I have a treadmill. Per my Dr. I should be on a 600 cal diet.. My problem is after dinner.. I need to find some low calorie snacks.