Welcome to 3FC, LP! Congrats on the loss so far, 16lbs is no mean feat. As for your plateau, there's a number of things to consider. First, what's your sodium level like? Too much sodium can retain water in your body, making the scale stall even though you're not overeating. Secondly, and in relation to the first point, make sure you're drinking enough water. 1.5 litres per day is the recommended amount, and it will also help flush out your system, prevent dehydration and water retention (combined with watching your sodium intake) and aid greatly in metabolising body fat.
Another possibility, make sure that you eat regularly throughout the day. I would recommend eating something every four hours. It just keeps your metabolism ticking. Try also not to eat after 7 or 8pm.
If you have a high carb intake and suspect that might have something to do with it, try switching to wholegrain 'brown' carbs if you haven't already. They take longer to digest, are more nutritious, full of fibre and a lower glycaemic index.
Other than that, keep plugging away at your fitness routine and watch your calories, and you should see that scale move in no time. Do you track your calories? If not, have a go, it's really useful for keeping yourself accountable and on track. You can use My Fitness Pal to do it for free:
http://www.myfitnesspal.com/
Good luck!
